spdbyspanklyn Posted June 7, 2011 Report Share Posted June 7, 2011 Hey guys. I am new to the HQ, great site. Anyway, I need help with jetting my bike. The motor is a 4 mill 115 long rod hot rods crank t-rex cylinders bore at 68.5 mm dune/drag port, CPI small bore inframes, 35mm keihen pwk 168 mains and 55 pilots. cel needle third clip position + 4 timimng. mixing ratio is 32:1 110 octane fuel. Last year I had a problem with the motor dying off in the top end. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted June 8, 2011 Report Share Posted June 8, 2011 Have you done a plug chop at all,I would think you would be lean on the main,when you say dying on top does it shut down or spudder Quote Link to comment Share on other sites More sharing options...
spdbyspanklyn Posted June 14, 2011 Author Report Share Posted June 14, 2011 Have you done a plug chop at all,I would think you would be lean on the main,when you say dying on top does it shut down or spudder Whats a plug chop? It will not rev out after 2nd gear. Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted June 15, 2011 Report Share Posted June 15, 2011 (edited) Possibly fuel delivery problem? Bad petcock or float level or cap vent. Search "plug chop", to much to type. Edited June 15, 2011 by Larry's Shee Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted June 15, 2011 Report Share Posted June 15, 2011 I know each cylinder pulls fuel diffrent that t-rex might actually need less fuel because it pulls it better,i would check with someone who has a similar set up,other than that try richening it up try a 180 main and see if it helps if not go down,if no jetting helps check electronics Quote Link to comment Share on other sites More sharing options...
spdbyspanklyn Posted June 15, 2011 Author Report Share Posted June 15, 2011 I know each cylinder pulls fuel diffrent that t-rex might actually need less fuel because it pulls it better,i would check with someone who has a similar set up,other than that try richening it up try a 180 main and see if it helps if not go down,if no jetting helps check electronics will do. Thanks a lot guys. Quote Link to comment Share on other sites More sharing options...
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