PRAIRIEOUTLAW Posted January 27, 2006 Report Share Posted January 27, 2006 I just bought a pro design cool head and was planning on getting a different set of domes since it came with 15cc domes and I really don't want that high of compression since I usually just trial ride and don't want to have to buy race gas. Question is I'm bored at .30 over, stock head now running 120psi comp. on both cylinders, boysen power reeds, and stock size carbs, with fmf pipe. Other than that I'm pretty much stock. When I buy a new set of domes do they have to be sized to fit my boring or will all of them work with standard bores of the engine? By that I mean not a big bore kit, but just standard boring up to 100 over. Also what size domes would you guys recomend. I wanna stay under the 160-65 range so I can run pump gas, as well as not put too much pressure on the rest of the engine since its not a new one being a 91 model. All replies are app. Quote Link to comment Share on other sites More sharing options...
PRAIRIEOUTLAW Posted January 28, 2006 Author Report Share Posted January 28, 2006 Guess no one has any experience with the cool heads LOL! I could really use some info on this guys, I thought everyone here was banshee freeks. Quote Link to comment Share on other sites More sharing options...
thegroup Posted January 28, 2006 Report Share Posted January 28, 2006 the domes fit on top of the cyl. take ur current domes and set them on top like i said. thats what ur new ones will fit Quote Link to comment Share on other sites More sharing options...
crazywheelerman365 Posted January 28, 2006 Report Share Posted January 28, 2006 I'm running 22cc domes with a .40 over bore and it runs like mad!! I think anything under 21cc your suppossed to run the good stuff . We do alot of trail ridding and all that , all I run is 93 octain and like I said it runs great ! you'll love it !! Quote Link to comment Share on other sites More sharing options...
Shee-Male Posted January 28, 2006 Report Share Posted January 28, 2006 22cc is equivellent to stock, you can get away with pump gas down to 19's If you wanna stay on the safe side run 20's and advance your timing 4 deg. w/ a light flywheel it makes for a really nice trail setup. The domes don't come to suit differant bores, the piston is altered to correct the compression ratio. .030 is like 2 fingernails thick, so it dosn't have much affect on the sealing surface of the head. Quote Link to comment Share on other sites More sharing options...
FIRST BANSHEE Posted January 28, 2006 Report Share Posted January 28, 2006 22cc is equivellent to stock, you can get away with pump gas down to 19'sIf you wanna stay on the safe side run 20's and advance your timing 4 deg. w/ a light flywheel it makes for a really nice trail setup. The domes don't come to suit differant bores, the piston is altered to correct the compression ratio. .030 is like 2 fingernails thick, so it dosn't have much affect on the sealing surface of the head. 465386[/snapback] depends on attlitude, with 19cc domes my cylinder psi is 185, thats to high for pump gas or even 50/50 mix. go to dlnoss web site. he has a chart that will get you in the ball park. Quote Link to comment Share on other sites More sharing options...
hittintrees srh Posted January 28, 2006 Report Share Posted January 28, 2006 21's or 20's should fit the bill nicely. Quote Link to comment Share on other sites More sharing options...
dlnoss Posted January 28, 2006 Report Share Posted January 28, 2006 Based on your compression with the stock head, 21cc domes would be a safe bet with premium pump gas. What is the elevation you will be riding at? I'm not sure about other manufacturers but my 'standard' domes will accomodate up to .080 over. Quote Link to comment Share on other sites More sharing options...
shanYE west Posted January 28, 2006 Report Share Posted January 28, 2006 Same with me... I use 19cc domes and I'm running 183 and I cant use pump gas If you want to use pump gas 21 or 22cc domes will work fine even with 22cc domes you will see a increase in compression should be around 145psi with 22cc at sea lvl according to the chart (with a fresh top end) could be lower with top end wear 21cc 157psi 20cc 169psi got my numbers from Pro-designs website Quote Link to comment Share on other sites More sharing options...
banshee tuner Posted January 28, 2006 Report Share Posted January 28, 2006 Go with what dlnoss tells you, he makes the noss head and I beleive his domes will fit your head. I'm not sure if he still does but he used to offer a discount to banshee hq members. Quote Link to comment Share on other sites More sharing options...
RNBRAD Posted January 28, 2006 Report Share Posted January 28, 2006 Stock is actually 23cc. If you need some 22cc pro-design domes, let me know. Quote Link to comment Share on other sites More sharing options...
PRAIRIEOUTLAW Posted January 28, 2006 Author Report Share Posted January 28, 2006 (edited) Thanks everyone. It really helps to have some advise from people that have used the equip. before. I think I'm going to try the 21's first and then I'll step up later if need be, after some work on the bottom end to make sure it'll hold up to the squeeze of more power. Edited January 28, 2006 by PRAIRIEOUTLAW Quote Link to comment Share on other sites More sharing options...
PRAIRIEOUTLAW Posted January 28, 2006 Author Report Share Posted January 28, 2006 One more quick question. Will the stock studs be long enough to mount the pro design unit or do I have to replace with longer ones? If so whats the best place to get them from. I haven't seen any on ebay or on any of the sites I've been searching. Thanks. Quote Link to comment Share on other sites More sharing options...
GYTWYPT Posted January 28, 2006 Report Share Posted January 28, 2006 Pro Design does take longer studs. They should have came with the head. Good luck finding a set if they didnt. Later Quote Link to comment Share on other sites More sharing options...
Bansheeduner02 Posted January 29, 2006 Report Share Posted January 29, 2006 i run 20cc domes on pump gas with a stock bore and i was running 140psi and that worked super good so if i was you i would go with 20s. if you bore you cylinders out you dont have to do anyhting to the head all the domes will fit unless you have a big bore kit or something like that. Quote Link to comment Share on other sites More sharing options...
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