VM carb set up

[Wallowgreen]

Thanks for all the help and suggestions chaps. Ordered a Morgan carbtune and colortune as a package today. Plan to do the tear down and rebuild over the Christmas break so I'll let you know how it goes with the new gear.

[Nessism]

Really? I've never seen anything but good said about the Carbtune. I swear by it. I always had a slight vibration from my 1150 that I couldn't get rid of....until I bought the Carbtune. The 1150's carbs are super-sensitive, and my old mercury sticks would not dial them in well enough. I don't see how any other synch tool could be more accurate or user friendly.

As far as the Colortune, I have one of those, too, with plugs for both my bikes. For me it seems to work well on the CV type carbs, but not as well on the VM's. They are good for getting your pilot settings close, but I think reading the plugs is still the only way to get everything spot on.

Oops, ment to say Colortune has received mixed results. Carbtune feedback has been steller.

[Steve]

This is most probably a stupid question but aren't VM carbs mechanical? If they are, how is it that if they're bench sync'd correctly, would they need to be vacuum sync'd with a manometer since all the slides would be moving at the same rate?

Actually, if you look at the CV carbs, the part that actually causes the vacuum is mechanical, too.

The vacuum-operated slides do nothing to cause any restriction (therefore, vacuum) at idle and low throttle openings. It is the mechanical butterfly-type throttle blades that are adjusted during a sync, whether it's a bench sync or a vacuum sync.

With either set of carbs, the bench sync only gets the throttles rather close, the vacuum sync is what really sets them correctly.

By the way, congrats on your new toys. Feel free to ask for help on how to use them when you get them.

.