Re: a little help for a newb?
thatsdax.com does 4 stroke kits, mostly friction drives, never used em personally but the vibe i get here about them is they're pretty good.
mite want to check out their site or pm thatsdax here on the forums, he's usually pretty good about replying to people here.
i was talking to him about the new GT50R motor he has and he said he preferred it to even his own 4 stroke motors, mite want to reconsider where you stand after talking to him about his XC50S vs his GT50R and kit pricing.
good luck and welcome to the forums.