cylinder base gasket

When you're replacing the cylinder base gasket, can you just slide it on and put the cylinder over top, or do you need to put some kind of gasket product on before ? Also, will an engine run without a base gasket ? Thanks!

Re: cylinder base gasket

no the engine will not run w/ out the gasket. u can put some of the gasket stuff on(i find it better when i do that). well theres ur help.

-mike

Re: cylinder base gasket

when i got new piston rings i had to replace my base gasket too, i tried a piece of bristle board and it has worked ever since

Re: cylinder base gasket

You don't have to use a gasket product at all... but if the gasket is used and torn... the gasket goo (like high temp RTV) will probably save your butt (but of course you should really buy a new one..they're cheap)

The gasket product will also save you if you have some metal damage on one or both of the surfaces... don't use too much though.

I have no idea what bristle board is.. (cardboard?)

You can make your own base gasket out of cardboard... (like a cereal box)

They will even last a long time...(I wouldn't use it for the head gasket unless it is an emergency though)

If you do make your own out of cardboard... make sure you trim it nicely so that it doesn't stick into the air flow inside the cylinder... the outside is not so important.

One tip if you are using a new base gasket... Smear it with grease and let it absorb the grease for a day before installing it... then it will last "forever" because it won't stick and tear the next time you take it off.

Will it run without a base gasket ?... maybe if you use the RTV on it (You DO NOT want an airleak there ...it is a guaranteed seizure)... but it will almost for sure make your top speed slower.

Re: cylinder base gasket

i blew a head gasket on a motobecane and didnt want to wait for a replacement so i went to a hobby store and got some thin sheet copper. it took four thicknesses to mic the same as the old one, but it runs fine.

Re: cylinder base gasket

On my Kinetic Tfr i took both the head and the base gasket out and replaced them with rtv silicon gasket maker. It definetly helped my torque and acceleration but i don't have a speedometer so i don't know what it did in terms of top end, im gonan be checking my top speed soon though, ill keep u posted.

Re: cylinder base gasket

Ron Brown /

Fred,

You forgot to mention that if you are not replacing the cylinder and it has a wear ridge at the top, you must maintain at least the same thickness of base gasket or the rings will hit the wear ridge. Not good!

Ron

Re: cylinder base gasket

Yeah... But Ron I've never seen a wear ridge at the top of a two stroke cylinder.

I have only seen it on high mileage 4 strokes... like 80,000 miles on a car... most of these peds have ... What?... 3000 miles on them?

I think most 2 strokes will have worn out bores before they will get a wear ridge.

To the guy who asked... Hey... stick your finger in the top of your cyl and feel for a ridge.

If you've got one... Maybe stick with the original gasket thickness.

Re: cylinder base gasket

Ron Brown /

Fred,

You could be right. Damned if I can remember seeing one either. I'll keep my finger at the ready and report back at the first instance.

Ron

Re: cylinder base gasket

Reeperette /

I think I'd best check mine....not that it takes a gasket, but she's got 20,000+ miles on her...is this somethin I need be really concerned about ?

-Ree

Re: cylinder base gasket

Ron Brown /

Ree,

If your base gasket leaks, you will see oil seeping out in significant quantities as the crankcase is a pumping chamber.

If you don't see this, t'aint broke, don't fix it.

Ron

Re: cylinder base gasket

Concerned about what?

A ridge or a gasket prob?

As far as a ridge goes... if it runs good you don't have a problem.

Re: cylinder base gasket

Reeperette /

Ok, Just wanted to know if a wear ridge was somethin to worry about, my Targa don't have a gasket.

I missed a damn obvious thing to do somewhere in there, and the mileage counter brought it back to me, though - those rings are prolly half-shot.

Any idea how long pistonrings last if you don't ever seize ?

-Ree

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