BansheeUSA

Did you find a solution I’m having the same problem with similar build.

Okay so I have my build ready to run I am at 700 ft above sea level. I have 32mm keihins pwk and I’m trying to find jetting for 60-70 degree weather. I have just put in CEL needles on middle clip and I’m trying to find which number pilots and main. I have a 397cc 4mil stock cylinder. Pod filters no air box. +4 timing 22cc domes running on 105 octane gas. Any more info needed please let me know. Thanks to all who will respond!

Gotta be an easier way lol

Hey is their a way I can calculate the compression ratio on the build I have ?

Hey I will test it once again tomorrow. My compression tester is very accurate. With that compression what should I be running gas wise.

Yes the domes are perfect fit and are cut correctly.

Yes the domes before was running great but I was tired of running 115+ octane gas. Cost to much where I am. What octane do you suggest me using. That maybe the problem I am having. With the last domes the compression was 210 it only ran great when I used c12 which is around 100 for 5 gallon here.

What is a UCCR test

I have a 397cc 4 mil banshee which I have changed the domes to 22cc and I can’t get it to run like it should. mods are 66mm 795piston, 4mil long rod crank, Cel Needle middle clip, running 33 keihins. I am at 250 above sea level. The compression sits around 175. What gas should I also be running because I tried 93 and it was not performing well. I am willing to give any information on the bike. Just want it to run as it should and compete.

Yes and I think elevation plays a lot into it as well. Thanks for your info tho.

Hey so I have a 397cc 4 mil banshee that I am changing from race gas to pump gas. I am purchasing some 22cc domes from NOSS and I am wondering do I have to change my Jets for this mod. I am currently running 152 mains 48 pilots on 33 keihins. I am in Georgia as well which is around 500 above. So post your thoughts and your jet sizes that you are running to help me out. THANKS TO ALL

Just want some to real kick the newer bikes butt lol. I’ve had the builder do a 4 mil but I think he messed up the Cool heads so it’s not Getting it’s full potential

Yes this is what he said that it was really vital I run race fuel. I’ve just built the motor for a 4mil. Crank. I think he kinda messed it up because I have cool heads so he should have to cut the domes or anything right?

Does 135 compression sound to low for a 4mil ?

4mil stock cyl. 66.50 pistons with custom domes by builder has 135 psi compression how am I able to bump this up to higher compression. He told me if I changed domes they would not fit. He said it is already at .015 and very high compression, and race fuel is needed. I am running +4 timing and 33 pwk keihn. What are some ways I could bump the compression up to 150-170 or so to get more power. I’m new at this so I’m having a hard time understand, but I am willing and wanting to learn more.