Posts
13
Joined
4/15/2012
Location
Tempe, AZ
US
Edited Date/Time
12/2/2015 5:15pm
Last August I purchased a 2015 yz250f from a dealer. First off let me start by saying that i dont get to ride much, maybe once a month. Two weeks ago i pulled the bike out of the garage, and began getting the bike ready to go ride. Put air in the tires and put a clean filter on. I fired the bike up and let it idle. I put my tools away, and then was going to ride it from my driveway to the garage in my back yard.
While riding the bike to the garage, i was about half throttle 2nd gear. While riding the bike bogged and died. I was not shifting, or slowing down, it just died. At first, I had no idea what the issue is. Since this date, i have emptied the tank and put new gas in. Put a new spark plug, and checked the spark. I can see gas on the plug and on the cylinder. The bike feels like it has normal compression. I just went through and unplugged all of the clips on the wiring harness, and put dielectric grease on all of the connectors. I did notice that there was some rubbing on the neutral switch along the frame. I taped that just to be sure that there was not a short in that wire (I don't even think that would cause the bike to not start).
I've read on these forums about bikes not being able to stay running, but not a whole lot on them not even being able to start. I have tried everything that my friends and i have thought of to check. I was just reaching out to see if anyone has had a bike die on them while riding like this, and be unable to start at all afterwards. Thank you in advance.
While riding the bike to the garage, i was about half throttle 2nd gear. While riding the bike bogged and died. I was not shifting, or slowing down, it just died. At first, I had no idea what the issue is. Since this date, i have emptied the tank and put new gas in. Put a new spark plug, and checked the spark. I can see gas on the plug and on the cylinder. The bike feels like it has normal compression. I just went through and unplugged all of the clips on the wiring harness, and put dielectric grease on all of the connectors. I did notice that there was some rubbing on the neutral switch along the frame. I taped that just to be sure that there was not a short in that wire (I don't even think that would cause the bike to not start).
I've read on these forums about bikes not being able to stay running, but not a whole lot on them not even being able to start. I have tried everything that my friends and i have thought of to check. I was just reaching out to see if anyone has had a bike die on them while riding like this, and be unable to start at all afterwards. Thank you in advance.
The Shop
FYI 5 PSI will blow your finger off the hole.
Honestly if i can pinpoint that it is a motor issue i am more than fine with that since the dealer extended warranty will cover that. I already spoke with the dealer about the issue, and they have no problem diagnosing it. The only area for concern with that is if they find an issue that turns out to be a "non wear part" then it is on me. But if they diagnose that it is the stator, or it is some other electrical issue, then that is covered. I am worried about them spending 4 hours diagnosing it and then pin it on me. I wouldnt be able to cover the repairs at that point, hence why i am trying my best to diagnose it from home.
Once again, thank you for all of the replies. Once I try these ideas ill update everyone.
Take the air filter out and squirt some starting fluid down the intake and kick. If it starts and then dies its fuel.
tell me about this warranty. Dirt bikes come with no warranty and if it did .... your tinkering around would void a warranty.
I asked a lot of questions about it, and have called and talked with the service department about this issue. If they diagnose it and it is a TPS or a timing issue, then it's covered. If I had money, then I'd have no problem having them diagnose it.
I just don't want them to spend 5 hours diagnosing it and it was something like the throttle body is gummed up, or something of that nature. Then I would have to pay back the labor and stuff.
I was just trying to do everything I could to make sure it isn't something that can be my fault, so that I'm not out the service money and parts.
Tonight I will try the staring fluid before I check the compression. Thank you for all of your help
Pit Row
Read my thread. After THOUSANDS of dollars wasted chasing this problem mine seems to have been the TPS sensor. Yamaha made a new one to replace the original part. The old and new part number is in my thread. Good luck! Yamaha should recall the damn things. We bought a new 16, still race prepping it. Hoping not the same problems! Identical problem, seen it on SEVERAL 15's!
I am having a similar problem with a 2015 YZ 250F that just started bogging and popping with 20 hours on it. It fires up fine but bogs as soon as throttle is applied. I dumped the fuel to make sure no water. Then the plug. No dice.
So as soon as I got home I did a leak down test and had 10% so now I know it's not a mechanical issue. It rules out timing errors, valve issues, ring issues, piston to cylinder clearance issues and many more mechanical things so now it's on to what the actual problem is.
ALWAYS, AND I MEAN ALWAYS DO A LEAK DOWN TEST FIRST !!!
I have chased my tail on FI bikes for months only to finally do a leak down and find a stuck ring or valve not closing with 85% leak by.
I check my compression even though it doesn't mean much with a auto de compressor and had 130lbs with the exhaust valve slightly open with the auto de compressor.
Jason
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