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Burst of air, stuck on road

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After a top end rebuild (gaskets, valves, piston&rings, cylinder hone)

 

I've ridden it gently (sub 5krpm) for about 500kms.

 

Pulling into a parking lot, at a stop, applied throttle and had large puffs of air in sync with engine strokes hit my left leg and the bike shut off. Couldn't start again.

 

It sounded like weak cranks when I tried to start it again.

Not sure if the battery was dying with repeated cranks.

Limited troubleshooting as I had to get into work.

 

Any ideas?

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You have a hell of an air leak.

Tell whoever built your motor I said they suck. Where is it coming from? Hopefully the intake boot is just loose and it's not leaking from the cylinder or head. Post a pic were it's blowing .

 

 

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I rebuilt it.

So I guess I suck.

Lol

 

But how was it running perfect for 500kms then all of a sudden this?...

 

 

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Lol
Thanks for the update.

I believe the intake boot being compromised would cause a starting issue... but the burst of air could only be explained by the boot AND the intake valves remaining open during the compression stroke.

Correct?

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Couldn't feel the air cause it was pushing out the spark plug hole. I'm newb. It must've been loose then rattled out after a bit. That was a long bit to be loose.

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I actually only took the bike apart quickly in the morning before work.

Woke up late, had 5mins to take everything off.
Found the plug.
Won't get to work on it till tomorrow.

I'll keep this updated!

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By the way, chase the threads if your spark plug backed out.  Grease the tap so it catches any chips or gunk.

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