066 lean issue

[Stihlmaniac]

Hey guys,

I have an 066 with a custom pipe and some porting done. Into the third cut I can hear the saw start to lean out. My thoughts are crank seals. Does anyone have any opinions?

 

[HuskStihl]

Does it have enough carb for what u'r asking of it?

 

[mdavlee]

If it does it on the 3rd cut it's running out of fuel. How's the tune? It's getting warm and leaning out more than likely so it needs to be a touch richer.

 

[Deets066]

What are your screws set at? You might need to re-jet

 

[Stihlmaniac]

Got it running good

 

[trappermike]

The best bet for you is to find a carb off a 064,unlike the 066 and 660 stihls it does not have a governer circuit in it which make high speed tuning difficult for a hot motor and the newer carbs will not allow power mods that I can do to the older carbs.The Walbro carb used on these size models is woefully small for any real power increase. I have proven mods for the un-governed 064 carbs.

 

[mdavlee]

Which 660 carbs have this problem? The WJ 69 has a removeable jet that can easily be bored out of swapped to the .74mm jet.