DavidBrown1212
ArboristSite Operative
I got the 85CC BB (Dolmar/Makita 6400) kit from weedeater man, and while I am no 2-stroke tech, I am a pretty handy (I can rebuild a Cummins or build a structure) so I thought after my local saw shop quoted me well over a bill, I would try it myself. Does not seem to be a big deal, watched a few You-tubes on the subject and felt pretty comfortable with it. Well, a couple of beers and videos later, I decided to do a mild port. More of a polish, really. Anyhow, I did not remove much, the intake port looks a little sophomoric, but an improvement, the exhaust port came out really pretty, but then I decided to attack my transfer port. My burr bit had no buisiness in there, I knicked the wall, and raised one side 2.2mm at the peak (it was parabolic in shape). So when I go to install it, I have some trouble getting the jug on, but I eventually get it.
So when I finish, I got no compression. I check the spark plug, I check the decomp valve, then I tear it apart to find my ring in pieces. So I do it again the next week, same result. Could this be my sloppy grinding, or am I being too forceful putting the jug on?
There is only one ring per piston, sand the transfers in with 220 grit (what grit?), can I get any 54mm rings? I have seen some incredibly sloppy/extreme porting where I thought rings would surely catch! Why my mild shaving?
I will post pics shortly, time to work!
So when I finish, I got no compression. I check the spark plug, I check the decomp valve, then I tear it apart to find my ring in pieces. So I do it again the next week, same result. Could this be my sloppy grinding, or am I being too forceful putting the jug on?
There is only one ring per piston, sand the transfers in with 220 grit (what grit?), can I get any 54mm rings? I have seen some incredibly sloppy/extreme porting where I thought rings would surely catch! Why my mild shaving?
I will post pics shortly, time to work!