Clerg32 Posted June 13, 2013 Report Share Posted June 13, 2013 Just got my 421 cub back from getting dyno tuned and its putting out just under 94 hp and just under 50 tq was wondering if that was pretty good and wondering if there where any other tricks to get more hp. Without running alchol 39 pwk Vforce 4 Timing at +5 Lightend flywheel Sb In frame shearers 20cc domes 1-5 dunable override Quote Link to comment Share on other sites More sharing options...
special06shee Posted June 13, 2013 Report Share Posted June 13, 2013 Id say your doing really well!! My old 421 cameron did made 94hp54tq. It had pwk35,cpi sb's, 20cc domes(i think) ran on sunoco110. Vforce4's Quote Link to comment Share on other sites More sharing options...
possum Posted June 13, 2013 Report Share Posted June 13, 2013 sounds like good numbers. There is 421's on meth in the mid 90's Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted June 13, 2013 Report Share Posted June 13, 2013 Thats good with inframes on gas. If you went back to the dyno and added a degree or two of timing to it you might add a little torque possibly but 94 is good. If you wanted out of frames it would be a little stronger as well if you want oofs. Theres a lotta 421s that dont hit 90 even on alky. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted June 13, 2013 Report Share Posted June 13, 2013 That's a good running motor. Who built it? Quote Link to comment Share on other sites More sharing options...
Clerg32 Posted June 14, 2013 Author Report Share Posted June 14, 2013 Kevin hjr built my motor Quote Link to comment Share on other sites More sharing options...
fappy'97 Posted June 14, 2013 Report Share Posted June 14, 2013 Where'd the post about K&T lightening flywheels go to? Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted June 14, 2013 Report Share Posted June 14, 2013 Meh, HJR! Woohoo! Fucking HJR! Yeah! HJR! Yay HJR! Fucking HJR! I love me some HJR! HJR has the most epic pair of nuts! Quote Link to comment Share on other sites More sharing options...
J-Madd Posted June 14, 2013 Report Share Posted June 14, 2013 Any off the shelf 421 makes 100 on methanol. (Not downing your numbers on gas at all.) Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted June 14, 2013 Report Share Posted June 14, 2013 running a lighter wheel and tire combo will free up some neddies..what are you running now? Quote Link to comment Share on other sites More sharing options...
Methfireroad Posted June 14, 2013 Report Share Posted June 14, 2013 Had my 421 cub dyno'd. And made around 83hp with 37pws on pump gas with +7 timing. Had v3 and inframe shearers... Quote Link to comment Share on other sites More sharing options...
Oregon dunner Posted June 15, 2013 Report Share Posted June 15, 2013 I have a 421 cub that cam put together and he dynoed it at 94 hp and 50t. 19cc domes Vf3 reeds +7 and Sunoco 110 35 pwk 150,45 cel in the middle clip Ported cub cylinders and case by Kevin at HJR. I forget the squish but I'm think the base gasket is .20? Not sure tho. I am going to have some different domes cut and and bring my squish down to .15 and may add some 39pwks. It's been a reall fun bike to ride in the dunes or tree shots. Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted June 15, 2013 Report Share Posted June 15, 2013 I am going to have some different domes cut and and bring my squish down to .15 and may add some 39pwks. It's been a reall fun bike to ride in the dunes or tree shots. Huh? Why?? 1 Quote Link to comment Share on other sites More sharing options...
Oregon dunner Posted June 15, 2013 Report Share Posted June 15, 2013 I was told by someone that it might help out more. I don't know if it will help or not. I was just trusting his word. 1 Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted June 15, 2013 Report Share Posted June 15, 2013 Well, I'm not a "pro" , but .15" squish sounds really,really tight. Plus you are making very healthy power as-is....why change it? Quote Link to comment Share on other sites More sharing options...
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