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750GT valve clearances
Posted: Thu Nov 24, 2011 3:30 am
Hi. This may have been asked many times but I can't find it so apologies in advance. The original owner manual and other Ducati info states clearance for both inlet and exhaust is 0.10mm.
All aftermarket manuals I can dig up (Haynes, Cycleserv and other sources) state 0.10mm for inlet and 0.15mm for exhaust. What should it be?
Mine has screw adjustment, if it makes a difference. Apparentl;y some GTs didn't have shim adjustment. Thanks
Posted: Sat Nov 26, 2011 12:58 pm
Might answer my own question here: the best I can determine is that the original Ducati manuals are wrong (surprise!) and the exhaust should be 0.15mm ...0.006 inch. That does sound better anyway. Cheers
Posted: Sat Nov 26, 2011 3:40 pm
Ian Falloon's book quotes the factory clearances as does Mick Walker. I don't know where the Haynes manual gets its numbers. I do know that recommended valve clearances for desmo twins are all over the map so it all seems a guessing game or else there are a lot of self-appointed 'experts'. Surely, though, the factory must have known what they were doing???!!!???.
Posted: Sun Nov 27, 2011 9:21 am
You would be really hard pressed to notice any difference in noise or running with a .002" variance in the exhaust clearance. With the wear/slop in the rocker bushings and the ball of the adjuster the measurement will change a little every time the valve opens and shuts depending on the position of the rocker bushing.