Stihl MS660 drive sprocket size?

[Jenny Tool]

Can anyone tell me from experience what would be the best choice as in super fast cutting speed without loading the motor up, for the following saw. I have a Stihl MS660, 36inch bar 11z, running Oregon rapid super chain, the question is what size drive sprocket should i choose? I believe they come in 7/8 teeth size, your thoughts and comments please.

 

Kind Regards

 

Chris

[Charlieh]

7 is standard, 8 will be 14% quicker but on a 36" bar on a 660 i would stick with the 7 as i think even when modded you wont have to torque to pull the chain with authority on an 8pin sproket

 

I run 8 on a 36" bar on an 084 but wouldnt do it on a smaller saw

[Jenny Tool]

See thats what im talking about listening to people like yourself, just the answer i was looking for thanks charlieh, although i wonder how much bhp a ported modified muffler 660 is pushing out compared to a standard 880? ill stick wiv the 7 tooth sprocket as advised, cheers man