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Oxygenated fuel in saws do’ And don’ts

Stihlbro

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So you have replacement jets in the carburetor? What is the size of a gas jet compared to what is used as an alcohol jet?
 
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There’s no head to shave which y’all are all used to but merc did is a favor and in 1989 redesigned the combustion chamber to be swapped out with older 25xd pistons to run 200 psi. There are also windows to get to transfers. There’s a big void behind the reed block that needs to be packed with marine Tex to up the crankcase pressure. adding a spacer in between the water jacket isolation cover on the exhaust side as well as cutting the exhaust tuner to 4 inches long. Widthen the exhaust port don’t raise it since it’s only 18ci. It will pull an 18p chopper 7k in a light inflatable
 

Stihlbro

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Does it have a external fuel pump? Float type carburetor?
 
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I don’t remember sizes off hand but numbered drill bit was probably 5-6 times I had to drill until it was happy
 
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External dual pump built into the carb and yes a bowl that will eat the needle tip and seat a lot running methanol
 
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