Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums - Reply to Topic
Carbs and Fuel System
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Thread: what should i do? what should i do? Reply to Thread
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  Topic Review (Newest First)
05-04-2007 05:23 PM
93VN750 Fegry you points about vacuum leaks are worth checking before anything else. Good ideas there.

Jon
05-04-2007 04:45 PM
fergy Choking the carbs cuts off some of the air getting to the combustion chamber, resulting in a richer mix. If adding choke eliminates your hesitation, then it sounds like your hesitation is caused by a lean mix, or too much air (or not enough gas) getting to the combustion chamber.

The first thing I think of when dealing with a lean condition is vacuum leaks. That's because there are so many areas that can leak vacuum, i.e. pinholes in vacuum hoses, cracked and old rubber manifolds (carb mounts), even rubber vacuum port caps get old and cracked and leaky. Also, if your air cleaners have holes torn in the foam, it will change the air pressure coming through and will effect your performance.

If it is caused by not enough fuel, then your fuel delivery system is suspect, petcock, screens, fuel hoses, carb floats, float valves, etc.

Sorry Jon! I just realized I posted this without seeing all your responses above. I'm not sure how I did that, but I'm on some really strong pain meds since yesterday and I guess I can blame them! Looks like you have this one well under control.
05-04-2007 04:14 PM
93VN750
Quote:
Originally Posted by free wheel-e View Post
doing it as we text. do i have to remove the carbs to adjust the float level? thanks john
Actually you have to have them installed to do the measurement, they need to be removed if they have to be adjusted.

Do you have a Clymer's or Kaw seervice manual? If not, perhaps I can send you the pages referenced to due the float level measurement.

Jon
05-04-2007 04:08 PM
free wheel-e doing it as we text. do i have to remove the carbs to adjust the float level? thanks john
05-04-2007 03:39 PM
93VN750 With a pure stock intake system, you should be fine on stock jetting. You might want to check the float levels in the carbs, if too low, it will starve for gas in high demand.

Have you already done the Seafoam treatment?

Jon
05-04-2007 03:17 PM
free wheel-e intake is pure stock. just an FYI have V/H cruisers on the other end
05-04-2007 02:19 PM
93VN750
Quote:
Originally Posted by free wheel-e View Post
it happens on full throttle. how do i richen the fuel mixture on thes carbs? thanks john
First, is your bike stock? If not, what changes have been made, only care about the intake side.

Jon
05-04-2007 02:03 PM
free wheel-e it happens on full throttle. how do i richen the fuel mixture on thes carbs? thanks john
05-04-2007 01:49 PM
93VN750
Quote:
Originally Posted by free wheel-e View Post
here is an update to my hesitation problem. went out today and it started to hesitate on hard acceleration. decided to add a little choke & the engine smoothed out and acceleration rate increased? now my question is what is the problem with my fule system if to correct it i have to give it a little choke so it runs good? thanks, john
Since it appears to be running lean you could check the float levels to make sure they are right.

If the bike is not stock on the intake side (other than maybe K&N filters), you may want to richen up the carbs a bit. When does the hesitiation kick in? Certain rpm, part throttle, full throttle, ??

Jon
05-04-2007 01:40 PM
free wheel-e here is an update to my hesitation problem. went out today and it started to hesitate on hard acceleration. decided to add a little choke & the engine smoothed out and acceleration rate increased? now my question is what is the problem with my fule system if to correct it i have to give it a little choke so it runs good? thanks, john
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