No offence... and dont mean to discourage you.... but if it was me... I think Id sell it. and go buy a nice RZ350
thats just me...
But if you do decide to go on with it.
You will need some MASSIVE gearing change's. 1st will be high. Will need to re-work the motor so it will stay alive as a cafe bike
well im not gonna race it. just take it up in the twisties. the swing arm i have has a 17" wheel on it and a 38t sprocket. figured that would get me close to a top speed of at least 115 which is all i would need. i could get as low as a 35tooth sprocket for this wheel i have. but once i get into the engine ill start doing some research on the trans gear ratios. this is all just an idea as of now. im still trying to find out if i could even find a cafe style tank to make work with the kx frame, since the backbone is really high and at an angle. i also have a title on the bike and would like to use the frame.
if this is what you want... go for it Full bore. I was just stating my opinion. but it could be bias.. as I have a supermoto street legal K5 already. and have wanted a RZ350 for many years... (woudlnt trade my sumo K5 for one though).
In my sumo setup.. I run a 15-40. with my overdrive 5th (do a search on the site for overdrive 5th gear). and it needs more top gear
But will run along on the freeway at what I call "popping" speed. "pop,,,, pa, pa pop pop pop.."