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Joined
4/27/2017
Location
Omro, WI
US
gaberas225
4/27/2017 9:52am
4/27/2017 9:52am
Recently rebuilt the top end on my bike at 35 hours.
Started up right away all good and everything. Rode it around for a bit before I raced it a few days later..
Went out for first practice and it ran great.
Went out for last chance and I stalled it in staging and it wouldn't start. Took the tank off and disconnected the fuel pump and re connected it and it started. Then the following day I went to start it in the morning and it wouldn't. Ended up having to bump start it. Then it ran/ started fine the rest of the day.
Next day it ran great for the day.. recently started it to load it and then shut it off. Tried starting it not long after and it wouldn't start. Turns over great but won't fire.. valves are all in spec, just can't figure it out
Started up right away all good and everything. Rode it around for a bit before I raced it a few days later..
Went out for first practice and it ran great.
Went out for last chance and I stalled it in staging and it wouldn't start. Took the tank off and disconnected the fuel pump and re connected it and it started. Then the following day I went to start it in the morning and it wouldn't. Ended up having to bump start it. Then it ran/ started fine the rest of the day.
Next day it ran great for the day.. recently started it to load it and then shut it off. Tried starting it not long after and it wouldn't start. Turns over great but won't fire.. valves are all in spec, just can't figure it out
Got it to run when I loaded it but after I shut it off loading it up I tried to start it not long after, it wouldn't start. Haven't tried since.. seems to be when it stalls it doesn't want to start. Only a few things I had to disconnect when I rebuilt it, those all are connected so I have no clue what It could be.
The Shop
double check cam timing, then move to sensors.
https://youtu.be/aLS6iut15TA
battery is still stock and fully charged
Always have used that starting procedure.
Is there a code that would flash on the light if it was the TPS
Just went out at started it. Started right away, shut it off and it started right up. On purpose I stalled it cause it seemed to be when it stalled it wouldn't start, didn't want to for a few min but now it did..
Could be the tip over sensor or maybe just a kinked line on your fuel pump. You can take the pump out and see if your lines are smooth.
Tried a few things. Guess we will see what happens this weekend. Hoping to get it all figured out before next weekends race.
Pit Row
Happened on my bike, and 4 others I know of.
Start with the simple things, and keep very good track of what you check/try.
Like Jack Wagon suggested, I'd check the spark first the next time the problem manifests itself.
It could be fuel delivery, but that doesn't make much sense either because it runs if you bump start it.
I'm thinking it might simply be flooded.
If so, hold the throttle wide open and crank it over for about 5 seconds.
Also, is it really a problem only when you stall it or is it actually a problem when it's already warmed up?
If it's the latter, than it points to the choke staying open.
Good luck!
Anytime I had problems with a four stroke not wanting to start, and it would by push starting it, valves were the culprit.
Also, have you tried clearing the cylinder before hand?
Might have to replace those filters a little more often.
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