What's the best way to check the valve timing on a twin with the engine in the frame (can't reach the upper valve caps/covers).
The cams are Gary Robinson's 105.
Timing is stated as I.O. 47 degrees btdc - lift 5 thou with 2 thou nip.
I checked it previously with a dial gauge on the pushrod end of the rockers, but I suspect that it's not quite right as the engine is popping and spitting and the exhaust has a very harsh tone.
Is the 'on the rock' method suitable? if so can someone talk me through it?
Thanks.
The cams are Gary Robinson's 105.
Timing is stated as I.O. 47 degrees btdc - lift 5 thou with 2 thou nip.
I checked it previously with a dial gauge on the pushrod end of the rockers, but I suspect that it's not quite right as the engine is popping and spitting and the exhaust has a very harsh tone.
Is the 'on the rock' method suitable? if so can someone talk me through it?
Thanks.