well, consider leaving teh current bike as is if it works...the money you want to spend could go to a whole other bike, a lightweight, which will go fast, turn and stop.

ducati's are nice

evo fxr's are alot of fun and handle well...I've had mine 25 years- I love it

Mike

 

My ex puts up with a lot! Two pretty fast cars, two snowmobiles, and Street Glide that I really enjoy tooling around in. Besides......I'm running out of room! Lol.

Just need to squeeze this bike a little more........it's a keeper!

 

The trip was amazing. The scenery from California to S.D. and back is incredible. This is an amazing country we live in, and I love it more today than I did two months ago, and that wasn't my first trip back. If I ever leave Cali, I have found the place I'll live out the remainder of my days. One of two: Logan Utah, or Idaho.

Your questions above pose too many variables for many to answer. Certainly for me to attempt to answer. I can tell you though, that I've decided that I am going to go with a FM 107" kit with ported heads and ported throttle body. That'll do me until I decide it's time to buy a completely new bike. But that's me, and it makes sense for me because I can do everything myself but for the tune. That makes it economical for me, and makes sense in that (until HD just came out with their 110" for our 103's) it's the biggest we can go without splitting the case. That is of no interest to me because I can't do that myself. AND....I think that that combo will be as good if not better than the HD 110". I really don't know much about the new HD 100" kit, but I'm certain it won't come in cheaper than the FM 107" kit. That would of course be the lynch pin of my ultimate decision.

That's just my thinking though, Joe. As for you, you'll sort it all out for yourself, I'd just hate to see you half *** it and end of having regrets, which is why I suggested you really think through this process. A bump in compression alone may be the way to go, but my gut told me that it'd never be something that I'd consider, though I do know the potential for a crisper throttel response would be pretty high. mkguitar kind of confirmed that gut feeling in his post whereby he mentioned other problems that persisted as a result of that very thing.

Let us know what you decide. As stated earlier....I'll be interested in knowing how it turns out if you do decide to simply bump compression.

 

http://www.bigboyzheadporting.com/TwinCamComp.htm

use big boyz calculator believe stock head gasket is .040-.045 stock head 85 cc stock flat top pistons -1.5cc 187 static i think 10.5-1 pistons are 12cc but punching in 12 cc domed piston with 85 cc head puts compression at 11.3 I think there is a new 10.5 for the 85 cc heads smaller dome than the 10.5 for mva heads .and u havent even punched in the cam yet which will totally change the final compression number

 

I was hoping to see more positive or negative feedback. More information from guys that have tried it. Are there gasket sealing issues?

I believe there is a .030 gasket and such. With some slight milling 10.25 to 1 shouldn't be too far off.

Input from forum members is always welcome. Going to the source (builder/porter) is the logical next step.

 

Joe: Why do we always tend to do the most logical thing last? I'm guilty as charged!

FWIW - I completely agree with you. It's that guy, if he's reputable, that will help you think this thing through.

Good luck!

 

Joe: Why do we always tend to do the most logical thing last? I'm guilty as charged!

FWIW - I completely agree with you. It's that guy, if he's reputable, that will help you think this thing through.

Good luck!

 

The wine with dinner was spectacular, but I swear I didn't post that last response twice all on my own!

 

Nothing wrong with keeping your stock 103 pistons and milling the heads to the cams. I'm running stock 103 pistons making 111tq/112hp with a very long flat curve. But that is near the limit around 115/115 with stock pistons and throttle body. If ya plan on more might as well go 107+. Talk to a few builders and make a plan.

 

What cams are you running? A set of SE 10:5 to 1 pistons are very cheap. That would open up a lot of great cam choices.