Gearing

[420_Big_Bore]

I'm about to go dragging tomorrow but i just need an opinion. I have a 420 bigbore banshee etc with 22x11x8 pro wedge 2's and currently running 41 rear sproket and 15 front. Is this ok? or what gearing do you guys recommend.

It's 200-250m dirt drag strip.

[Blue Duece]

id up the 15 to at least a 17 counter sprocket

[420_Big_Bore]

I was thinking to a 14 because wouldnt a 17 lag the bike.Plus wouldnt the pro wedge act as an extra gear as they balloon up. Like bog in holeshot and possibbly the bike will cross the finish line and still have more power left. I would want it to just cross the line at full power.But im not sure.

[Blue Duece]

naw im thinking your gears will stretch and pull like a son of a bitch, and you'll shift a lot less, providing your motor will pull the taller gear, your top speed will be a 100 mph rather than 70 mph, guys that drag have 100+ ponies and run a 18/38.......

[420_Big_Bore]

That makes sense. But i have tried a 16 on the front and it wont fit, would i need to modify the casing? And do i need the alter the back sproket or leave it 41?

[Blue Duece]

yeah an 18 will fit, just take the chain off then the sprocket, then put your 16 on, then the chain, if you have a stock swing arm and a fresh chain you might need to add a extra chain link, im not sure, if not youll hook that much better your axle will be closer to your motor, the 16 will pull twice as hard as the 15 again providing your motor has some balls

[23champ]

200 meter? sounds like a pretty long drag strip...hope there is a lot of shut down room.

[420_Big_Bore]

Ok. Thanks for all your help mate. Im off to the drags now, will let u know how it went.

 

Thanks again!

[flea49]

I run 17-40 on a 4mm,thinking about a 18.

[420_Big_Bore]

Yeh plenty of shutdown space. Today turned out ok. I did wipe out all the 450's and a few banshees but there is a problem. I can't take off in 2nd, as it bogs, and when i cross the finish line i am in 5th gear, with an extra gear to go. Would lifting the back to a 42 help?

 

Ps:i am running 15-41

Edited May 6, 2006 by 420_Big_Bore

[23champ]

I wouldnt worry about shiftin to 6th. Gear your bike for 1-5. 6th is a long jump from 5th....could make you bog.

[rocketboy]

if yo u have a ported 420 and yo u bog off the line in second gear with only a 15 front sprocket theres a problem , an mild 350 could launch in second easily with that gearing in dirt.

[[email protected]]

im running 18/38 and i want to go down just a TAD ..... to 18 .40 i can get the bike launchin in 2nd no prob.... just i think you should play around with your gearing your gunna find alota differnt combinations of gearing and tires that you will work better for your needs ...... im running 21" on ashpalt and i need WAY too much space to get this bike REALLY SCREAMING ..... best bet dude is play around with the gearing 1 change at a time till you find your perfect combo....

 

2nd gear launches is a must for me

 

 

[420_Big_Bore]

Yeh i was able to take off very easy in 2nd with my kenda dominators 20x11x10 but ever since i put the pro wedges on 22x11x8 i have had problems. But i think i will just play around with the sprokets.

 

Thanks for all help.

[[email protected]]

i had 20's on a 15/38 gearing and thats what i loved....

 

 

let me know how she runs