Growing up in the early 70's there was a kid on our street that had a boonie bike. I was so friggin jealous!
Yours looks awesome! Now I'm jealous of yours lol
Side popper, with a HS4 cam in it. The exhaust port will be the intake port, and you fab up a cool looking intake/carb facing forward. Just to be different.
Tig weld all the bolt holes closed, drill to correct pattern. Then reface for flatness. Yeah I know, not worth it. But that head is used on engines that make pretty good hp for a stock flat head.
When I was a kid back in the 70's I tried advancing & retarding cam timing by one tooth.
Started and ran, but not much difference from stock.
Also tried the lighter flywheel from a rotary lawn mower. That made a difference in acceleration, but really hard to get running.
If water was sucked in, the connecting rod would bend or break first. I bet the valve was stuck open, and someone tried to free it, tapping with a hammer & screw driver through the spark plug hole.
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