what size cool domes

[Toomey Man]

what size cool dome do I need do about 900 to 1000 ft. above sea level.

banshee is bored .50 over

got 35mm carbs 

kn air filter

run 92 octane

and mix 32:1 

[trickedcarbine]

22. Maybe 21 but it would be borderline. 22 and some timing should suffice.

[Surfrjag]

Call noss machine.

I would say a 20-21cc dome

[tfaith08]

I run stock bore and stroke on 21s at 100-200 asl with +4 timing on 93 and I'm doing great. 

[Toomey Man]

so I should try 21 are 22s with advance timing? also I live Pennsylvania.

[trickedcarbine]

Yep

[tfaith08]

I think you'd be safe with 21s.  I'm pretty close to sea level and my pistons and plugs show no sign of detonation.

[Toomey Man]

alright thanks guys. cant wait to get some cool heads on!

[tfaith08]

21s at your elevation should be fine with 92oct.  However, a lean condition will amplify the likelihood of detonation.  Best make sure you're fine there. 

[Toomey Man]

Alrighty anything else I should know be fore I get these bad boys 

[trickedcarbine]

Alrighty anything else I should know be fore I get these bad boys

Yes, do not get Pro Design shelf domes.

[tfaith08]

+1.  I've been on a Banshee with the same mods as mine except the domes.  His were custom (idk where from) at 155psi and mine were PD 21s at 150psi and his was noticeably stronger.  He would pull about a bike length over mine on an asphalt drag by the time we hit 70mph.

 

I'd call one of the site sponsors.  If I need a head cut, I go to a local guy.  If he can't help, I'll call Noss Machine, but that hasn't happened yet.  If you're spending money to do an aftermarket head, do it right.  A Chariot Performance head w/ stock PD domes will run you about 210-230 shipped.  Go ahead and spend the extra $50 to get even more power and response.

[Toomey Man]

so I should go with chariot performance head with stock pd domes? also what would happen if I ran 18cc cool domes instead of 21cc? 

[trickedcarbine]

No.

 

 

You should not use pro design domes. 18cc domes will require lots of octane or it will spit the plugs out. Then when you find a way to keep the plugs in, it will knock a hole through your piston/s.

 

As for the head, just about anything from a reputable source that is still currently being produced so parts are available. Also, steer clear of anything with propriatary dome styles. Those are usually a pain at the worst times.

Edited June 21, 2014 by trickedcarbine

[tfaith08]

Even if you kept it together with 18s, you'd still have to run race gas.  92 octane will not cut it. 

 

Do you have pipes yet?  I didn't see any listed in your list of mods.  If not, I'd go with that before anything else.  That money could get you a set of good used ones and the jets you need.  The difference between a piped and non-piped Banshee is significant.