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I have a weird problem, only the right cylinder is running and while it is running I can put my hand over the back exhaust muffler on the non-running left side and it will suck my hand to it...it is pullin a vacuum back through the exhaust.

 

Stats:

1998 Banshee

Good spark both sides - when switched does not follow

No work done prior to failure

Spraying wd-40 into left carb will not make it fire

115 left and 120 rt compression

Tors removed for years

Ignition switch jumped/removed

Stock carbs with 350 mains and .30 pilots

FMF pipes w/Spark Arrestors

Ported

Has ran fine for years with these mods.

Stock airbox with lid - no snorkle

 

I think I will go after the reeds first...they are boyson, but are several years old.

 

Thoughts on the Exhaust pulling a vacuum?

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