Hello fans of the air-cooled Yamaha RD 250/350. This homepage intends to find out how much a RD250/350 engines may perform.
Any measures presented has been tested.
I run this site to find a few like-minded people. I do not sell anything and have no business interests with this website. Contact me via email, use the form or discuss with me on www.rd350lc.de . I look forward to suggestions and will reply.
Do not start to widen the intake and exhaust port at first. Of all the measures I have tried, these have shown the smallest effect (+ 5%).
This is the list of successful modifications:
If that is not enough
Please take into account that the so modified engine is thought for classic racing on the racetracks. Each
bears the responsibility for themselves, in which chassis he inserts the resulting racing engine. However, should anyone come up with the idea to make one of the described modifications to a
vehicle that is to be moved on public roads, so check, if you need a technical acceptance of the modification by an authorized authority.