Hey Shadow, have a look at this:

MVVS 35 IFS - Walbro cat. #3098iW ; the versatile workhorse.
3,10 kW @ 8 500 rpm (4.2 hp)
weight 1493 grams without ignition
Ignition weight 160 grams
Fuel: petrol, unleaded 95 octane (US: unleaded premium gas 91 pump octane).
High silicon, molybdenium plated piston with cast iron piston ring, running in a hardened steel liner
Use only: Jaso FC+ or ISO LEGD class two stroke fully synthetic oil. Mix at 1:40 (running in 1:30, during the first few gallons)
Bore: 36.5 mm Stroke: 35 mm
Suggested Props: 18x10 to 21x10 or 22x8
MVVS 35 IFS
Plugs NGK CM6,
Typical rpm figures:
Prop. RPM Exhaust
APC 20/8 7600-7700 3268
Mejzlik 20/10 7200-7300 3268
Mejzlik 20/8 8200-8400 3268
Mejzlik 21/10 6600-6700 3268
Mejzlik 20/8 7100-7200 3268
Mejzlik 20/10 6300-6400 3271
Mejzlik 20/8 7300-7500 3271
Mejzlik 20/8 6700-6800 3298