I have a 2005 deuce with SE air filter , SE pipes , stage 1 down load , andrews 21 cams and a 32 / 70 pulley set up and I'm looking for more bottom end . And need help with this . I would like to my keep drive belt.

 

You can change to trans pulley to a 30T to help that low end a bit but might hurt cruising speeds. Your factory set up is an over all gear ratio of 3.15:1 by going to a 30 tooth it will put you at 3.36:1 which will make a big difference on the bottom end. I wouldn't touch the primary keep that stock. You can go to the BDL website and they will have everything you need to calculate new belt size.
http://www.bdl-sales.com/

 

So your saying change the pulley on the rear wheel to what ? A 68t pulley. I like to hear more from the guys that did this mod with a tc88 5 speed .

 

This setup will increase the TQ multiplier in the first four gears by 10%; just a shade more than a 24/37 primary setup will; however, fifth gear will retain the 1:1 relationship and a 3.15 final drive. Installed on my '02 FLHT about two years back and love it; soon to install on my '05 95" Deuce.

http://twistgear.net/

 

It is simpler on a TC88 to change the primary drive ratio, rather than the rear. I used a 21T compensator on my '03 Dyna, although some may think that is a bit extreme. From the stock 25T I suggest changing to a 23T, to give you a 9% boost in torque, also a 9% change in rpms, at any given road speed. Changing by only one tooth will not be worth the expense IMHO and give little improvement. Leave the belt drive unchanged.

 

When your talking about installing it in your deuce . Are you talking about there $500.00 gear kit ?

 

Thanks for that idea. My primary setup is 25/36 and if I go with a better compensator it mite help that morning clunk .

 

Shouldn't I be looking to go up from 25t to 28t to make the trans spin faster ?

 

No, that's the wrong way, that will do the opposite of what you said you want, as will a smaller rear pulley. At say 3,000rpm in top gear a change to a 23T will increase rpms by 9% to around 3,260rpm.

 

Yup; that's the plan. Parts are available to convert your 25/36 primary to 24/37 but will cost almost as much as the Twist Gear setup but would be less labor intensive. However, the 24/37 will lower cruise rpms by about 200 as the final drive will change from 3.15 to 3.37. That's what I like about the Twist Gear; same advantage of the 24/37 but a close ratio four speed while retaining the 3.15 final drive.