2015 YZ250F PROBLEMS!

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3/26/2017 7:39 AM

I had a buddy who had about 12hrs on his 14 yz450 ran fine up until recently. Went about 10 laps at a local track, bike ran fine. Pulled off the track to talk to another buddy and shut the bike off. Restarted the bike after several minutes of chatting and the bike was hard to start and when it finally started it would idle fine but would bog and cut out and backfire if he gave it anything more than probable 1/4 throttle. He brought the bike to me and I hooked my tuner up to it, no codes. Went through the harness, checked throttle body and intact tract for signs of dirt, di-electric grease in the connections on the whole harness fire the bike up in the garage ran fine. Finished buttoning it back up and rolled it out side to test ride it in the field, back to running like crap but again idled fine. Hooked tuner up, this time code 13 air pressure sensor. According to the reading it was showing the correct pressure for my area, which is weird since it threw a code. Called around no one had a sensor in stock. I wish I could have remembered this thread when I was messing with his bike, I was about to pull my hair out but then I remembered how these sensors operate so I unhooked it and blew into the sensor lightly and it changed values on the tuner, took a slight vacuum on the sensor and again value changed the way it should have. Like another member mentioned earlier I decided to put the bike together enough to have the tuner on it while it was running to watch the sensor data. Most of the time it should changes in pressure corresponding with throttle openings and closings, however every so often the data would do some weird stuff, and kick the code back on. I have a 12 yz450 torn apart in my garage that is in a build thread on here and I happened to remember that I still had the throttle body sitting in a drawer on my bench. Took the sensor off of my throttle body and put it on his throttle body and bike has ran fine ever since.

Long story short just because there isn't a code doesn't mean that one of the sensors isn't acting up. It seemed like half the time the code would be in his bike and half the time it wouldn't be in there. I am not sure if there is some kind of process that eliminates a code after a certain amount of time or what but the code would disappear sometimes which had us running in circles trying to figure it out. Also in this thread it was mentioned and in another one I found for tps issues that just because you get readings from the sensor doesn't mean it is working properly much like what happened on this bike. It seems like even if the sensor works 99% of its range that 1% is enough to effect the bike. His sensor would mess up every so often and that little spot where the pressure reading changed was in a very small spot of throttle opening that was very hard to hit perfectly. The other thread I mentioned said the same thing with the tps, the reading was good everywhere that the dealer tried. But out of pure frustration they tried giving it very slight and as best they could metered throttle openings and as luck would have it at a certain throttle opening the ohms of the tps would do some weird stuff which effected the voltage of the sensor also and caused the ecu to try to compensate for that one little hiccup, problem is there was not any consistency to this reading so it was hard for the ecu to keep the bike operating properly and it also made it very had to find in the diagnosis.

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3/27/2017 12:40 PM

When my dealer repaired it the 16 sensor hadn't come in. So we have been running a 15 sensor until this weekend. Had the 16 sensor in the toolbox. Well went to ride this weekend and the bike hesitated to start. Then the 2nd moto it went to acting up. Came back to pits and it stalled right at the trailer and would not start back. Brought home put on stand would not crank.

All we did was open the 16 TPS sensor package and popped it on bike fired right up. My mechanic was shocked. I had not told him this entire story. He thought it was blown up lol I think. He put it on and kicked and it started on the 2nd kick like it supposed to....

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



3/31/2017 9:57 AM

sgrimmxdad wrote:

When my dealer repaired it the 16 sensor hadn't come in. So we have been running a 15 sensor until this weekend. Had the 16 ...more

Hi I have a 2014 yz250f that has some bogging problems that only affects one area in the rpm range, definitely thinking its a tps problem after reading this. Is the new tps very difficult to install or would it be better to just have the shop do it for more money? Not too great with all the electrical stuff, thanks

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3/31/2017 12:58 PM

sgrimmxdad wrote:

When my dealer repaired it the 16 sensor hadn't come in. So we have been running a 15 sensor until this weekend. Had the 16 ...more

shane55555 wrote:

Hi I have a 2014 yz250f that has some bogging problems that only affects one area in the rpm range, definitely thinking its a ...more

it looks like its two torx screws and one wiring connector. I'm sure you can change it. if you know how to use a multimeter then you can make sure it is set correctly as well. The manual should lay it out how to accomplish both checking it and replacing it.

