Funny fuels is adding Klotz Nitro and upping the jet sizes, correct?

 

so if i have a port & pollish on the valves and have bigger valves. A 686 piston at 12:1 compression. what hp would that put out? also new clutches, No air box and a yousie titanium full system? I amlooking to beat the shees on Colorado Hill Climb Ast. these races are like pikes peak if yall have heard of that. i just want to show them that 4-strokes are not slow and "dumb"

 

Klotz Nitropropane mixes with gas, you could also run alky and add nitromethane.

 

"funny fuels" is a nitro, NOS, ethanol, or methanol. as far a 686 with the yoshi i would say around 55-60hp. it all depends on who did your head, and what cam your running. but the yoshi is a decent pipe for a 686. but change your rod if you do so.