HarleyTechTalk

If you can find it, Mike Roland did some excellent testing on TB size, here on HTT. Been awhile though.

i really dont think its a bottle neck i just have seen how times have changed and seems bigger is better on throttle bodies but maybe im seeing it wrong ,  im staying with the 53 i have dont think bang for buck would be worth it

Thanks for the replies.  So it looks like the 04 and on heads will work with my lower end.. 

Has anyone used the evolution industries compensator spring kit?  I have the SE comp and I was wondering if this kit would be quieter yet.

Also, this:

https://harleytechtalk.com/htt/index.php/topic,118230.0.html

I guess I would start by trying to understand if your TB is a bottleneck or not. Who ever tuned it would be the best person to ask that.

Also the SE58mm TB moves some decent air. Below is the dyno sheet for the 117" that No Cents built, making 136 horsepower and 127 torque. That motor ran great, I know because I put about 40k miles on it. I've also seen 124" motors make decent power with the SE58mm.

A larger TB may add some torque and HP in the curve, but I doubt it would raise the HP or torque totals unless the TB you have is restrictive.

I'm not advocating for the belt over chain.That being said,
There's successful Harley drag racers out there still using belts.
          Coff 06

This topic has been moved to Evo Sportster.

https://harleytechtalk.com/htt/index.php?topic=121648.0

This should be posted in Sportster section.

Hammer Performance is a vendor here, aswracing a member, they can answer all your questions if you don't get any here.

This is their website, note the first topic line!

https://hammerperf.com/sportster.shtml

As fast as heads go, the adage is, Horsepower is in the Heads! Your 883 heads are not up to the task.

Can't comment on flow. I have a HPI. 55/58 that's a few years old.
Jimmy told me the 55mm with the 58mm manifold helps with the flow.
Mine also has 1.8 runners        Coff 06