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post #1 of 32 (permalink) Old 03-23-2011, 06:20 PM Thread Starter
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Weird Problem

My '92 VN750 has a strange problem with cutting out when I am cruising and holding the RPM's around 4-5000. It feels like it is starved for fuel. It wont die or drop RPM's much, just kind of sputters for a bit. Giving the bike a little choke helps it when it sputters, but doesn't fix it. Giving it a little throttle will usually help also.

I also noticed today that strong gusts of wind make the bike cut out really bad. If I hit a big gust of wind, the bike almost stalls out. I tried opening the throttle when it was stalling in the wind and it did nothing. It just about died when I gave it throttle.

So, I am pretty sure I have a carb/intake problem.

I read somewhere about modifying vent hoses, but I can't seem to find it now. I've had this problem ever since I've owned the bike. It's just now starting to get on my nerves bad enough to fix it.

My guess is that it is lean, but I dont know if it is the carbs or something else. Anyone else ever had this problem.

What do you guys think? Carb? Air intake? Something else? If you need more info, just ask.

P.S. Carbs are clean and I always run seafoam in my gas. I don't see any issues with the carb/air boots either.
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post #2 of 32 (permalink) Old 03-23-2011, 06:35 PM
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Quote:
Originally Posted by nearma12 View Post
My '92 VN750 has a strange problem with cutting out when I am cruising and holding the RPM's around 4-5000. It feels like it is starved for fuel. It wont die or drop RPM's much, just kind of sputters for a bit. Giving the bike a little choke helps it when it sputters, but doesn't fix it. Giving it a little throttle will usually help also.

I also noticed today that strong gusts of wind make the bike cut out really bad. If I hit a big gust of wind, the bike almost stalls out. I tried opening the throttle when it was stalling in the wind and it did nothing. It just about died when I gave it throttle.

So, I am pretty sure I have a carb/intake problem.

I read somewhere about modifying vent hoses, but I can't seem to find it now. I've had this problem ever since I've owned the bike. It's just now starting to get on my nerves bad enough to fix it.

My guess is that it is lean, but I dont know if it is the carbs or something else. Anyone else ever had this problem.

What do you guys think? Carb? Air intake? Something else? If you need more info, just ask.

P.S. Carbs are clean and I always run seafoam in my gas. I don't see any issues with the carb/air boots either.
there is a vent hose that runs from a tee at the carb vents that should run into a small opening that is just a holder for the hose,on the back side of the right air filter housing sounds like yours has fallen out or is gone.Check for about a half inch hose on the back of the filter housing if it is not plugged into that hole cut the end of the hose at about a 45 degree angle and push it back in there,if it is in there take it out and angle the end of it and trace it back to the tee at the carb and make sure it is attached and not kinked or has a hole worn in it.




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post #3 of 32 (permalink) Old 03-23-2011, 06:50 PM
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What Denny said, but it may be jammed in and stopped off, it is a vent so it should be ok if not plugged, so the 45* cut should work...
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post #4 of 32 (permalink) Old 03-23-2011, 07:59 PM
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What denny and OD said, If that don't work be sure to check that wasps have not nested in the hose.

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post #5 of 32 (permalink) Old 03-23-2011, 09:31 PM
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post #6 of 32 (permalink) Old 03-23-2011, 09:49 PM
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Couple of other thoughts, 1- if it happens to be a California bike it could be the pollution junk... 2- If it just does it after you run a bit it could be tank not venting and starving the carbs... You don't have to be in Cal. for it to be a Cal. bike, bought my 06 new in Tn. and it was a Cal. bike and gave me probs with the pollution junk...
Have a good one...Old Dog...

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post #7 of 32 (permalink) Old 03-23-2011, 09:57 PM
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Out of curiosity how do you know for if its a ca model? I am assuming that means California not Canada?

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post #8 of 32 (permalink) Old 03-23-2011, 09:58 PM
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What everybody else said. Since it is affected by strong winds, it is almost certainly that carb vent tube that is supposed to be stuck into the back of the right ear. I had this exact problem with my '86 after doing the ear shave and just leavin that hose hanging in the wind. Once I stuck it up under the tank so it was unaffected by wind, the problem disapppeared completely.

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post #9 of 32 (permalink) Old 03-23-2011, 10:57 PM
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Quote:
Originally Posted by niterider View Post
What denny and OD said, If that don't work be sure to check that wasps have not nested in the hose.
that is exactly right ,I did a complete carb tear down on my300 4TRAX(since been stolen from me) before finding a mud daubers nest in the air intake almost completely blocking it off.But the happening at speed makes me think it is flopping in the breeze.I also forgot to tell him if it had been ear shaved to tie it up underneath the tank out of the wind,I put a lawn mower fuel filter in the end of mine and left one end open and zip tied it up underneath the tank. The filter lets it breathe and keeps the bugs out of the hose as well.




If you see it on my bike I did it
VROC#30324
92 vn750(sold)
Current ride 05 1500 Classic FI
lovin' the new scoot



Quote:
"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

Psalm 40:1...
XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
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post #10 of 32 (permalink) Old 03-24-2011, 06:57 AM
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Quote:
Originally Posted by techdif View Post
Out of curiosity how do you know for if its a ca model? I am assuming that means California not Canada?
Yes Cal. meaning California model... It will have 2-vent tubes coming from the rear of the tank, the one on the right side will go to the Cal. pollution control junk, the one on the left will be the normal tank vent and goes to the bottom of the bike and is open... There is also a page in the service manual (don't have my manual anymore) that shows the extra Cal. junk... HTH...
Have a good one...Old Dog...

Southern Central Tennessee.......
Now on the Dark Side......
Girl's Bike 09 Sporty xl 1200 Custom...33k + & clickin......
Sportster Owner/Rider since age 72...lol... Rider since Simplex...???
09-xl1200 "C" Vivid Black, Cast wheels w/19" Frt., SE-Stage 1+, X14iEDs...
MicroTach +, Higher wider H-bars, GPS Mt., Mustach bar Hwy. pegs...
Viking Shock cutout Saddlebags, Rear Mt. Signal Lt. Kit, Fork Brace...
RoadKing Air Shocks, Mustang Seat, Progressive Fork Springs...
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