Base gasket question

sherron82

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If I'm using the shims do I still use a regular gasket as well and if so what order. As of. Ow I have a regular gasket then the aluminum shim. I had sanded down the cylinder to get a better squish but now I need to use the shim . Also what does raising the port timing mean exactly? Sorry may be a dumb question but I'm new to all this. Does it increase the power?
 

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On my engine I use no base gasket…10mm spacer..
.1 to .5 shims for squish
Motoseal instead of gasket
 
Minarelli conversion
I think this one has no shims
Just motoseal
 

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This engine needed all the kit shims and a gasket to make the squish correct.
These chinese cases can have deck height differences of 1mm or more.

I use a block to lightly water sand #360 - #600 grit..plane the case deck for imperfections..make it flat.

Then sit the spacer and cylinder on top..check the squish spacing. Then go from there with additional shims.
 

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