rednecktech Posted May 30, 2005 Share Posted May 30, 2005 My question is about manifold vacuum on my triple 750. What is the factory vacuum settings when the bike was new. I only have 8200 miles on the bike but the carbs are from another 750.When I bought the bike I found that the needles had been screwed in so deep that the tips were broke off in the bottom of carbs.So I bought a parts bike with good carbs, and they have been reset to balance the vacuum. They are way off in balance,so I set the vacuum balance to 8inches of vacuum with a sync.tool. I'm thinking that it is to lean at this setting. It's a little slugish right at take off,but gets after it with a little more throttle. I don't know whether to go up or down with the vacuum. The bike is a 1978 Yamaha750 Special XS model. If anyone has the answer please pass it on ,thanks,Jim Link to comment Share on other sites More sharing options...
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