Question about 2003 Suzuki RM 125

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Hi,redone the top end of my Rm125 1989,it struggled to reach powerband for a while, but eventualy it reached it!Next morning I started the old lady and there was almost no compression with a funny noise in the exhaust,stripped it and found a piece of the piston that broke off on top in there!Sparkplug was hit by the piston also.Why did this happen?

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  • Suzuki Master
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It probly hit the valve cause u didnt set the mechanical timing rite-now its bent and leaks compression at TDC--also u sure the rite size piston was used-do u have a repair manual

Posted on Mar 13, 2011

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  • Master
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Hi, i presume that before you rebuilt the top end you had no issues? Normaly this happens when either you have exsessive play in either the big end or the small end bearing, this would be recognised by up and down moovment in the conrod for big end and piston for small end, this would account for spark plug contact only. The other thing to check was the piston identical in height to the old one, did it have the same cut outs for fuel transfere, and finaly did you install it in the correct direction with the rings located in the peg positions facing the inlet side of the barrel, was the new head gasket the same thickness as the old one, did you run i the new piston for a while if the piston and cylinder were new a bed in period must be observed

Posted on Mar 13, 2011

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