jscharphorn Posted June 3, 2015 Report Posted June 3, 2015 I have trouble with my hole shot, it just bogs most of the time and the drags are next week and at the moment I will have to bring my 4poke because this thing is not going to cut it. I am trying to take off in second gear I have a 421 cub, 33pwk carbs on 110 mix is 32:1 jetting 170 mains 600' elevation. sprockets 15/43 22" tires I have tried a bunch of different gearing and some different jets, needle is currently 2nd from bottom. any suggestions ? It seems everything I have tried does not work. Quote
Surfrjag Posted June 3, 2015 Report Posted June 3, 2015 Timing? Compression? 170 is probably rich too 1 Quote
bluebanshee98 Posted June 3, 2015 Report Posted June 3, 2015 What kind of drags? Dirt? Sand? Is your cub ported at all? Seems like a big main jet especially if it's not ported 1 Quote
jscharphorn Posted June 4, 2015 Author Report Posted June 4, 2015 It is not ported, sand drags but I am testing in my field with ambush 22's +4 timing compression 162 with 20cc domes Quote
Surfrjag Posted June 4, 2015 Report Posted June 4, 2015 Go to +6 timing and 160 main 110 straight not mixed Do you have a lockout? Quote
sleeper06 Posted June 4, 2015 Report Posted June 4, 2015 Compression seems low to not be ported, maybe shees tired. Who cut domes. What needle is in the bike I found d-series needles work the best in Cubs with those carbs . Can you do a plug chop. How do plugs look . Those jets don't alarm me so much Quote
jscharphorn Posted June 4, 2015 Author Report Posted June 4, 2015 Motor was completely disassembled and put back together by shawn at proformance prototype after I purchased it used. I have +10 swinger 110 race gas New drive line clutch , no lockout I do not know what needles are in it, I do not know how to tell . I did a glug chop last night with 168 mains, to me it looks lean but I am going to have shawn look at it this weekend. Quote
Surfrjag Posted June 4, 2015 Report Posted June 4, 2015 The needles are marked right near the clip. The 2 cubs I just tuned both wanted 160 mains. Anything bigger was a big loss in power. Did you check squish? Bump the timing at least and try again. Quote
jscharphorn Posted June 4, 2015 Author Report Posted June 4, 2015 dang, I hope it does not need a 160, smallest I have is a 162 Quote
Surfrjag Posted June 4, 2015 Report Posted June 4, 2015 Each bike is different so before changing jetting I would check squish and needle. Check pickup gap and new plugs gapped. Then try again. Any idea what base gasket? Quote
sleeper06 Posted June 4, 2015 Report Posted June 4, 2015 I think your crazy to not have a lockout, I have a decent amount of experience with 33s they like bigger jets than the more common 35s . My friends duneport stock cylinder chopped perfect at 172 main dek needle 2nd clip Quote
sleeper06 Posted June 4, 2015 Report Posted June 4, 2015 Is everything else up to par , I would do like surf said check squish ask Shawn what the band width is and angle. So it's new Pistons and rings 1 Quote
jscharphorn Posted June 4, 2015 Author Report Posted June 4, 2015 needles are OG plugs gapped at 22, I have tried new plugs also. squish and gaskets I will need to ask shawn. pistons and rings were good he said so we used them. I will talk to shawn tonight. was your friends clip 2nd from top or bottom ? Quote
jscharphorn Posted June 4, 2015 Author Report Posted June 4, 2015 also using bike as a duner also so that is why I did not go with the lockout. Quote
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