Mebbe you can enlighten me on the reliability part? I know China H.T. kits are junk and will not argue that... Erm'm I don't use thoseI've put a number of miles on both, I prefer the 4-stroke. The 2-strokes are compact and make nice power for their size, but the 4-stroke has it beat in long run reliability.
GearNut,I have both.
I really like the power that the 2 stroke puts out. I don't like the cheap bearings and nearly non-existent quality control that it was made with though.
I really like knowing that my 4 stroke will last a long, long time without any modifications necessary. It is quieter, requires less maintenance, runs smoother by a huge margin, and so far has been much cheaper to operate, though it cost more initially to get.
what bike engine are thinking thats that powerful and small? im looking into new engine optionsif we are talking about kits 2 strokes vs kit 50cc 4 strokes, 4 strokes have about the same power, are bigger and more expensive, but much more reliable. the 2 strokes look better, too. i am still building my 99cc predator. the disadvantages are size, weight and price for the drive train, to be expected because it's not a kit. they are cheap to replace, only $100. tons of power and reliability. i have a 2 stroke 125 dirt bike and love it, i like the sound and power. super light, too. the only good 2 stroke for motor bikes is the morrini and similar engines that cost more than $400. i've never rode one but i like manual clutches so i will never buy one. i am thinking of using a 65cc dirt bike engine for my next build, they are super light 5 speed manual 14hp screamers. i will buy a bike and part it out, possibly getting the engine for free plus my labor. i calculated it will have a better power/weight ratio than a kawasaki ninja 250.
bottom line, it's personal preference. what kind of performance do you want? what is your budget? what skills do you have?
May not find a Morini any more can try one of these. Dax GP50 R KTM clone. Chinese version. Not a Kit and I suspect may be harder for the wrong fellow to fine tune? In which case a 4 stroke kit may be better? http://thatsdax.com/a morrini will do it.
I have a HuaSheng 142F which is a clone of a Honda GXH50, both 49ccGearNut,
What motor would you recommend and is it spindle or chain driven?