Engine Mods

Posts: 80

i have a joyner 250 and i want to mod it out i have been looking into mods for months now but im ready to finally put them on any last suggestions for mods i want top end speed without much loss of accleration or hill climbing i ride on hard packed dirt and some hills and suggestions for mods im looking for engine mods and elctronic mods also i want a winch eventually and idk if there are governors or rev limiters on the joyner 250 any help on engine mods and electronic mods would be greatly appreciated

Posts: 4279

the cdi limits rpm and timing. you can change it to get more rpm.. but if you are not hitting the limit now then I would leave that alone.

as far as the cvt mods go, you can do 17 gram sliders, a main spring. that will help low end and still retain some top speed also.

Posts: 80

ok thanks so far down hill my fastest was 47-48(the speedo says 57 but had car next to me) and on flat land 45 i want to try and hit 50 is tht possible

Posts: 4279

its possible, you would have to go with a 24-26 gram slider, and a main spring. take off in high gear would be sluggish

Posts: 1889

I think you should stay with the stock rollers/sliders, update the intake and rejet your carburetor. The extra breath the engine will get, should push it faster. At a certain point, it doesn't matter what size weights you are using because the variator is at it's maximum and the only thing holding it back is more engine output.

Posts: 255

I swapped out my CDI and couldn't tell much difference. I also put on a high output coil, K & N filter, 32 mm pumper carb, 15 gr. sliders, and blue torgue spring. I have not changed the clutch springs. We crawl around on rocks some and the lower engagement speed seems to work well. I also put 23 x 8" tires on the front to roll over things easier. Next time I think I will go to 24 x 7" tires. The rear tires are 22 x 11" Interco Swamp Lites. You could get a higher speed with taller tires, but I love hillclimbing and didn't want to loose any low end. I am constantly amazed at this buggies climbing ability. It doesn't stop climbing until the tires start spinning.

Posts: 80

so you guys r sayin rejet carb uni airfilter with redneck intake spring and thats about it

Posts: 4279

thats one way to do it, the stock rollers are kinda heavy, open up the air and exhaust and that will make a big diff also