bought drr50 have few questions TOP END

[ironarmscott]

New to the drr world
Bought a drr50 air cooled and they told me it has a 70 upgrade kit question is how can I tell and there is little piston slap with small skor on cylinder if you look up plug hole. Clutch seems good just want to know how to tell if it is a 50 or 70 and where to get a top end thanks

Also bud gave me a mint arctic cat 90 engine to drop in what is best clutch set up for this engine thanks

[Abennett]

Only way I know to tell the difference is measure the cylinder bore, G Force or Hot Quads would be a good place to start for parts,

[Hetrick Racing]

50cc cylinder stock is a 40mm bore 70 kits vary a bit but 47mm is usually the small 70 kit there were some old 46.5 and 47.4 stuff but most of that has diminished. 47.6mm is everything else.
There are a bunch of cyl. kits and pistons so make sure of your spec.
We also have parts lol

[ironarmscott]

thanks for the info