18 450fe stalling

Related:
Create New Tag

3/28/2018 4:04 PM

My son has the 18 450sxf fe and when we first got it it was stalling a lot in the corners, found the idle was low and adjusted it and it helped a lot but still stalls. So I was wondering if a low or high tps would do that? Or anything else? If it could be the tps do I check and adjust it the same as my 16 250sxf?

|

3/28/2018 4:21 PM

On these new bikes, the tps works with the idle. So when you turn the idle up, it also raises the tps voltage. According to Tokyo mods anyhow

|

3/28/2018 4:24 PM

OK thanks so it sounds like it'll be just like the 250

|

3/28/2018 5:01 PM

The TPS setting right from the factory seem to be set too lean on the current bikes. I see them coming with them set at 4.5-5 volts and it will take a reading above 5.5 to almost 6 volts to correct this.

Paw Paw

|

3/28/2018 5:03 PM

You really need to bump up the TPS voltage. I'll be putting on the FMF slip on tomorrow and I adjust mine afterwards. I'll let you know what my starting setting was and what I settle on after adjusting it and if you do it your bike will start much easier and will be much more responsive when cracking the throttle and will stop the flameout/cough stalling. I started mine today for the first time and it's super sluggish right off of idle and I'm positive to bumping up the TPS will solve it because it did on my previous 3 450FE's

|

3/28/2018 5:11 PM

Paw Paw 271 wrote:

The TPS setting right from the factory seem to be set too lean on the current bikes. I see them coming with them set at 4.5-5 ...more

My 15 450FEs starting voltage was 49 and I bumped it to 63 and it ripped afterwards. My next 2 came in at 55 and I bumped those to 63 and 64 and they both ripped afterwards and I'm assuming that I'll need to do the same to my new one especially after installing the DT1 screen less filter cage, FMF slip on and I run straight Renegade SX4. All 3 of those things are introducing more air to an already lean set up from the factory.

|

3/28/2018 5:39 PM

OK thank u all for the replies and I'm assuming I have to turn idle all the way down b4 checking and setting correct? And paw paw I haven't heard of the settings being 4.5-6 volts it was always .40-.60 volts so do I need to set my volt meter to a different setting? Also does the manual say what the setting should be?

|

3/28/2018 6:01 PM

OPPS... I did put the "." in the wrong place.....

Paw Paw

|

3/28/2018 6:10 PM

ktm-5 wrote:

OK thank u all for the replies and I'm assuming I have to turn idle all the way down b4 checking and setting correct? And paw ...more

I left my idle where it was from the factory and set it to 0.59 volts. My bike is bone stock. Cannot believe how much of a difference the TPS setting makes, it is even more crisp right off idle.

|

Tomac and/or Anderson for 2020.....

3/28/2018 6:12 PM

ktm-5 wrote:

OK thank u all for the replies and I'm assuming I have to turn idle all the way down b4 checking and setting correct? And paw ...more

BobPA wrote:

I left my idle where it was from the factory and set it to 0.59 volts. My bike is bone stock. Cannot believe how much of a ...more

OK thank u, I'll definitely have to check his this weekend. What was your setting b4 u adjusted it?

|

3/29/2018 8:03 AM

ktm-5 wrote:

OK thank u all for the replies and I'm assuming I have to turn idle all the way down b4 checking and setting correct? And paw ...more

BobPA wrote:

I left my idle where it was from the factory and set it to 0.59 volts. My bike is bone stock. Cannot believe how much of a ...more

ktm-5 wrote:

OK thank u, I'll definitely have to check his this weekend. What was your setting b4 u adjusted it?

I should clarify that I have a ‘17 450. But the basic principle applies. Mine was at 0.51 volts. Did you buy the tool to do it? Makes life incredibly easy. They seem to be happy around the 0.60 volt area...probably a lean setting from the factory due to emissions.

|

Tomac and/or Anderson for 2020.....

3/29/2018 8:40 AM

BobPA wrote:

I should clarify that I have a ‘17 450. But the basic principle applies. Mine was at 0.51 volts. Did you buy the tool to do ...more

0.51 volts at what RPM?

|

2021 Husqvarna FC-450 RE
2019 KTM 250 SX
2015 KTM 150 SX
2015 KTM 200 XC-W

3/29/2018 10:26 AM

ktm-5 wrote:

OK thank u, I'll definitely have to check his this weekend. What was your setting b4 u adjusted it?

BobPA wrote:

I should clarify that I have a ‘17 450. But the basic principle applies. Mine was at 0.51 volts. Did you buy the tool to do ...more

Tomok wrote:

0.51 volts at what RPM?

You set the TPS voltage without the bike running Tom. My starting voltage on my 17FE was 55 and I bumped it to 63 and it goes from sluggish revving on the stand to very crispy and much more responsive and it starts so much easier too. Very very noticeable.

|

3/29/2018 11:06 AM

ktm-5 wrote:

OK thank u, I'll definitely have to check his this weekend. What was your setting b4 u adjusted it?

BobPA wrote:

I should clarify that I have a ‘17 450. But the basic principle applies. Mine was at 0.51 volts. Did you buy the tool to do ...more

Tomok wrote:

0.51 volts at what RPM?

As Digger said, you set it when the bike is not running. You plug in the tool and then bump the starter, which turns the ECU "on". From there I just set it to .57 and tried it, then tried 0.62, and settled at the current 0.59. It is a slight trial and error method, but it worked for me, and only took about an hour. Digger is probably running a pipe with some airbox mods to be running 0.63.....Not to mention every bike is different.

|

Tomac and/or Anderson for 2020.....

