t4driller
Daddy Day Care
- Local time
- 3:09 AM
- User ID
- 927
- Joined
- Feb 23, 2016
- Messages
- 1,470
- Reaction score
- 5,589
- Location
- Southwest pa
This is gonna get a little long winded so bear with me. I bought a 7910 in pieces in a box that had a scorched top end. The cylinder was cleaned up when I got it and everything looked good in it. No transfer left behind. I took some scotch Brite and ran threw the n cleaned with wd 40 until rag came out clean. Bought all new oem bearings , seals, piston , rings, gaskets, and couple other little parts. Got some of the parts off my local dealer and some off nate. Once I got the case split I sent all the parts threw the washer to be cleaned then reinstalled everything. Once I got the piston in and jug on i spun it over a couple times and it seemed to have just a very slight drag to it. I figured it was just new rings in a cleaned up jug. I assembled everything with stihl 2 stroke oil. Went outside to start it and it fired on the third pull. It just popped for a second or 2 on choke. Then wouldn't start on high idle. Each time I would pull it , it got a little harder to pull over. So I stopped and pulled the muffler and saw that the piston had scuffing/ groves almost on it. first assumption was wrist pin bearing or con rod bearing letting the piston rock back and forth a little. Checked them out and they are nice and tight with no up and down movement. So started taking some measurements of piston and cylinder. Now I know this isn't the best, most accurate way to measure. But it's what I have at the moment. It took me almost an hour of going back and forth measuring to come up with consistent numbers. so this is where I'm at. [emoji17] [emoji17] I gave nate a message lastnight to see what he thought. He said make a thread to get some opinions / input. Thanks
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