Please bear with me as I am rather new to attempting repairs on a chainsaw.
I have a McCulloch Mac 335 (it may be a european only model, but it is 34cc engine and 14inch chain, uses Walbro WT391 carb).
It started to smoke badly and lacked power, I knew it was burning a lot of oil, then it started to race (high idle speed, chain runs when idling). So I stopped promptly.
Discovered that chain oil rather than 2stroke oil was mixed with the gasoline, in error !!!, (petrol as we call it here in the UK).
I emptied the tank and washed it best I can with gasoline, and cleaned air filter, mixed fresh fuel and oil...etc.
I can start it with difficulty, but when it starts it is still idling way too fast and the idling adjustment (T) is ineffective, I can litrally take it counter clockwise almost till the screw is out without slowing the engine.
The L and H adjustments, I left with the limiters in place for now, but they seem to have some effect (all be it so slight, as I can only turn them 1/4 of a turn within the limiters).
I would appreciate your help here.
Is it likely that this is an air leak? (Or just blocked jets ?)
What is the best way to go about repairing it?. I can get a carb diaphragm and gasket kit. But I do not seem to be able to locate a source where I can get a crankcase gasket.
Your input and ideas will be greatly appreciated...Thanks in advance
I have a McCulloch Mac 335 (it may be a european only model, but it is 34cc engine and 14inch chain, uses Walbro WT391 carb).
It started to smoke badly and lacked power, I knew it was burning a lot of oil, then it started to race (high idle speed, chain runs when idling). So I stopped promptly.
Discovered that chain oil rather than 2stroke oil was mixed with the gasoline, in error !!!, (petrol as we call it here in the UK).
I emptied the tank and washed it best I can with gasoline, and cleaned air filter, mixed fresh fuel and oil...etc.
I can start it with difficulty, but when it starts it is still idling way too fast and the idling adjustment (T) is ineffective, I can litrally take it counter clockwise almost till the screw is out without slowing the engine.
The L and H adjustments, I left with the limiters in place for now, but they seem to have some effect (all be it so slight, as I can only turn them 1/4 of a turn within the limiters).
I would appreciate your help here.
Is it likely that this is an air leak? (Or just blocked jets ?)
What is the best way to go about repairing it?. I can get a carb diaphragm and gasket kit. But I do not seem to be able to locate a source where I can get a crankcase gasket.
Your input and ideas will be greatly appreciated...Thanks in advance