3/29/2018 12:05 PM

BobPA wrote:

I left my idle where it was from the factory and set it to 0.59 volts. My bike is bone stock. Cannot believe how much of a ...more

ktm-5 wrote:

OK thank u, I'll definitely have to check his this weekend. What was your setting b4 u adjusted it?

BobPA wrote:

I should clarify that I have a ‘17 450. But the basic principle applies. Mine was at 0.51 volts. Did you buy the tool to do ...more

Yes I have the tool, I had bought it when I was tuning the 250. I believe Tomok was asking about rpm because adjusting the rpm also changes the tps, I know my rpm is set at about 2250 so I'll see where my tps is from there and adjust. Thanks for all of the answers truly appreciate it

|

3/29/2018 2:00 PM

I just did mine and the initial setting was .54 and I then backed the idle all the way out and it was at .41. I then set the TPS voltage to .64 and it's awesome now, starts with just a slight tap of the button and barks from an idle without any hesitation or stumbling. BTW it's super easy to do now because they moved the TPS cover screws forward so it took a total of maybe 5 mins to do. Out of curiosity I rechecked the TPS voltage after the idle was reset to 2250 just to see what it would say and it said .74 so turning the idle back from backed out to 2250 bumps the TPS voltage for .64 to .74.

|

3/29/2018 2:11 PM
Edited Date/Time: 3/29/2018 2:12 PM

So glad to hear they moved the cover screws because the 250 was a pain the rear...lol. can having the tps too high have any negative affect?

|

3/29/2018 3:39 PM

Digger29 wrote:

You set the TPS voltage without the bike running Tom. My starting voltage on my 17FE was 55 and I bumped it to 63 and it goes ...more

10-4 Mike. I was just asking because it varies with engine RPM. I set mine to +.05 volts over stock, which is .40 with throttle plate 100% closed. I set it back to stock after Tokyo Mods re flash. See you at the Wick.

|

2021 Husqvarna FC-450 RE
2019 KTM 250 SX
2015 KTM 150 SX
2015 KTM 200 XC-W

3/29/2018 7:37 PM

I overheard a guy at the track today with the RE bike and he said he's been having problems stalling. He rev'd the bike for me and had a weird stumble as the revs came down... Not sure on the fix, but maybe ease some minds so you don't think you're going crazy.

|

3/29/2018 8:09 PM

I've heard of one guy who had a bad exhaust gasket so I wonder if the guy u seen does too??

|

3/29/2018 10:56 PM

Digger29 wrote:

I just did mine and the initial setting was .54 and I then backed the idle all the way out and it was at .41. I then set the ...more

Just to be clear you had 0.54 at 2250...and now you have 0.74 at 2250? This is a huge jump...

|

3/29/2018 11:51 PM

Another question I have is the tps setting's the same if I had a vortex ecu? I have a vortex in my 250f but had set the tps to the stock ecu

|

3/30/2018 5:43 AM

Digger29 wrote:

I just did mine and the initial setting was .54 and I then backed the idle all the way out and it was at .41. I then set the ...more

greg570 wrote:

Just to be clear you had 0.54 at 2250...and now you have 0.74 at 2250? This is a huge jump...

I have to agree with this. It sounds like there is another issue to be found that is causing this big of an adjustment need on the TPS.

Paw Paw

|

3/30/2018 7:14 AM

Digger29 wrote:

I just did mine and the initial setting was .54 and I then backed the idle all the way out and it was at .41. I then set the ...more

greg570 wrote:

Just to be clear you had 0.54 at 2250...and now you have 0.74 at 2250? This is a huge jump...

Paw Paw 271 wrote:

I have to agree with this. It sounds like there is another issue to be found that is causing this big of an adjustment need on ...more

Yes, without backing the idle out and just plugging in and checking it, it was at .54 and that's where my last 2 450 FE's were. My 15 was at .49. I backed the idle out until it stopped and watched the voltage as it dropped to.41. I then set it to .64 and started and then re-adjusted the idle to 2250 which obviously has an affect on the TPS's voltage. It's so easy to do now that I just went out and quickly rechecked it and it's at .71 and not .74 like I thought so I back the idle all the way back out and it went down to .64. I'll make any adjustments at the track tomorrow if I need to but it starts super easy now and has zero stumbles revving up and coming back down like it did yesterday before I adjusted it. I do have a cut air box, DT1 screen-less cage, straight Renegade SX4 which is oxygenated and the FMF slip on now and all of those things are definitely adding air to the already lean setup so maybe I need to be a little higher but all I can say is the bike runs tremendous now.

|

3/30/2018 8:43 PM

I will throw my tiny tach on and see where mine is at tomorrow at the track....If it is not too muddy

|

Tomac and/or Anderson for 2020.....

3/31/2018 12:14 PM

OK just checked mine and it was .54 going to try .59

|

4/1/2018 9:15 AM

ktm-5 wrote:

OK just checked mine and it was .54 going to try .59

I did 2 of my buddy's new 18.5s at the track yesterday and they're both bone stock and we ended up at .61. They both ran great after the adjustment.

|

4/1/2018 9:29 AM

CarlinoJoeVideo wrote:

I overheard a guy at the track today with the RE bike and he said he's been having problems stalling. He rev'd the bike for me ...more

I've been having this problem with one of our older bikes haven't figured it out yet.

|

4/1/2018 3:50 PM

Digger29, the ones you did the ended up at .61v were they stock motors and exh?

|

4/1/2018 4:12 PM

JBoneMotorworks wrote:

Digger29, the ones you did the ended up at .61v were they stock motors and exh?

Yes Josh, bone stock and super unleaded fuel.

|