Cometic Triple Head Gaskets Vs. Normal??????

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PikledBeats

New Member
Apr 19, 2010
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Ok, so just for comparison, there is a pic. But is anyone else running these Cometic HD triple gasket. It seems warped, (This is the third one i've seen so I know they come this way) and it just seems as it would give more access to leaks. It is supposed to be a better head gasket made to size, but I'm leary. I'm curious what you guys think. The one on right is old O.E.M. just for comparison

334pzx1.jpg
 
I get that, But I was thinking this would just be more surface area to leak. For instance, with a normal head gasket it can only leak on either side but with this you have 5 surfaces compressing, 3 gaskets Head and jug = 4 "sides" that could leak air. They are actually rated stronger than O.E.M. I've just never ran one. It also does not look like O.E.M. material so expansion is another question. I am not against running it just was hoping for some feedback before buttoning up my top end

And on the same topic: Never seen one of these - "Exhaust gasket"

16iabr7.jpg
 
but as long as it is weighted down evenly it shouldn't leak i would run it just do a comp test after u break in the engine an if compression is bad ask 4 your money back
 
haha, I have like six head gaskets lyin around so not too worried. I'll be doin compression/leakdown etc. once it's together regardless. I was more curious if anyone had thoughts on what is better, under pressure, time, abuse. etc.... I have seen a few of them but never knew anyone who had run one. I've heard alot of people suggest cometic gaskets but just as many suggest O.E.M. as well. I personally have always ran cometic base gaskets but have never ran one of the triple gaskets and until now have never seen a blaster exhaust gasket like the one pictured as it usually is the ring type, which I have one of those for comparison as well.
 
2smoker85 said:
those exhaust gaskets are awesome, i didnt use that one but i did use one from the auto store and it stopped the gunk build up on the exhaust. the o ring ones suck. so i added the hi temp one from the o reilleys auto parts store, or this one. same concept, just make sure u get the right size.

GASKET - FLAT OVAL HI TEMP GASKET 3" I.D. 2 HOLE | eBay
Click to expand...

The one I have came in a cometic pack for a yfs200r blaster so it fits already stock hole/bolts. I was wondering though so since it is a flat gasket with the inner diameter cut at the same circumference of the inside of the o-ring type gasket are both used?

So I'm thinking the cometic blaster kit this came in was advertised as a heavy duty kit when I ordered it but I didn't think anything of it, as tons of advertisers say heavy duty whatever. Hell, vitos sells heavy duty kit that is made out of a brown paper bag. Regardless, it seems as if, it is what is advertised. Extra exhaust gasket (non-O.E.M.) and the triple head gasket. The base gasket and reed gasket are not necessarily normal either as they are sandwiched in a (sticky to the touch) black outer layer. I'll snap a pic of all the top end compared to after-market and stock, I have all. Anyway, I had multiple concerns about the head gasket. The ones mentioned in the start of the post and then also I recently thought hight as well, as the triple gasket is thicker thus raising head. I was hoping someone running this gasket kit would chime in.
 
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i have the cometic kit at home for the new motor i built but my motor was at kens being worked on so i havent installed it yet. i ran both the o ring and the other one and new once had a problem with it except no damn leaks.
 
Ok, here we go, cometic kit on left, bottom is some aftermarket (ring type exhaust, o.e.m. type head/reed, paper base gasket), The one on right is junk, but for comparison, it is all stock o.e.m. gaskets.

2mewh2q.jpg


My hope was some who are using the Cometic would chime in as they are so different. As far as I'm concerned, opinions on what would be best, or what your using are welcome too. I will probably run the cometic so was mainly curious about my concerns.
 
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I'd like to try em. I might have missed it but where did ya get them. Also do u know how what the stack measures????
 
The green base gasket has a bead of sealer built it. Cometic makes gaskets for just about everything and have been around just about forever. I doubt the head gasket would be of much concern, it might compress more after torque-down thus being equal to stock. If in doubt contact them for specifics.
 
Kgibson said:
I'd like to try em. I might have missed it but where did ya get them. Also do u know how what the stack measures????
Click to expand...

Here is a link, not the same seller but same thing

Cometic top end gasket kit Yamaha Blaster 200 YFS200 | eBay

The stock O.E.M. measured at 0.9 mm, the cometic with all three also measured the same. So I was wrong that it was thicker it is actually O.E.M. I was not extremely accurate but am sure they are the same

I bought this kit for base gasket as I no longer could find the cometic base by itself, I now plan on just running the whole thing, well, the exhaust gasket still has me stumped as basically it is in addition to the ring gasket? Atleast that's what it seems.
 
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A lot of engines use the MLS (multi layer steel) like the Cometic. I work in a machine shop and we build engines anywhere from Briggs and Stratton on up to Cat. Almost all the high compression performance engines we do we use the MLS like the Cometic. Duramax diesel engines use them from the factory. The copper gaskets are good too, though. Until the performance MLS gaskets became mainstream, copper gaskets with o-ring grooves were the normal setup for racing engines. Now we rarely see copper and almost always MLS.

From what I understand, ATV and motorcycle engines were some of the first to use the MLS gaskets. All I know is they work very well but so do the copper ones.
 
that is a cometic EST gasket set, it is what i use and it is simply a awesome gasket set and i wil never use anything else. they claim that u dont need to retorque the bolts and they are right, i never retorqued anything and there are ZERO leaks. also to use that silver exhaust gasket u need to make the holes bigger so it fits over the studs, it too works awesome lol I:I I:I
 
i like the idea of no retorque would still check it after heat cycles but thats me i would run it for sure.
i already knew that newbie swore by them that exhaust gasket seems like an awsome idea I:I
 
i would like to get me one of those exhaust gaskets. i never had any problems with the o ring ones but now that i have my paul turner it just keeps leaking.
 
super noober said:
that is a cometic EST gasket set, it is what i use and it is simply a awesome gasket set and i wil never use anything else. they claim that u dont need to retorque the bolts and they are right, i never retorqued anything and there are ZERO leaks. also to use that silver exhaust gasket u need to make the holes bigger so it fits over the studs, it too works awesome lol I:I I:I
Click to expand...

Yes, after checking I had to drill out holes for studs, So this works on top of normal gasket I take it?
 
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