Fuel issues....i think - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 8 (permalink) Old 09-04-2009, 09:58 AM Thread Starter
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Fuel issues....i think

SO i bought a 85 vn700 and it worked well after a new agm battery a r/r re wire and a set of ngk's. recently i rebuilt the carbs...what a bitch. now it seems like the front hole isn't getting any fuel and the rear is fouling plugs. this is strange because before i rebuilt the carbs the front was fouled and the rear was dry. the carbs are balanced. could the pet cock be messed up? is it possible that there is fuel flow going to one bowl and not the other? it starts and idles fin but has zero power when riding....it will barley accel even wot. any helpers?
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post #2 of 8 (permalink) Old 09-04-2009, 10:50 AM
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Do you know what shape the petcock screen inside the tank is in? Seems they can deteriorate over time. That may be allowing crud in the tank to reach the carbs.

You can check to see if fuel is coming through both nozzles on the petcock by removing the two fuel lines and pulling a vacuum on the center nozzle, but I suspect that's not where your problem is.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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Old Blue
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1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts

Last edited by flitecontrol; 09-04-2009 at 10:54 AM.
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post #3 of 8 (permalink) Old 09-04-2009, 11:42 AM
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I'm assuming you checked the tank and made sure it was clean and free of rust before you rebuilt the carbs right? It sounds like you've got a float issue. Just guessing so far...

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post #4 of 8 (permalink) Old 09-04-2009, 12:36 PM Thread Starter
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the tank is pristine with no visible rust...looks almost new inside. going to pull petcock tonight and check screen....don't want to have to pull carbs again...but if nothing else works....
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post #5 of 8 (permalink) Old 09-04-2009, 01:35 PM
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I'd drain the carbs into a glass to see if anything other than gas comes out, maybe a couple rounds of carb cleaner up and out through the drain before pulling and rebuilding. When I pulled my petcock out over this past winter I found that the upper screen was ok, not great, but the lower was completely missing the screen all together.

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post #6 of 8 (permalink) Old 09-04-2009, 02:04 PM
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If the petcock screens are bad, would probably be cheaper to install in-ine fuel filters than buy a new petcock. Easiest to do it with the tank off. May want to just install the filters if you don't want to pull the petcock.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #7 of 8 (permalink) Old 09-04-2009, 02:22 PM
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When you cleaned the carbs, did you open up the float bowls to clean the floats, pins, and passageways? I'm guessing you've still got some mung in there hanging things up - might need another carb pull, but it's easier the second time around!

C
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post #8 of 8 (permalink) Old 09-08-2009, 02:29 PM Thread Starter
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pulled carbs and petcock screen re cleaned and installed...now it runs like a raped ape
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