Dave,
You welcome
You have a carby problem!
The first questions were to elimate obvious issues.
If your air filter, or exhaust were impeded, and your motor was running you would think the engine is over fuelling when its not.
The questions on fuel starving were to understand if the HS speed circuit was at fault causing over fuel at Idle.
I am not familiar with your machine, but I have assumed it has a carby like a walbro or tillotson saw carby.
By the way both HS and LS needles interact through the whole throttle range, and what looks like a rich low end needle setting, could be a float setting on main needle.
Carby
Few simple things to know:
After kitting, you should set to standard settings, 1 3/4 -2 turns out usually on both LS and HS.
Over fuelling at idle is usually caused by either a worn out main needle, or crap under the needle, a "stiff" diaphram, air leaks, or the the float needle and seat height setting.
Some guys do a carby kit and dont realise how important it is to replace the main needle. some dont blow the carby out, and it is very easy to make an error with diaphrams during assembly
Main needle height setting is most critical!
Most blokes don't know you have to "set" the height of the needle, and there is a guage for it. With out the guage, it is done by trial and error, and its a bit tedious.
By hand you need to know that acutating lever should be almost parallel to the base, and that will get you close.
I run all two strokes on stihl 50:1 mixed at 40:1.
Good quality oil is important, but is not related to over fueling.
Good luck
Jed
February 2008
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