when the top end of the 250 engine (actually a cb250rs engine) starts to rattle, how long do i have left before it lets go? and how does it tend to let go? It tends to rattle at low revs when pulling away.
I'm planning on fitting a larger engine when i can find one, either FT or preferably xl or xr due to kickstart. Do these swap into an XL relatively easily? I know they're a bit tight on space at the top, but i have access to skills and facilities to cover it all.
thanks in advance,