Dont use after market gaskets.
 

I just got done rebuilding my 87 Zilla and the shop sold me Cosmic gaskets. After a carefull break in period it was time to get on it. The first hard ride the base gasket blew right out. Now I can't ride this weekend and have to reinstall all of my top end gaskets, just because they sold me cheap replacements. Lession learned.

Dont use after market gaskets.
 

cometic are some of the best out there. is yours one of the models were it doesn't have 6 head bolts? cause i have heard of the ones with out 6 bolts blow the gasket all the time

Dont use after market gaskets.
 

oh i now see you said cosmic nevermind then

Dont use after market gaskets.
 

i have cometic gaskets on my 87, havent had a lick of trouble in 5 - 6 years. same with my buddy's 90. did you apply gasket glue to the thin spot right under the intake? real common to blow right there. good luck
aaron

Dont use after market gaskets.
 

I used Cometic head gasket on my '85 LT250R, I blew it after about 2 hours. It looked like it had a defect though, like the metal ring part was dented ahead of time. I didn't notice it when i was putting it together though. Anyhow, I put another one on and it has so far lasted for longer than the first one... about 6 hours now.

Dont use after market gaskets.
 

same here.my cometic head gasket blew within a few hours.then i bought a stock suzuki head gasket.looks to be much better and has held up for some time now.

Dont use after market gaskets.
 

Used cometic gaskets for years on honda trikes and quads, and zuki r's and never had a problem. Use them on my four strokes now and my friends still use them on thier banshees, blasters, honda r's, and everything else. Never had a problem. You can get a high performance/high compression gasket if you are running higher compression pistons and heads.

Dont use after market gaskets.
 

rebult my friends 01 blaster with cometics not a single problem.

Dont use after market gaskets.
 

I will have to chalk it up to a spot of bad luck. Stuff happens.