KEVSWS6 Posted January 6, 2009 Report Share Posted January 6, 2009 I ported and set the bike up for him. He has since made a few changes to try and make it faster. It will go faster but making changes will put you into new issues to deal with. He just needs to make a few adjustments and will be back in the ball park. Quote Link to comment Share on other sites More sharing options...
blanco25 Posted January 6, 2009 Author Report Share Posted January 6, 2009 Ive been told to add more air in tires if the bike hooks to hard. This will give it a little more wheel spin. As far as the flywheel,it was lightened a while back when I had a t-rex motor. But you're the second person that told me that the flywheel maybe shouldn't have been lightened. Quote Link to comment Share on other sites More sharing options...
burleybanshee Posted January 11, 2009 Report Share Posted January 11, 2009 I don't know if i read it right. But he said it used to launch in second. Kinda tells me maybe his compression has dropped off and not making as much low end torque as before? I would do a compression check and see. Yes it could also just be a jetting issue. I have a 4mil none cub with 15/41 gearing on 21x12x8 and have to launch in 1st if the sand is holding moisture. 14/41 gearing, he should have no problem, i am 230 pounds and don't have a problem in wet sand, aired up or down when i run the 14/41, was going to go to 14/43 and see if there is a happy medium. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted January 14, 2009 Report Share Posted January 14, 2009 I haven't figured the air pressure issue out, but I run 3.5 to 4.5 psi and launch hard in second with 14 staggered extremes on 10x10 wheels on my 421. NEVER bogs. BUT this is on a track and with a wheelie bar....I wouldn't launch it WOT with no bar, and then it MIGHT bog.... I have a friend that has a good running stock cylinder 4 mil that absolutely won't launch in second gear. My 391 Cub hates second gear sometimes (usually later in the night and racing to get closer to first place...then a big bog off the line in second after it was fine before...and put it in the trailer.) Quote Link to comment Share on other sites More sharing options...
superdad4301 Posted January 17, 2009 Report Share Posted January 17, 2009 I haven't figured the air pressure issue out, but I run 3.5 to 4.5 psi and launch hard in second with 14 staggered extremes on 10x10 wheels on my 421. NEVER bogs. BUT this is on a track and with a wheelie bar....I wouldn't launch it WOT with no bar, and then it MIGHT bog.... I have a friend that has a good running stock cylinder 4 mil that absolutely won't launch in second gear. My 391 Cub hates second gear sometimes (usually later in the night and racing to get closer to first place...then a big bog off the line in second after it was fine before...and put it in the trailer.) i do 3rd gear lauches on clay/dirt with no problem!15/44 gears stock flywheel(no way with a lighten one)i have a 7m twister with long rods and vitos 68mm cyllinders 190psi!i sit on the tank and hold the throttle about 50% dump and sit back!you alt to see the 5 bike jump i can get on some people!!2nd gear is uncontrolable for me!10 inch swing and will stand straight up! Quote Link to comment Share on other sites More sharing options...
blanco25 Posted January 17, 2009 Author Report Share Posted January 17, 2009 i do 3rd gear lauches on clay/dirt with no problem!15/44 gears stock flywheel(no way with a lighten one)i have a 7m twister with long rods and vitos 68mm cyllinders 190psi!i sit on the tank and hold the throttle about 50% dump and sit back!you alt to see the 5 bike jump i can get on some people!!2nd gear is uncontrolable for me!10 inch swing and will stand straight up! im trying to see what thats all about Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 17, 2009 Report Share Posted January 17, 2009 i do 3rd gear lauches on clay/dirt with no problem!15/44 gears stock flywheel(no way with a lighten one)i have a 7m twister with long rods and vitos 68mm cyllinders 190psi!i sit on the tank and hold the throttle about 50% dump and sit back!you alt to see the 5 bike jump i can get on some people!!2nd gear is uncontrolable for me!10 inch swing and will stand straight up! Put a 16 tooth up front, you need to be able to use 2nd gear, unless you're racing 100 foot. Quote Link to comment Share on other sites More sharing options...
superdad4301 Posted January 17, 2009 Report Share Posted January 17, 2009 Put a 16 tooth up front, you need to be able to use 2nd gear, unless you're racing 100 foot. i got a 16 tooth the other day have not put it on to see if i could use the 2nd gear! i was just stateing that a lighten fly wheel can get u to bogg but the heavier stock fly will will help keep the crank spinning with momentam and helps it not to bogg out!that is my theory anyway!i'm new to the drag side anyway!so i could be wrong! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 17, 2009 Report Share Posted January 17, 2009 16 tooth will help, 16-44 to 47 is what I run for my 10 mil cub. Fouledout421 would disagree with your flywheel statement. He's run a lightened flywheel on his 4 mil cub for the past few seasons, it works just fine, and he's a solid 200 to 220 lbs, so no lightweight. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted January 18, 2009 Report Share Posted January 18, 2009 I could leave in 2nd with my 4mil cub 15/40 gearing. with 13pdl extreme's But.. I've always done the opposite with my tire pressure compared to Travis. More pressure = more spin When I first got my chassis I was runnin 4.5lbs.. and my 60ft were horrible.. 1.67 to 1.75 was spinning till half track. Droped teh pressure to 3.5lbs and My 60 got better, started seeing 1.5's droped to 2lbs and started hooking too hard to keep the front end down.. that is 100% about tire pressure and traction. the more air in the tires, the easier youll be able to spin them. at hillclimbs i run my tires at 1/2 pound.. yes, youre reading that right.. half a pound. they are nearly flat and offer the most traction possible.. as far as the original poster is concerned, i would say you dont have enough power to be running those tall ass tires.. all you have is a dune port.. i think you need a smaller tire or youre gonna have to drop the gearing down more. maybe 14/44.. Quote Link to comment Share on other sites More sharing options...
Va585 Posted January 24, 2009 Report Share Posted January 24, 2009 I just drag my bike.We always run about 6psi in our paddels .If I am not mistaken 14/41 gearing is stock for a banshee and changing to 22" paddle tires with very little motor mods may be too much for that. I would go to a 43 or 45 rear and try to launch in second.I run 25" staggered 14 paddle extremes on my 20mil with 16/43 gearing. Quote Link to comment Share on other sites More sharing options...
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