have any of you guys ever tried one of these?

....reducing the front tranny pulley from the standard 32 tooth to 30 tooth for added torque off the line?

thinking about doing it while i'm in there

 

It is cheaper to change the front compensator. I have done that on my TC88, gone down from 25T stock to a 21T. Changing the belt drive can involve a new belt, which if you don't need one is expensive. Changing the compensator can involve a new chain, but that is cheaper.

Going from 32T to 30T will give you an increase in rear wheel torque of just short of 7%. If you changed your compensator from 24T to 22T (assuming we are talking evo here) you will achieve a 9% increase. Engine speed will increase from say 3,000rpm to 3,200 at the same road speed with your smaller pulley, or to 3,272 with a smaller compensator.

This is a pet topic of mine, so if you have any more questions, fire away!

 

interesting, grbrown

indeed, talking about a 91 evo.... i did the tranny pulley on my 07 dyna before i sold it and figured i'd do the same with the evo, but wasn't sure if i'd see the same results

compensator sprocket is a good idea, for sure ..... who makes them, and do you know how i'd go about getting a proper chain?

thanks, paul

 

Hi Paul,

Baker certainly make suitable compensators, as do others no doubt. They also have a good article worth reading and give correct chain sizes. Hopefully they also sell them. When I did my TC88 I bought a boxed Harley kit, so took a short cut!

I am sure the major Harley specialists will sell these as after-market parts.

 

baker does make a nice kit.... runs about 300.00...includes compensator and chain

surely cheaper than doing the pulley and belt considering cost of parts and tool to remove pulley!

thanks

 

I went the opposite way from a 32T front pulley to a 34T for more top end. Seemed like my engine was winding out way before I was ready to. Now it lopes at around 70 mph and launches across intersections. I do have my top end built out with midrange cam, S & S "E" carb, etc. Mileage is good too at about 40-42 mpg. You will notice a drop in mileage if you gear down.

 

that's a good point, Tactical

i live south of boston, ma.... so a lot of driving i do is off the line

we're constantly faced with cagers and congestion...so making quick moves is imperative .... gearing down is a survival mechanism!...lol

 

Sounds like a good move for you then. You'll be raped ape fast off the line but will be winding that b*tch out in high gear.

 

Ran your gear ratio and already @ 3.37

http://bigboyzheadporting.com/Gearratio.htm

I am at where you are wanting to go with my big bike, you will have accelleration out the wazu but I tend to shy away from 75-80 mph highway speeds.

 

... yah, i'm all set with driving that fast, as well...it's not necessary for me given the environment that i ride