I didn't see these posted anywhere so I thohght I would. My old clymer manual has a bunch of info on port and piston modifying and was curious if this info is outdated or still holds up. I'll attach some pics of the port maps and piston diagrams. 20260521_184000.jpg20260521_184006.jpg20260521_184053.jpg
The top one is supposed to be a stock RD350. The lower one is a full production race TR3 porting. Do not attempt to port an RD to TR specs.
yeah ive heard that before. its a cool peice of history though. the old performance sections on manuals is a riot
Funny to think how many people just went for it. Has some useful stuff about beveling the oil passages on the crank and other simple stuff