As I dont have a tacho on my bike and it seems to run low gearing I did a check this morning .

I removed the spark plug and wound the engine over to check how many revs for one rear wheel rotation , then checked tyre circumference by rolling it along the yard - end result is that at max power 8,500RPM I should be doing 72mph according to my maths .

Does that sound about right and what revs do you let your 230 engines go to ? - guess if 8500 is max power 9000rpm should be "safe" ....

Still running in so not been over 50mph but even that felt like a lot of revs but maybe it is in comparison with my 604 Rotax powered CCM ?