hi guy first off my name is Juan , great site looks like every one is pretty helpfull always a good thing .

my problem is i just picked up a Kinlon supermono, mainly got it for the front end to motard my klr250,
but... the bike is mint and i dont want to wreck it out for parts if it is an easy fix ,

the bike at idle has a very bad knocking sound and does this in first and second , but trying to get in the back yard after a test ride , 3rd didnt hook up and the knocking noise went away and the bike idles and revs out smoothly and clean , but roll back 10cm and i can hear grinding like the gear is trying to engage ,
so i am at a loss is it a main bearing or has something in the box gone boom?
looked every where and cant find any info on these engines have any problem simlar to this ,
any help would be great

bit of back ground the original owner says he kept up all the services and was just a bike to do a 80km round trip on every week day.
then he says it went boom when he was riding and he got it droped off at his house,
27000 on the clock ,
hope that helps,