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7/11/2017 2:52 AM

Sgrimmxdad wow... I cannot believe all the crap you went through to find the problem. I found this thread searching to resolve my own problem on a 2014 YZ250E2 I just purchased February 2017 as a leftover. Two weeks ago I had my feet planted on my pegs going through a fast corner and out of left field I get this bog, pop, and then braaap which made my rear tire just spin out and slam me to the ground breaking my ribs. At that point I didn't really think anything of the bog, pop, brappp, I was in pain and it was time to go home. I parked the bike in the garage until I could move again. There was a good amount of water and mud at certain sections that made a big splash.
Anyways I decided to pull out the bike the other day and go take a ride. I go out to the farmers house (he's really not a farmer I just bust his balls) and start my bike and what do you know, everything you and others have described started happening. My bike has only 7.2 hours on it. I went over the bike at the track, tore it apart several times trying to figure out what the heck happened. I do have a motorcycle tech background. I have the two stroke and know part numbers are different between the two bikes but started looking at oem part numbers and noticed that they changed the o ring and a screw to the tps on the two stroke also. I noticed other posts on this thread mentioning o ring changes n stuff. anyways thanks for all the input everyone. BTW Sgrimmxdad did you ever make a YouTube video or anything? It's 5 am here in PA and well I am about to go out and do some multi metering just to make sure so I don't make an ass out of myself with Yamaha. Honestly that TPS on my carb is the only thing I did not check...

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7/11/2017 3:56 AM

kik250 wrote:

Sgrimmxdad wow... I cannot believe all the crap you went through to find the problem. I found this thread searching to resolve ...more

No I didn't make a video, probably should have. Still have the bike and we are over 150hrs now and since replacing the TPS no problems. I have said it many times and will always say yamaha should have put out a tech bulletin at the minimum and a recall at best IMO.... I still get a few pms from time to time from members that don't post but have had the same problem....

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



7/11/2017 6:17 AM

I bought a brand new 14' it was always hard to start ... and would seriously have a lean popping when WFO dumb ass dealer tried to tell me it was the stock pipe ... causing it to pop because it was " performance" anyways i sold the bike and i will be carrying my ass to brewer cycles in NC , instead of Commonwealth Power sports in virginia

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2018 crf 250r

11/11/2017 2:09 PM
Edited Date/Time: 11/11/2017 11:59 PM

Hi guys. I've just picked up a 2014 YZ250F and it's been suffering from the issues in this thread. It would run fine for about 20 minutes then develop a low rpm misfire. If you gave it a good handful of throttle it ran fine, but out of the bends it was becoming a pain.
I bought a Yamaha FI code reader and it had a code for the air temp sensor, so I replaced it but it made no difference. Then I changed the coolant temp and intake air pressure, still no joy.
I proved the fuel pump was giving out the correct 47psi and replaced the spark plug as a matter of course.
As I was clutching at straws I decided to take it for a ride to see if I could replicate the fault conditions, and sure enough after 20 minutes the misfire returned.
Then I got lucky. I took the fuel cap off and the misfire disappeared. I put it back on and the misfire returned. I gave the fuel cap a shake to see if I could hear the ball bearings inside rattling, I couldn't so the fuel pump must have been pulling a vacuum. I shook it harder and the bearings came loose, put the cap back on and it ran fine so I went straight home and ordered a new one.
It arrives Thursday so I'll report back as it could be the best £45 ive spent on it.

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4/13/2018 7:26 PM

Hey guys I have a used 2014 Yz250f and it’s having the same bogging issues when throttle is applied, I’m going to change the tps sensor and see what happens! Not to mention problem started after I dumped 1k into the suspension (all new parts and valves) shimmed or cut engine valves or something come up to 500, now it’s bogging out and cutting off after 2 laps! And feels like I’m loosing compression (way to easy to kick) after I change oil it feels decent I guess? Man I have a lemon but plan to make lemon aid Because some people can’t afford to have a glass for the lemon aid...

