Hey has anyone heard tryied these engines yet?
the .21 onroad 7 port looks interesting , here;s the link:


http://www.spmracingparts.com

i got this from a UK based onlline shop

"...this high perormance engine produces the same power as its rivals but at 8000rpm less, this result in amazing levels of torque capable of slipping a 3 shoe centex clutch!..."


Constuction: ABC
Carb: Aluminum
Head Size: Low profile
Head Colour: Gold
Capacity: 4.38cc
Ports: 7
Stroke: 16.5mm
Bore:16.4mm
Crank: 14mm SG
RPM: 37,000
HP: 2.5
Weight: 340g


Specs look good

4.38cc´s

can not be they only makes 3,49cc´s

are you sure?

I highly doubt that is true, plus it's already kind-of wrong anyway - a clutch is designed to slip, but how much depends on the material and gap.