Z1OwnersClub GB

Done shims on exshaust side.but when useing tool on inlet side when tool is in place i cant get cam lobe to a position where i can remove shim before piston will hit valve

All timing is correct and checked

Cant you rotate the engine the other way?

yes have tryed that.and if you do it with shim tool in place cam lobe will hit tool

if you rotate crankshaft clockwise until cam lobe depresses inlet valve fully, fit shim tool, then rotate cranshaft anticlockwise till bucket is held down by the tool and eventually cam lobe pointing upwards......the lobe doesn't go anywhere near the tool..............I've just done all mine this aft!

Thats what i meant but you expressed it much better Neal

PAULJAC47 wrote:Thats what i meant but you expressed it more much better Neal

cant rotate far enougth anti clock wise as piston hits valve

You have got something wrong here, start from basics again i say!!!

my self and stevieT spent all day checking and rechecking.
If no1 is at TDC and both cams are lined up corect where could it be wrong

the only way the piston can hit the valve whether turning the crankshaft clockwise or anti clockwise is if the valve timing is out of sinc have you removed the advancer + made sure the locating peg has not sheared on the crank .also put a screwdriver into no 4 cylinder + turn the crank until the screwdriver is at the top + see if the advancer tdc mark is aligned with the mark on the cover

Timing chain must be a tooth out - or you got wild cams

it only hits the valve a when tool is in place.while its in place i rotate the cam away from tool so as to remove shim.but before cam lobe is out the way piston hits valve.
if no1 is at TDC and cams correct.where could i have gone wrong

YES: The cam should be holding the valve open - then insert tool - then rotate cam so the lobe moves into centre of engine - towards spark plug/away from tool. Only turn motor over enuff to slide shim out.

My Mk.II has lumpy cams and you have to remove the cams to change the shims - and YES, they are over bucket-shims, NOT under-bucket

what type of valve shim tool are you using there are two different types + the 750 twin is very similar tool but is slightly longer if it is a genuine tool what is the part no

Its the std Z1 tool that I've used on loads of bike before inc Pigfords and Bunnyzs