Ossa tr77 350 over revving

[bikeskint]

Hi just picked up a 1978 tr77 starts lovely  and idles nicely BUT after a few minutes it will pick up the revs to almost maximum without any input without sounding dense where do i start?

[lemur]

Uncontrolled acceleration can be caused from intake vacuum leak.

... that is where you have a very small air leak type hole somewhere between the carb and cranckcase.

Edited 5 hours ago by lemur