Hi All Thanks for the welcome, Yes i remmber there mochecks 400 + was it 460cc and race bikes back when i whent to races.
I all so hope it is just the seals, the comp is 105 to 110 in the cyls the rings are ok. put oil in and still low comp so must be valves, or the seals at this age 32 years old, mind they whent after a few thousand miles from new this has all ways been there bug, and jummping out of 3rd over 6500 rpm my 1st one dose this so had to short shift 3rd. 2nd one seems ok at this time phew. Did read some where many moons ago some one did a mod on 3rd ie under cut the gear or some thing like that to fix the problem.
Ref the bike been around longer fully agree i shall keep mine till i can not get on them or there is to much dribble down my front it blows up and cant see where iam going te he.
Any way must go to work now on nights for a few weeks.
Paul