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4/17/2018 6:41 AM

Man you guys got me all worried about my bike now a 14 450. Hope mine is ok. Hope you guys figure out your issues.

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5/1/2018 4:50 PM
Edited Date/Time: 5/1/2018 4:51 PM

sgrimmxdad wrote:

1SL-85885-01-00 is the NEW #
replaces part #
1SL-85885-00-00 is the one that came on the bike!

Did the 1SL85885-01-00 end up being the fix? I seen you later posted replacing with the 2016? I’m having the same issue. Bought a used 2015 250f and ate the bars 20 mins after riding.

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5/2/2018 5:11 AM

sgrimmxdad wrote:

1SL-85885-01-00 is the NEW #
replaces part #
1SL-85885-00-00 is the one that came on the bike!

RC7 wrote:

Did the 1SL85885-01-00 end up being the fix? I seen you later posted replacing with the 2016? I’m having the same issue. ...more

No, we haven't had any problems with our 16 so far. The new part number did fix the 15!!!

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



5/2/2018 6:18 AM

Thank you sir. I will purchase the 1SL-85885-01-00 sensor right away!

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5/3/2018 10:53 PM

Hate to re-vice this thread but I have a 2014-15 yz250f that I built with 12.5 hours on entire new engine running a crankworks crank and big bore 270cc piston and vortex ecu, I have several parts in stock and will test back to back, but I’m getting a bog and sputter and pop that is completely inconsistent during my moto after 8-10 minutes of riding hard.


I’m a a-class racer that does a-class maintenance, I have a ton of Yamaha parts in stock including s new yz450f throttle body and ecu, stators, iAT sensor, coil, and all kinds of stuff, I also have a new fuel tank in stock, my original plan was to use a 450 harness and throttle body?

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5/11/2018 11:45 PM

So I put on the new sensor and thought everything was great. 10 minutes later, nothing had changed.... still cutting out...

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5/12/2018 1:36 AM

RC7 wrote:

So I put on the new sensor and thought everything was great. 10 minutes later, nothing had changed.... still cutting out...

So sorry to hear that. Have you checked to make sure the spark plug cap is tight, they will come loose. The only other things I can think of, that was suggested to me during my quest, is to go over your wiring harness and inspect each wire and connection. Put die electric grease in all the connectors. I did put a new wiring harness on during the chase but that didn't fix mine either. Finally stators caused some issues these years, I did replace ours but it did nothing to fix the problem, only the new TPS fixed it.

Good luck and please post if you find the problem.

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



5/19/2018 12:12 PM

Finally got mine sorted. Wish I'd gone straight to the TPS as that's the only thing that fixed it. Changed every other sensor before I tried it.

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10/20/2018 10:19 AM

Yes, looks like you got it all. Again though, I don't think the TPS caused a no spark issue. Have you repacked all the connections with die electric grease and tried to start it again?

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



10/20/2018 7:55 PM
Edited Date/Time: 10/20/2018 8:00 PM

Shit starting writing this before you made your post with the new bike, good luck! never mind

Did you replace everything electrical with new parts or used parts?
When you rebuilt the motor did you also do the head, I know you said entire but just double checking?
I'm having similar electrical woes with a yz450f, when my capacitor failed it would take at least 7 constant kicks before I would get spark and it was in spec Ohm wise which is the odd thing but that fixed the issue when replaced. I have had a bad stator once on a different bike that would just die on you when it got hot. Like you said it would start right away cold but once it warmed up it would just cut out and die then be a bitch to start again unless you let it cool down. No visual damage, swapped it and fixed the issue.

I have my eyes on a 16 and YZ250f in hopes they aren't as finicky electrical wise but I'm still scared since they are basically the same and thinking of finally joining the orange bandwagon as the safe route!

