wrist pin needle bearing

joek

New Member
Sep 1, 2009
33
0
0
detroit
also posted in 2 strokes, could not figure out how to move it here

I have a BGF Z50SL that I pulled the top end to clean out swarf from the crankcase and cylinder. the wrist pin
bearings radial freeplay feels ok, but the axial play seems excessive, the piston, wrist pin and bearing will rock side to side in the rod jounal about 5 to 10 degrees. is this normal for these engines?
 

Norman

LORD VADER Moderator
Staff member
Jan 16, 2008
2,605
2
38
67
pampa texas
you should see how sloppy my bushed wrist pin engines are compared to the needle bearing ones. I was going to replace the bushing then decided to go for it over a year ago still going strong look at the total tear down post that is the engine I was worried about I rode it today its still running great. I have been running all my engine lately on an oil sold at walmart polan syn 2 stroke oil at 40 to 1 runs better than on the 32 to 1 mix I've been using I also run the cheap regular gas with the ethanol for me its working great. this oil don't seem to leave any smoke either.
 
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donuts31

New Member
Nov 9, 2008
126
0
0
Colorado
I miss my Kingsmotorbike bushing engine (purchased 4 years ago). It was the most powerful engine I've ever owned and I traded the bike it was on for a 25 year old Jeep. It was a mistake that I regret each time I ride one of the newer engines.

Point being is that I never had a HT bushing engine fail on me but I've had a roller bearing cage disentegrate taking the top end with it.
 

gavmiester

New Member
Jan 9, 2009
46
0
0
stokers siding Australia NSW
had a mate bring his bike to me saying it was a bit rattly took it apart ! no bush in the piston at all was still running! got a machine shop to turn a new one up,couldnt find the standard size one,going great now.