Stock head gasket on 68.25mm bore

[Yfs]

What would happen if I put a stock head gasket on a 68.25mm bore cylinder?

 

[jvb]

What would happen if I put a stock head gasket on a 68.25mm bore cylinder?

It would seal the head.

 

[Yfs]

I read somewhere that the gasket is a bit smaller is that true?

 

[jvb]

I read somewhere that the gasket is a bit smaller is that true?

Had no problems myself, shave a bit of the inside down
It will not hit the piston.

 

[Yfs]

Bit I already installed it and dindnt shave it down. My blaster runs I just don't know if it's something that will break it over time.

 

[jvb]

Bit I already installed it and dindnt shave it down. My blaster runs I just don't know if it's something that will break it over time.

No worries, it doesn't hit the piston and doesn't break.
It can cost you only a few pony's due to the intrusion of the gasket inside the head.

 

[Yfs]

Thanks a lot!

 

[jus_me]

∆∆∆ Won't run as efficient but it will run OK.. If you know someone with a lathe than they can turn it down/open up the gasket.... Or you could get a new one.... If you happen to be on the tight side of things, meaning your squish. Than you could get hot spots and end up with detonation ~~~ not good.. The gasket sticking out into the bore won't really have a chance to cool and your fuel won't burn so efficient.. All in all you will prob be OK since these things are so under tuned from the start.. But like as stated above, you may lose some hp.

 

[Yfs]

So it's ok if I leave it? It has prob 10 hr on it. And if I have to take it apart does it work to reuse the same gasket? And what is detonation?

 

[Blaaster]

Head gaskets can be reused if they are annealed properly.

I always say use a new one.

Detonation is caused by a too lean a mix which causes extreme heat which will attack the piston and cause it to melt.

 

[Yfs]

Head gaskets can be reused if they are annealed properly.

I always say use a new one.

Detonation is caused by a too lean a mix which causes extreme heat which will attack the piston and cause it to melt.

So I can just leave the gasket on the head then?

 

[Blaaster]

I misunderstood the question, yup leave it on there!

 

[Yfs]

Thanks a lot man! And I was wondering when using a compression tester what size tip does a blaster engine use and till haw much psi should it be?

 

[Blaaster]

Stock engine ideally 125 psi +

100 psi or less the top end needs refurbishing.

 

[Yfs]

Ok. I have a question about the spark plug. The kind I have now is a ngk bpr6es and they should have a b8es correct? Does it matter if I keep running the bpr6es?

 

[Blaaster]

In no way use a 6 heat range plug, b8es is the one.

 

[Yfs]

What if it has br8es does that still work?

 

[jus_me]

Br8es is perfect.. Basically the same as a B8es.

 

[Yfs]

Thanks I'll get one asap. Does it work to install a hour meter on a blaster?

 

[pudvah]

You can for sh*ts and giggles but leak tests an compression tests will tell you everything you need to know about the state of your motor​