performance mods

Hey all, Newbie here!!! so just my second post, in need of some answers again. Something seems to be locking up on my Colemanbt200x when I let go of the throttle. It brakes itself to almost a stop, not in a jolting kinda way, more like a slow self brake, like a car going down a hill in a low...

Hello, I've got a Coleman ct200u with the stock clone engine. I added a .035 rejet kit, hi-flow air filter and ARC racing adapter. Also have a custom straight pipe. I feel that I need some more power, for what i'm doing with the minibike. My friend did a pretador swap and now he almost beats...

Aight bros After poppin off the valve cover on my hemi predator and seeing the rocker arms on it I was kind of sad that i couldn't find that style in 1.3:1. I wondered if the old style predator head would fit my engine, or even a smaller gx series head, but I read somewhere that the old style...

I bought a 94ss cam and 22lb springs from dyno cams and installed it in my motor. Stock crank,rod,piston,valves. slightly ported intake and exhaust and now i cant get it to idle or run very well. (timing is definitely correct). I have the stock pulsa jet carb with a fixed jet :/. What can i do...

ok i bought an intek 6.5 hp briggs and stratton and it did not have a govener so if i run it past 3600 rpm and float a valve how much of a risk am i at of punching a hole in the piston? and if there is a risk were can i get higher pound valve springs/cam/pushrods? i found peple saying animal...

So I got the motor from a friend and it ran but it had been sitting for a while in the rain and shit so it needed to be cleaned up.. I cleaned the carb, than I removed the governor and put a screw in the top of the block.. Next I began to get a throttle linkage going.. Put in a new return...