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Stihl 310 advice

Brettl

Brettl

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Dec 16, 2013
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Wichita KS
Good evening all. This saw starts just ok, 6 or 7 pulls. Most of my Stihls start with 2 pulls cold, 3 pulls max. Once started, this saw sounds and runs great until I put it to the wood and then it bogs. Compression cold is between 130 and 140. I'm pretty sure this is too low. What do y'all think? Thanks
 
Brettl

Brettl

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Dec 16, 2013
Messages
518
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Wichita KS
I was thinking lean too. I richened the top end as much as I could but the limiter needs to be removed. I'd like it to be that simple but was curious about the compression. The saw was nearly cold when I got the 130 reading. Thanks for the tips. It doesn't sound like it has an air leak but I'll check that fuel line.
 
dmb2613

dmb2613

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Running out of fuel , Stihls will run like a raped ape with a scored cylinder and 125 lbs of compression
 
a. palmer jr.

a. palmer jr.

Tree Freak
Joined
Apr 8, 2007
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Check your fuel line especially if it's an aftermarket part. Otherwise just richen up the carb a bit on the H and L screws, not too much though, maybe an eighth of a turn at a time..
 
Brettl

Brettl

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Would be nice to know a little more. How long has this been going on? Did it suddenly do this or slowly get to this point? Is this saw new for you or did you have it and cut with it a long time? Is this saw a high use? Forget the compression. It is OK there, not perfect but OK.
Thanks for the questions. It's a new to me saw. Looks like it's hardly been used. Duke, I've richened the bottom end to the point of it being too rich. I can only richen the high needle a bit so I need to remove the limiters. Thank you everyone for your input!
 
Brettl

Brettl

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Well, I've put a carb kit in and toyed with the adjustments. I should mention that these cars and their adjustments are something I'm proficient at. I'm still not convinced that 130psi cold is sufficient. However, after putting the carb kit in I fired it up today and tried to adjust the carb. The rpms didnt follow with my adjustments so it was obvious that I had a bigger issue. Today, for the first time, it started dripping out of the clutch area. Crank seal ya think?lol
 

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trains

trains

Firewood hack
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Feb 23, 2015
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778
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Australia
Running a saw without cutting, like what your currently doing with carb tuning will pump a lot of oil, and as its not being used in the chain in the cut, it goes everywhere.
 
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