It's an H89 head. Small oval, closed chamber. Production manifold, homemade air cleaner. I think the valves are larger than the GX head.
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I didn't realize the SU-type pistons didn't open up all the way when you floor the pedal
Actually, I think the pistons drop when you floor it. That's apperantly a draw back of constant velocity carbs.
I have to do this again. I've changed the damper oil from gear oil to 15w fork oil.
I'd like to snap pictures while i drive at a steady pace and see where the pistons are. Then actually stop and take notes. RPM, a/f, vac,
On that last video, I had forgotten what I had done by the time I got home.