Help finding base gaskets.

Trek 700c 100cc

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I have a A100 engine, it has a 49mm piston.

I found the cylinder with the gasket that matches engine stud spacing. But I need only base gaskets.

Stud spacing is 43mm.

There is lots of 80cc base gaskets and they are 45mm stud spacing.

And yd100 is different spacing.
 
This matches my motor.
 

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To better explain it, this will fit my engine. It's 49mm piston jug. 66/80cc with 43mm stud spacing.

They is lots base gaskets for 66/80cc cylinder but they are 45mm stud spacing and won't fit.
 

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That should take a normal 66/80cc base gaskets. Get the green gaskets if you can find them.
 
This is from a place I do not like, but I've always got my stuff I've ordered. This is a pretty good deal @$12 for a complete gasket set, with crank seals.
Screenshot_20231106-163227_Chrome.jpg
 
Boom Diggity, My gaskets will fit your bike just fine.

Made in USA, higher quality materials for a very similar price.

 
I have a A100 engine, it has a 49mm piston.

Thank you for response. I'll check out Mark20 gaskets later.

Thanx for all suggestions.

I found the cylinder with the gasket that matches engine stud spacing. But I need only base gaskets.

Stud spacing is 43mm.

There is lots of 80cc base gaskets and they are 45mm stud spacing.

And yd100 is different spacing.
Use a soda can, if you have the clearance for it. For the most part you can use a standard top gasket for your displacement, they are mostly universal, I port match my gaskets with a Dremel tool to maximize air flow, then clean the cylinder and oil the combustion chamber when your done getting the dust out, there should be ZERO color on a paper towel before you oil it for reassembly.
 
Use a soda can, if you have the clearance for it. For the most part you can use a standard top gasket for your displacement, they are mostly universal, I port match my gaskets with a Dremel tool to maximize air flow, then clean the cylinder and oil the combustion chamber when your done getting the dust out, there should be ZERO color on a paper towel before you oil it for reassembly.
Secondarily if you need clearance you can also use two lower base gaskets as well
 
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