I have a 6 hp robin eh-17 in my sons 03 xc 120 currently. I am contemplating putting a 11 hp robin eh-34 in it. The major obstacle is it is approx 4" taller than the 6 hp. I am confident I can engineer around this, but I am wondering if the extra 30 pounds is worth it. I am interested in your opinions and if anyone has tried an 8.5 hp or larger swap. I am looking for big power at reasonable price but sound levels need to be lower than those running full mod motors. Also, anyone know of a go cart tuner that messes with robin engines?

Thanks,
Snowman

Snowman, We are in the Milw area, have done kart racing engines for 24 years and build alot of 120 engines both snow x and ovals. We will have a booth at the Snow X races this weekend in Lake Geneva or see our site www.4cyclecentral.com Bob