Quote:
Originally posted by MOBLO1
the model stihl cutoff is ts450. I was told it might be sucking air and there is a pressure testof some kind that might find the leak. Is there a tool I can purchase or what is the procedure?
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Usually if they are sucking air (i assume from the carburator boot) they tend to rev real high because of the lean fuel mixture. The screw that is labled LA is the idle speed adjustment screw. I believe there are 3 screws(idle speed, low speed, and high speed) the biggest one is the idle speed screw. I'm not sure if adjusting this screw will fix your problem or not. It could be that your spark arestor screen is plugged or I have even seen torn fuel lines and carburators that need to be rebuilt.
Good luck