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UPDATE: I found the souce of the surging. The float bowl vent tubes were routed down behind the engine. Storloc had posted a picture of the tubes connected to the top of the airbox. Well I connected the vent hoses to the airbox. I rode the bike to work this morning and the surging is gone...

Update: I checked for a vacuum leak- none found. One thing I'm not sure of. The carb vent hoses for the front cylinders feed down behind the rear of the engine. The rear carbs don't have hoses on them. Now there are 2 nipples on each side of the air box. Are the carb bowl vent hoses suppose to...

Thanks for all of the replies. I'm going to check the intake system below the carbs this weekend. Has anyone used a smoke machine on the Vmax to check for vacuum leaks? Thanks, Jim

Other things I left out: I replaced the fuel filter & synched the carbs. I do feel the Vboost kick in @6000 rpm. I placed the small washer as a spacer in the needle jets and it was still the same. The"Y" is stil intacted on the airbox. If there was a vacuum leak in the rubber intake boots...

I have just bought a 86 Vmax. It was sitting for 2 years. It has 12,000 miles. It is stock except for a k&n air filter. The carbs were overflowing fuel out of the vents when I first tried to start it. I took the carbs apart, inspected & cleaned them. checked float level: level is correct (I have...