Re: 103 piston hole good times!

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Yeah, you can run bit more compression on something that doesn't spin out as much. Combination of lots of RPM's and probably a hot spot etc caused it to start detonation. Oh and Steve hasn't ridden that 103 in almost year now... what the heck? Anyways, back off the timing a bit more.. probably 1.0mm btdc, run premium petrol. I run conservative timing around 1.0 to 1.1 btdc on 50cc kit that would jump above 14,000 rpm and still ended up popping a hole in the piston, I switched to a forged wiseco piston in hopes of reducing the chance of that happening again. Other possibility that might help is weld up that decomp hole and reface the head down. Oh and make sure carefully set your squish band clearance, that helps out with denotation as well.

-naz

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Subject Written By Posted
  103 piston hole good times!Topic by: Tommy Too Tall Tommy Too Tall 01/16/10 07:21PM
  Re: 103 piston hole good times!Re: Flagrant - Flagrant - 01/16/10 07:40PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/16/10 07:41PM
  Re: 103 piston hole good times!Re: same mike same mike 01/16/10 08:35PM
  Re: 103 piston hole good times!Re: rofman rofman 01/16/10 08:35PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/16/10 08:43PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/16/10 08:45PM
  Re: 103 piston hole good times!Re: rofman rofman 01/16/10 08:59PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/16/10 10:21PM
  Re: 103 piston hole good times!Re: Flagrant - Flagrant - 01/16/10 11:06PM
  Re: 103 piston hole good times!Re: naz naz 01/16/10 11:29PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/16/10 11:42PM
  Re: 103 piston hole good times!Re: Flagrant - Flagrant - 01/16/10 11:55PM
  Re: 103 piston hole good times!Re: Flagrant - Flagrant - 01/17/10 12:07AM
  Re: 103 piston hole good times!Re: naz naz 01/17/10 12:53AM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/17/10 01:23AM
  Re: 103 piston hole good times!Re: Jesse Stephenson Jesse Stephenson 01/17/10 01:40AM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/17/10 01:51AM
  Re: 103 piston hole good times!Re: Flagrant - Flagrant - 01/17/10 03:23AM
  Re: 103 piston hole good times!Re: Ian T Ian T 01/17/10 05:07AM
  Re: 103 piston hole good times!Re: Flagrant - Flagrant - 01/17/10 02:25PM
  Re: 103 piston hole good times!Re: mit mortso mit mortso 01/17/10 02:32PM
  Re: 103 piston hole good times!Re: naz naz 01/17/10 02:49PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/17/10 04:04PM
  Re: 103 piston hole good times!Re: no groms no blasters no groms no blasters 01/18/10 05:50PM
  Re: 103 piston hole good times!Re: naz. naz. 01/18/10 07:51PM
  Re: 103 piston hole good times!Re: same mike same mike 01/18/10 11:11PM
  Re: 103 piston hole good times!Re: same mike same mike 01/18/10 11:14PM
  Re: 103 piston hole good times!Re: Tommy Too Tall Tommy Too Tall 01/20/10 04:35PM

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