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Old 01-19-2010, 05:29 PM   #1
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Default One way shaft issues on a .28 Dynamite/Mach

I will try to get a picture posted later but I have a .28 Mach motor that has been running fine and even though its winter the one way bearing hasn't slipped yet either. Now the problem. The motor all of sudden started losing power and the temp started going through the roof no matter what I did. I pulled the motor apart to find that the end of the one way shaft that goes through the one way bearing looked like it had a cheese grader taken to it. The metal shavings got sucked up the side of the piston and sleeve before melting into the top of the piston. This was one of my favorite motors because I totaly ported (crank and sleeve),changed timing, put silicone in the crank for better flow and this motor on a fully dressed savage 25 with roll cage would suck the paint off of my buddies Revo and Jato 3.3's. What caused the shaft to do this? I am going to rebuild but don't want the same thing to happen again. Thanks!
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