RD35
Super OPE Member
- Local time
- 11:28 AM
- User ID
- 2806
- Joined
- Mar 14, 2017
- Messages
- 109
- Reaction score
- 318
- Location
- Bloomington, IN
Hello folks! Need some expert opinions. I just finished doing a re-build on an MS310. New piston, cylinder, crank bearings, seals, and muffler. Disassembled and cleaned the carb while I was at it. So, put it together, poured some premium premix in the fuel tank and some chain oil in the oil tank. 3 pulls and it was running. Did a little teaking on the carb and had it running nice and smooth. Burped the throttle at low RPM's for a couple of minutes just to be sure everything was getting a good coat of oil. Then I started doing test cuts. So here's where it started getting wierd. Saw revs nice and crisp...no misses, no pukes, just nice response. Idles fine. When I rev it up and start cutting it runs great for about 2 seconds as I begin cutting through the log. When I push down and load the engine hard it starts 4-stroking and when I lift on it to relieve the load it struggles to speed up but then comes back to life and revs fine. I first thought it was too lean which I very quickly corrected by backing out the H jet. This seemed to have no effect except that it would 4-stroke with no load at a much lower rpm and was weaker. After about 5 minutes of cutting as the saw came up to full temperature this issue stopped happening and it cut just fine.
Any idea what might be happening with this saw under load when it is first started?
Any idea what might be happening with this saw under load when it is first started?