sycoticbanshee00 Posted April 22, 2014 Author Report Share Posted April 22, 2014 It made 77 hp, 40tq on the dyno with that jetting. 400 main, 30 pilot, needle 2nd clip. Now that I went to try it out it bogs in 2nd gear when trying to launch and then it kicks in. Everyone else is taking off well into the powerband just like it's supposed to. My bike was actually better at taking off when it was stock than now that it's putting out double the hp. Fail... Quote Link to comment Share on other sites More sharing options...
camatv Posted April 23, 2014 Report Share Posted April 23, 2014 some sort of setup issue. OR its fine i'm 280-300lbs and most times need to launch in 1st. if i put a lightweight on the bike they will launch fine in 2nd. its just part of being a big dude. do some jetting checks i dont care what the "dyno" jetting shows. if i left the same jetting on the dyno runs i have had in the past in the bike when i ran it it would be dead lean and blow up. hell the 535 i had to shut the power jets off completely before it started making over 900 degree's on egt. cubs with stock carbs are usually in the 410-420 range on mains. but thats a cub. Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted April 23, 2014 Report Share Posted April 23, 2014 A cub on stock carbs? How'd that turn out? OP, did your motor pass a leak down test? Quote Link to comment Share on other sites More sharing options...
bluebanshee98 Posted April 23, 2014 Report Share Posted April 23, 2014 Def do a leakdown test. 400 mains is huge for that motor. I was spot on with 340 main 27.5 pilot 1.5 air screw mid clip stock needle in warm weather (60+) with stock carbs, since your a bigger dude IMO I would of went with a bigger motor like a 4 mil serval Ect but work with what you have for now. Get the jetting spot on first and then try it out again and report back. If it's still doing that could possibly be a dome issue when jetting is dialed in Quote Link to comment Share on other sites More sharing options...
sycoticbanshee00 Posted April 23, 2014 Author Report Share Posted April 23, 2014 Yeah I'll see when I can go out riding again and See how everything works out. Thanks for the help guys, I appreciate it. Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted April 23, 2014 Report Share Posted April 23, 2014 OP, if you don't know how to do a leak down test, here are some links. http://bansheehq.com/forums/index.php?app=core&module=search§ion=search&do=search&fromsearch=1 http://bansheehq.com/forums/index.php?showtopic=110585&hl=%2Bleakdown Quote Link to comment Share on other sites More sharing options...
possum Posted April 24, 2014 Report Share Posted April 24, 2014 simple fix, like said make sure your jetting is squared away. then see if that helps. if jetting is good or changes still dont help. you just need more arm or pump up the tires to 10lbs or launch in first. Quote Link to comment Share on other sites More sharing options...
sycoticbanshee00 Posted April 24, 2014 Author Report Share Posted April 24, 2014 True that on the psi, I had them at like 4-5 psi. My tires say 5 psi operating pressure, 15 psi max to seat the bead. With my fatass on it I'm going to need all the traction loss I can get. Lol Quote Link to comment Share on other sites More sharing options...
Frankthetank Posted April 29, 2014 Report Share Posted April 29, 2014 I would have to agree with WindycityJohn on this topic. Just a thought though, who built your motor? Quote Link to comment Share on other sites More sharing options...
sycoticbanshee00 Posted April 29, 2014 Author Report Share Posted April 29, 2014 I checked my plugs and they were a brown, caramel color all around the white area, not black or anything like that. CT built my motor and set it up. I'll have to double check on the mains because he might have told me they start with a 400 main and then lean them down accordingly. I know a lot of you are going to pick on me now because I mentioned "CT". Lol Quote Link to comment Share on other sites More sharing options...
2slow350 Posted April 30, 2014 Report Share Posted April 30, 2014 I've ever broke in a bike by running too big of jets.. Quote Link to comment Share on other sites More sharing options...
2slow350 Posted April 30, 2014 Report Share Posted April 30, 2014 Never* Quote Link to comment Share on other sites More sharing options...
Gman-7m Posted May 30, 2014 Report Share Posted May 30, 2014 Old post but, would loose squish or very high port timing cause the same symptoms? Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted June 8, 2014 Report Share Posted June 8, 2014 Absolutely. Depending on a few variables. Squish..... Maybe more dependent on a setup. Quote Link to comment Share on other sites More sharing options...
camatv Posted June 14, 2014 Report Share Posted June 14, 2014 yes on the high port timing. maybe not on the loose squish.. much over 200* on the exhaust on a full weight bike and your asking for some bogg issues with "heavyweight jockey's get in that range on a stock cyl small cc motor and your going to need alky for sure and a dead on setup. on my welded sc 350cc, +6 swinger and steel axle with 12 haulers it only likes to take off in 1st with me on it loose some weight on the jockey and it flys off in 2nd thats 14/41 gearing full steel chassis with real shocks. i left a lot of timing out of it because it also like to kinda stand up a tad on the launch.... but its a quick shift to 2nd and its gone... the 421 cub on 110 with stock carbs was a blast to ride... it didnt bog as bad as some other gas ones i have done with larger carbs.. pump gas carb cubs are kinda picky on setup.. i personally just slap in a set of power valves and cure that whole problem...... he hee Quote Link to comment Share on other sites More sharing options...
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