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8/4/2019 7:36 PM

RC7 wrote:

So I put on the new sensor and thought everything was great. 10 minutes later, nothing had changed.... still cutting out...

sgrimmxdad wrote:

So sorry to hear that. Have you checked to make sure the spark plug cap is tight, they will come loose. The only other things ...more

I just bought a 2016yz250f with 1 hour on it (literally) for 4K.... greasing the electrics will prevent these funny sensor issues or are these issues mainly a concern for the 14-15 models? Also, any issues with the 2016s? Thanks guy, sorta nervous as I was told the bike was a 2017, and the hype and pristine ness of the bike had me glance over the year. Not sure if the guy (rich older guy, stupid money) just didn’t know or purposely lied... but I have a 2016 yz250f. Anything I should be aware of? Thanks.

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8/5/2019 3:30 AM

The 16 has the new TPS, so you are good there! Our 16 has been a great bike, no unusual problems at all. There were very minor differences between the 16 & 17, mainly the motor mounts.... So a slight handling advantage is all the 17 had as I understand it!

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



8/5/2019 3:57 AM

RC7 wrote:

So I put on the new sensor and thought everything was great. 10 minutes later, nothing had changed.... still cutting out...

sgrimmxdad wrote:

So sorry to hear that. Have you checked to make sure the spark plug cap is tight, they will come loose. The only other things ...more

MotoMo165 wrote:

I just bought a 2016yz250f with 1 hour on it (literally) for 4K.... greasing the electrics will prevent these funny sensor ...more

I gave up on the electrical problems with my 450 and sold it and just bought a used 15 250fx and the guy had alot of random electrical problems so while it was in the shop he bought a 18 yz250f but last thing they did at the shop to his 15 was dielectric grease all the connections and I was scared buying it but so far it hasn't given me one issue so kind of wish I did that to the 450 before unloading it.

I replaced the kill switch on the 250 from a fall that broke it somehow and it just looked like vaseline in the connection. I believe the grease is supposed to be petroleum based and so thinking Vaseline would be perfect but I have read of some issues with certain brands of dielectric grease so now I'm wondering what brand to use???

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8/5/2019 4:05 AM

Thanks for the replie guys. I’ll see about the dielectric grease before taking her out this weekend!

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8/16/2019 4:28 PM

I didn’t dielectric grease the rectifier/regulator. I have a 2016 yz250f, should I be concerned?

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8/17/2019 3:15 AM

MotoMo165 wrote:

I didn’t dielectric grease the rectifier/regulator. I have a 2016 yz250f, should I be concerned?

Should be good but the dielectric grease process is something that needs to be done at least once a year I'd say, especially if you use a pressure washer!

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2020 YZ450F
2018 KTM 450SXF FE
2016 YZ250F 2008 CRF450R
2015 YZ250F 2008 CRF250R
2001 CR250R
2010 YZ250 2012 CRF150R
2009 YZ125 2010 KX109.5
SSR Motorsports Dealer YCF Motorcycles
TAGMX Suspension & Graphics! www.tagmxsuspension.com https://www.liquidskinzdesign.com/



8/17/2019 3:56 AM

MotoMo165 wrote:

I didn’t dielectric grease the rectifier/regulator. I have a 2016 yz250f, should I be concerned?

sgrimmxdad wrote:

Should be good but the dielectric grease process is something that needs to be done at least once a year I'd say, especially ...more

My bike has all connections even the kill switch greased then some are even taped up with electrical tape and I rode through a 100 yd tunnel that had a foot and a half of water and a retaining pond and the bike never cut out this past weekend so I am a believer in dielectric grease. I also use a pressure washer but am super careful not to direct hit the connections by the top of the radiator shrouds plus the area under the battery with all the connections. I also made a homemade protector to shield that area from old bike plastics.

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11/4/2019 4:27 PM

MotoMo165 wrote:

I didn’t dielectric grease the rectifier/regulator. I have a 2016 yz250f, should I be concerned?

sgrimmxdad wrote:

Should be good but the dielectric grease process is something that needs to be done at least once a year I'd say, especially ...more

DuroTools wrote:

My bike has all connections even the kill switch greased then some are even taped up with electrical tape and I rode through a ...more

UPDATE: My bike is now having the dreaded issue or one of the issues I should say. Starts fine initially then once I give it any type of serious gas it backfires pops and cuts out losing power. Guess I'll be trying this part but seems like there is a newer part # now. Anyone have a link to an install video that shows how to set the TPI or do you just put it in the same position that the old one was?

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