Won't idle and no power. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 22 (permalink) Old 07-06-2017, 07:28 AM Thread Starter
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Won't idle and no power.

I had the tank off yesterday. Didn't touch the petcock or anything else. Only thing I did was replace the hose running from the carb t-junction to the right air filter box / ear.
Today I took it for a ride. Ran great at first. Better actually, than it did before. Then after about 5 miles it had trouble idling. Tried adjusting the knob a bit, but no luck. It would idle really high when moving and then just die when stationary.
Pulled into a parking lot after a couple miles. It died and would start again. Let it sit for about 10 minutes and then tried it again. Got it started but not easily.
On the way home it had the same idle problem and it wouldn't really move. I at about 1/3 - 1/2 throttle it seemed to just stop. It would continue revving but nothing would happen. I had to have it in third gear just to barely hit 30mph (didn't try going faster than that).

Any idea what is going on? Last night there was no problems and now it is basically un-rideable.

EDIT: Not sure if related, but when I got it started, there was a bit of smoke from the exhaust (black'ish). Not much, but I can't recall it ever doing that before.

Last edited by Biking Viking; 07-06-2017 at 08:13 AM.
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post #2 of 22 (permalink) Old 07-06-2017, 07:57 AM
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You may have a vacuum leak. Spray some wd-40 at the vacuum hose and carb boots, see if the engine changes sound. Not into the air intake.

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post #3 of 22 (permalink) Old 07-06-2017, 09:01 AM Thread Starter
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Quote:
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You may have a vacuum leak. Spray some wd-40 at the vacuum hose and carb boots, see if the engine changes sound. Not into the air intake.


Nothing that I can see. And none of those have been touched.
Granted, half of it is hidden so far in that I have no way of seeing it without removing the carb. And that is not a job I am anywhere near qualified to handle.
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post #4 of 22 (permalink) Old 07-06-2017, 09:14 AM
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You can't "see"an air leak. And you do not need to remove the carbs to check for one.
Did the hose you replaced fall out? Did you cut the end going into the air box at a 45 degree angle?

Is your tank full? (POOGS) Bad fuel?

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post #5 of 22 (permalink) Old 07-06-2017, 09:19 AM Thread Starter
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Quote:
Originally Posted by Knifemaker View Post
You can't "see"an air leak. And you do not need to remove the carbs to check for one.
Did the hose you replaced fall out? Did you cut the end going into the air box at a 45 degree angle?

Is your tank full? (POOGS) Bad fuel?

The hose is exactly where it was and is cut at 45 degrees.
The tank is completely full with fresh fuel, pumped today.
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post #6 of 22 (permalink) Old 07-06-2017, 10:13 AM
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EDIT: Not sure if related, but when I got it started, there was a bit of smoke from the exhaust (black'ish). Not much, but I can't recall it ever doing that before.
Black smoke means it's too rich, flooding.

An air leak will make the carbs lean, instead of rich.

You can check the petcock vacuum line to be sure it's dry. Otherwise, you'll need to find which cylinder is rich and check out that carb, checking the plugs is a good start.

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post #7 of 22 (permalink) Old 07-06-2017, 10:31 AM
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might be a dirty float needle.can try Wolfie's blowback method.it's a sticky in the fuel and carbs section

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post #8 of 22 (permalink) Old 07-06-2017, 10:31 AM Thread Starter
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Quote:
Originally Posted by Spockster View Post
Black smoke means it's too rich, flooding.

An air leak will make the carbs lean, instead of rich.

You can check the petcock vacuum line to be sure it's dry. Otherwise, you'll need to find which cylinder is rich and check out that carb, checking the plugs is a good start.
The bottom one is the vacuum, right? It appears to be dry. Took all 3 off and the left and right ones had a bit of fuel run out, but the bottom one was dry.

As for the flooding/smoke. Couldn't that just be from trying to start it for several minutes?
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post #9 of 22 (permalink) Old 07-06-2017, 10:41 AM
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The bottom one is the vacuum, right? It appears to be dry. Took all 3 off and the left and right ones had a bit of fuel run out, but the bottom one was dry.

As for the flooding/smoke. Couldn't that just be from trying to start it for several minutes?
Bottom, or center port is vacuum.

Smoke could be from extended cranking, especially if the choke was used any. When it's idling bad and bogging, check for smoke then as you try to rev it.

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post #10 of 22 (permalink) Old 07-06-2017, 11:01 AM Thread Starter
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As it is, it will barely run. To keep it going I need to constantly give it throttle. Will not idle on choke alone.
Seems like the smoke is just on startup.
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