dome size problem

[macgillivary]

ok so im confused

i bought a modquad head right, with 21cc domes so i could still run pump gas

anyways i put it on without looking, stupid mistake and then i blew my top end in my bike about 2 weeks later

when i pulled the head off i noticed on each dome is has the number 17 engraved on them

but still on the packaging of my domes it said 21cc

so what domes do i have 21 or 17cc?

now second question if i have 17cc domes and trying to run pump gas in them instead of race gas would that have helped cause my top end to blow, there was a hole in my left piston right under the plug

although the bike has alot of miles on it, it was bound to happen soon enough

[CombatTalon2]

ok so im confused

i bought a modquad head right, with 21cc domes so i could still run pump gas

anyways i put it on without looking, stupid mistake and then i blew my top end in my bike about 2 weeks later

when i pulled the head off i noticed on each dome is has the number 17 engraved on them

but still on the packaging of my domes it said 21cc

so what domes do i have 21 or 17cc?

now second question if i have 17cc domes and trying to run pump gas in them instead of race gas would that have helped cause my top end to blow, there was a hole in my left piston right under the plug

although the bike has alot of miles on it, it was bound to happen soon enough

374822[/snapback]

 

Should have bought a noss head. I would ask for some money for repairs since it was obviously their mistake giving your the wrong domes.

[05bansh]

If it says '17' on the side of the dome then the domes are 17. If I were you with the package saying 21 and 21's were what you ordered, I would be giving mod quad a call. I am not 100% sure on the detonation of running the pump gas with that high of compression, it very well sounds like it could have caused the hole in the piston though.

[macgillivary]

ahhhhhhhh crap, i just looked and have throw out the packeging they came in

still gonna call them though

worth a shot, its not a good bill i got coming

gotta bore it cuz the piece that broke out messed up my sleeve, new pistons, and possibly new crank bearings from all the piston shavings that floated around in there.......... and obviosly the right sized domes

awell may as well get some porting done while its all apart

should be good when i get it all back together

[05bansh]

Thats shitty man! Do you still have your reciept? Look at it from a positive point of view though, you get a new top end and you might as well port it!

[macgillivary]

ya thats the way im lookin at it, I got it all apart so why not get some work done to it that i wanted to do

like you said new top end and some porting done

the 35's cant push any more through those little ports i gotta get some bigger ones

put in some wisecos and ill be a destroying my buddies even more

[05bansh]

Get yourself some 36mm Lectrons