Aray,


I think I understand where that came from...

The first MVVS Q-500 engines were essentially normal MVVS .40 engines, with all the same parts, except for higher cylinder-sleeve timing numbers and the larger (old) #3219 carburettor.
It had the normal set of C3 rated bearings, like its regular .40-.49 siblings.

A large distributor of MVVS used to prepare the Quickie engines for higher RPM operation, by replacing the so-called 'normal' bearings, with C4 rated, phenolic retainer 32-38K RPM limit [link=http://www.wib-bearings.com/en/products/standards/st_2_roul_1_met.htm]Swiss WIB racing[/link] bearings.

This distributor no longer does this, since the Quickie now comes originally equipped with these exact bearings.

But the rumor remained. In the entire time I am dealing for MVVS, I got an order for one (1) rear bearing for a .49, that burnt up and needed a piston+sleeve too, after being used with very sub-standard fuel.

I hope this answers your question and relieves your doubts.