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April 25th, 2017, 09:50 AM   #1
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Husaberg 06 fs650 will not start, backfires

I just rebuild my bike and when I was test driving it, i didn't have time to pull the clutch in when a car in front of me braked, and the bike stalled. After that the bike has not started, not with kickstart nor e-start. It back fires some times, and the fueling is on point. I started to think if if the timing chain had jumped one tooth, but when at tdc the timing looks correct when inspecting from the clutch side from the two gears. Where could the problem be? Any suggestions?

Last edited by Mater; April 25th, 2017 at 09:56 AM.
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April 25th, 2017, 10:26 AM   #2
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uhm ...I am not sure if my suggestion can be correct but check the valves ...It happen a similar situation on my pit bike, I was teaching my gf how to run it and she had one of those stupid fall and stall it, it did restart for one second and backfire...and wont start again...I open the engine and find out a valve dropped (engine blow)

but that's a 300 pound chinese engine I really hope it's not the same in your case
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April 25th, 2017, 10:44 AM   #3
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Valves and valve clearances are ok. I get a good spark, compression and fuel. Me and my friend got an idea that altough the spark is good when the plug is out maby it isn't strong enough under compression?
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April 25th, 2017, 11:25 PM   #4
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Could be ...but if you got spark, compression(with good timing and valve), and fuel then should start ...expecially if it was fine just before ...what I can say recheck carb but even try to change the spark for what it is might be worth replace it and see if that fix the issue

....I been thinking of this one during work, try to replace the spark and see if it fix the problem I personally only replaced the spark once on the sxv when one of the cylinder went off but never had this issue for years since I move on 4 stroke, but what you describe is actually a Common problem on 2 stoke that the spark can go or it gets week when restarting ... let me/forum know the resoult

As long as engine mechanic (valve.. chain ...etc) is in place ...carb and spark are the 2 other things

Last edited by paolo6; April 26th, 2017 at 03:25 AM. Reason: Info
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April 26th, 2017, 05:53 AM   #5
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Sparkplug is new, I have tried a normal sparkplug and also iridium plug. I have inspected the carb for wear and cleaned it also. Everything is on point, but still nothing, this is so frustrating.
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April 26th, 2017, 07:30 AM   #6
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It's really could be one of those this situation where there is an issue and you have no idea where is coming, I would take the head out and check it, at the end of the day is strange that a bike that worked fine won't start again after a stall ...also after an engine rebuild maybe a peace could had gone bad...I would check the head (take it off) and look at the case if you can see anything suspicious.. that's all I can think off
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April 26th, 2017, 10:17 AM   #7
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I know it may sound dumb, but replace fuel in the tank

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April 26th, 2017, 10:18 AM   #8
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Did that on my 09 xcf 450

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April 27th, 2017, 07:30 AM   #9
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good luck! sounds like time for some linear troubleshooting skillz.
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April 27th, 2017, 08:40 AM   #10
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You could pull your rotor on the crank and see if the key is sheared or missing. Or use a degree wheel to verify TDC That would cause your problem. The mass has energy and when the crank stops suddenly and the nut is loose it can shear the key or at least offset the timing too far advanced.
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