Chainsaw Repair

Remove the cage preferred method.  Drill cage out with bigger holes 2nd.

Also add a DP Dual Port muffler cover on the front. Then adjust the carb.

Aftermarket ones are a 1/3 of the cost of oem DP cover. 

10% off using this seller too.  http://www.hlsproparts.com/ProductDetails.asp?ProductCode=H90064&Click=2139&utm_source=googlebase&utm_medium=shoppingengine&gclid=CIq9yqmJmL4CFcU-MgodczUAOA   Hyway Stihl 064, 066, MS650, MS660 dual port muffler front cover

I tested a stock dp cover and a little more opened dp muffler cover without seeing any gains.  Oh I did have the side exhaust outlet already opened as big as the deflector instead of the  little hole they put out now days on the stock 660. So that could have made the difference in that cover test.

I tested a stock dp cover and a little more opened dp muffler cover without seeing any gains.  Oh I did have the side exhaust outlet already opened as big as the deflector instead of the  little hole they put out now days on the stock 660. So that could have made the difference in that cover test.

Yes and that muffler works good too.

Update: Had this saw sitting around my place for 6 weeks or so, he hadn't needed it for anything so wasn't in a rush. I had it dialed in pretty well with the dp cover but only had some smaller logs to try it in so wasn't sure how it would work stumping. Well he used it earlier this week. Said it sounded awesome to start! Which I agree with completely. But performance was up too, lot stronger one the stumps he used it on, said it laid right in and off to the races throwing chips! He killed the chain in the dirt so was cut short (for some reason he rarely files a chain ) before finishing the stump,  but said he's very happy. Can't beat a $20 gain like that! And I'm pretty sure I'll be the owner of that saw some day, hopefully sooner than later. Thanks for the info guys.