Quick question

GoldenMotor.com

dreadlord69

New Member
Aug 28, 2012
8
3
3
Philadelphia Pa
Ok, I am doing a rebuild, but the gasket that sits below the cylinder was lost. Which brings me to my question can I use a liquid gasket there? will it hold to the compression on an 80cc Chinese happy time. Any replies would be appreciated.
 

paul

Well-Known Member
Dec 23, 2007
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Kalamazoo, MI
i would probably get gasket material and a razor blade and cut my own gasket. i only tried the liquid gasket once and it made a heck of a mess
 

Ludwig II

Well-Known Member
Jul 17, 2012
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UK
It's possible to lap the joint in by careful use of grinding paste between the barrel and cases, so allowing you to use a gasket paste, but you'd have to be sure no grit went inside the engine for a start and clean it all off after doing the job. Then there is also the question of altering transfer port timing because the barrel will sit a small but measurable bit lower than it did.

You don't have to have the part from your supplier though. There is a gasket material supplier in most towns that will sell an appropriate sheet you can cut to fit.
 

CroMagnum

Member
Sep 2, 2011
148
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Los Angeles
A new base cylinder gasket costs around $3. So instead of spending all that money, you want to Mickey Mouse something that will probably leak? :confused:
 

Ludwig II

Well-Known Member
Jul 17, 2012
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Not necessarily Mickey Mouse, I have friends who do all that hand finishing as a matter of course, but as you say, why bother with learning the hard way when bits are cheap?
 

tooljunkie

Member
Apr 4, 2012
663
5
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Manitoba,Canada
for me,the need to cut gaskets is quite often,working on obsolete things.
that and getting gaskets for these things doesent involve a ten minute drive to the local parts store.
i have never had any trouble with my hand forged gaskets.
the trick is to use the correct material for your project.
when purchasing,explain you need fuel resistant gasket material.
i never checked,but i'm sure there will be something on youtube for cutting gaskets.
i could go on about various methods,but it would take a lot of typing.
if it doesent exist,i will put something together.
 

2door

Moderator
Staff member
Sep 15, 2008
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Littleton, Colorado
I'm waiting for someone to tell him to J-B Weld it. :)

Actually I've done several using the method suggested by Ludwig. The gasket surfaces must be clean and flush with each other and a gasoline compatible sealer used. I've never had one fail yet. The difference in cylinder height with or without a gasket isn't enough to worry about compression or port timing. Not on these little Chinese 2 strokes.

Tom
 

Ludwig II

Well-Known Member
Jul 17, 2012
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The difference in cylinder height with or without a gasket isn't enough to worry about compression or port timing. Not on these little Chinese 2 strokes. Tom
Try it an a 4 stroke with a lumpy camshaft.
 

Ludwig II

Well-Known Member
Jul 17, 2012
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I know this. I've had East European 2 strokes that needed to phone the cylinder head, the pistons were that far away.