bogging ms 310

[woodstacker]

Help!!! i have a ms310 that boggs at full throttle, back off to 3\4 throttle runs fine. Its said to be rebuilt, compression 115 lbs cylinder looks ok .Anybody got an idea what this could be. Thanks

 

[Haywire Haywood]

compression 115 lbs

That's your problem.... something is wrong there. It needs to be at least 135, preferably 145+. Stuck ring perhaps?

Ian

 

[computeruser]

What kind of compression tester did you use?

 

[woodstacker]

bogging ms310

Automotive compression tester; I don't remember the name. It's the one that I have always used. I also own an O31 and it's compression is 118 and the saw runs fine. I don't know if that matters or not or is there that much difference between the saws.

 

[Haywire Haywood]

Does your gauge have a schrader (one way) valve on it? If it doesn't, you'll get a false reading. If it truly has less than 120lbs, it's time for new rings and you're losing a good deal of power.

Ian

 

[windthrown]

Might just need to adjust the H side of the carb. But aside from that, the compression seems low... if it does have low compression, that would explain the bogging.

 

[mountainlake]

If the compression compares with your other saw it should be fine, gauge is off. I'd try opening the high adjuster a little first if that doesn't help be looking for bad fuel line or impulse line, clogged fuel filter, dirty carb or clogged tank vent Steve

 

[BobL]

Did you do the compression test after it was well warmed up? 115 psi is probably ok for a cold engine. I generally get about 120 psi cold and 145 warmed up.

 

[stonykill]

If the compression compares with your other saw it should be fine, gauge is off. I'd try opening the high adjuster a little first if that doesn't help be looking for bad fuel line or impulse line, clogged fuel filter, dirty carb or clogged tank vent Steve

my thought exactly

 

[woodstacker]

bogging ms310

Thanks for all the info i will check these things this weekend. I hope it runs as long as the poulan 245a and the 031 woodstacker