Engine Will Not Start / High Pitch Exhaust

Q

Quetzal

New Member
I was riding just fine when the engine bogged down and died. I checked the usual carb settings and everything seemed to be fine. When I tried to start it up again it sounded much higher pitch in the exhaust and wouldn't start. I have taken everything apart, cleaned it and checked for leaks. I have spark and gas, there is air flow comming from the exhaust but it still won't start. Seals look good. I am lost as to what to do now. Any suggestions?
 
I'm only guessing here but is the small screw that holds the baffle/catalytic converter still in on the muffler? I'm thinking the baffle slipped down blocking something....maybe :p
 
I get that high pitch sound too on a cold start. Started to get it about 50 miles into the break in. Still runs fine though. Hope that sound isn't bad
 
The exhaust is fixed/welded together, no parst to adjust. I soaked the muffler in de-greaser and washed out a few particulates. The high pitch sound is louder now... and it is present with the muffler removed. Still no engine start, hmmm... where next?
 
The high pitch noise is more of a squeek with the muffler off, if that helps. Sounds like the piston is squeeking as it moves... I just checked spark and fuel again, it's got both.
 
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