Oil trough the cyl casting....have you even heard of that (!)
Changing to an OHV engine seems indeed a much better idea.

I guess it's the M21 crank that does the trick. Lots of difference between an M20 and an M21 engine and there are just standard M20 cams in that engine.

Henk.

email (option): ahum@quicknet.nl

It's why I fitted an M21 crank to those crankcases I got from you Henk. It's still going strong and I still have that new B33 piston for maybe another day. I still don't ride much over 50mph, but the extra acceleration and pulling power is just nice to have. Ron

email (option): ronpier@talk21.com

The OHV motors are better in both performance and fuel economy...Even the B31 produces 30% more power than the M20 and will do over 50% more to the gallon....However, doing some work on the SV engine helps a lot, particularly if you travel any distance on your WD bike yet want it to retain it's original appearance and general feel...Ian

email (option): ian@wright52.plus.com