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Include the head gasket? Probably. An engine builder that knows what he is doing would use the tuning notes as a guide and not follow them to the letter. They will have decided on what state of tune they want the engine to be and build it to that requirement. Measuring everything along the way and altering things accordingly to get to that. You won't get the best out of the engine unless you treat it as a whole, from the air entry (carbs) to the exit (exhaust)And as for a 75mm skim, thats chopping the head in half....Finally, when you get the C.R. up to around 10 to 1 or 10.5 to 1 to suit the 2S cam you will have the problem of starting the engine. An engine in standard tune is bad enough on the leg muscles, a high compression 850? good luck with that.
Include the head gasket? Probably. An engine builder that knows what he is doing would use the tuning notes as a guide and not follow them to the letter. They will have decided on what state of tune they want the engine to be and build it to that requirement. Measuring everything along the way and altering things accordingly to get to that. You won't get the best out of the engine unless you treat it as a whole, from the air entry (carbs) to the exit (exhaust)
And as for a 75mm skim, thats chopping the head in half....
Finally, when you get the C.R. up to around 10 to 1 or 10.5 to 1 to suit the 2S cam you will have the problem of starting the engine. An engine in standard tune is bad enough on the leg muscles, a high compression 850? good luck with that.
