kramit Posted February 24, 2009 Report Share Posted February 24, 2009 Sherco USA Website shows the 125 Piston to Cyl Clearance at .0175mm to .0225mm. Multiplying by .3937 ( 1mm), I come up with .006 to .008 clearance. The well used top end clearance now measures under .003" Am I doing this right? Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted February 24, 2009 Report Share Posted February 24, 2009 Sherco USA Website shows the 125 Piston to Cyl Clearance at .0175mm to .0225mm.Multiplying by .3937 ( 1mm), I come up with .006 to .008 clearance. The well used top end clearance now measures under .003" Am I doing this right? Millimetres are metric, inches is something different. Quote Link to comment Share on other sites More sharing options...
copemech Posted February 24, 2009 Report Share Posted February 24, 2009 These clearance specs seem very tight! Yet at .003 is very loose! As I think it should be much closer to about .001 range! Do a lookup on the metric conversions. At any length, seems things are out of spec and a new piston may be in order as you can always go a bit over using the ABC spec for sizing which is just a bit! Quote Link to comment Share on other sites More sharing options...
mcman56 Posted February 24, 2009 Report Share Posted February 24, 2009 You are off by one decimal point. 1 mm = 0.03937 Quote Link to comment Share on other sites More sharing options...
kramit Posted February 25, 2009 Author Report Share Posted February 25, 2009 .0006 to .0008 sounds possible.......I guess Quote Link to comment Share on other sites More sharing options...
copemech Posted February 25, 2009 Report Share Posted February 25, 2009 .0006 to .0008 sounds possible.......I guess Yes, I think this is more realistic, yet also probably "new limit" spec. Typacally the "service limit" may be up too more than twice that amount, although I do not believe it is listed. As yours was at .003 and probably quite noisey. The majority of the wear should be on the piston itself and not the bore. So basically, if the cylender has no major gouges, you might want to do a light hone job on it and fit a B or C piston and get the clearances in line, and hopefully back to the range of .001 or possibly less. Honing in istelf can be critical, and unless properly done, i would almost rather see you just try to fit the B or C yourself! Quote Link to comment Share on other sites More sharing options...
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