OK so yeah played this game.
I used RD50 piston. There were two types over the years. One had 1.2mm rings and could take the revs the mb50 piston never could without flicking off a ring tip. Power would drop off. With monotonous regularity. B
RD piston could take 12000 peak power + over rev no drama.
But 3 mods required. You had to run thrust washers either side of the pin as the Rd piston allows the mb bearing to travel sideways.
2 you have to trim the bottom so it doesn't hit the webs which means cutting the whole window area out. These days I'd rebuild with a longer rod. If you could use a yam one you might not need the thrust washers.
Next you need to move the ring peg. Send it to Pete at Total motorcycles in Palmy.
Set the barrel for 128 transfer and 196 exhaust and skim the top. 15:1 on 98 should be okay or 16 on Ave.
I welded on a jacket to the head and thermosyhnd (sorry spelling. Been drinking) with a rg radiator.
Much more from chassis modifications to make it actually behave.
Yeah and as Mike says I built a crank with Long brand rod. Not a good ending. Bit like the picture Mike uses for his avatar.
Don't you look at my accountant.
He's the only one I've got.
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