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dies with throttle

  • Thread starter Thread starter ArtByScars
  • Start date Start date
A

ArtByScars

Guest
just recently a few times while I was riding, my bike would hiccup on the highway...then a few times tipping it through a turn it would bog down.
I didnt wanna get stranded, so I havent been riding the bike much. The other day i went to take it out- it would run with the choke on, but then would bog down if I took the choke off and gave it throttle. just ~BLEEEGGHHH~ when I hit the throttle. the rpms dropped.
I messed with the air screw (the one you turn with your fingers) and that helped for a little bit, then it was turned clockwise all the way and I figured i had a problem.
but now it wont even start, just turns over endlessly.

Carbs were rebuilt in August 2010, and since then I've run seafoam/carb cleaner at least 3 times between oil changes.

:-s

thanks for the input- I'm in brooklyn/manhattan if that helps!
 
The leaning over and bogg sounds like a carb cleaning to me even with your precautions.
If others advise carb cleaning might be a good idea to pull off petcock drain gas through big funnel with paper towels to determine if gas is contaminated with rust or other debris.
 
i'm hoping it's not the carbs need cleaning,
i'm going to see if I can get away with a seafoam carb spray "cleaning" first. Or if that will at least get me to a garage to store it for the winter!

if anyone is around NYC that could help me trouble shoot I'd be psyched
 
One thing about cleaning carbs is that if you have a contaminated gas tank, it will continue to cause problems. Of course you can use a clear fuel filter, too, and see if that gets contaminated quickly.
If you aren't sure that the tank was clean before the carbs were, I would check that, as already mentioned by Crankthat.
 
Most likely clogged pilot jets, ESP. If you don't ride very often. These are very tiny jets in the Carb and will require a proper cleaning if the culprit. The big thing you turn by hand is the idle speed adjuster, and if set too high you won't be able to start. Try turning it out until it comes off the stop, then in 2 turns. You should be able to start it here anyway.
 
boggin while leaning sounds like the floats are adjusted wrong, but thats a newbies thought compare to the experts on here
 
Are the plugs fouled? Could be running rich and an indicator of your problem.
 
Hi,

Could be that either the pilot jets are plugged or the air intake system has developed leaks. Have you done all the maintenance for the intake system and carbs? Is the air box sealed? Are all the intake boots and intake boot O-rings in good shape (boots between the airbox/carbs and carbs/head)? Have you replaced the intake boot O-rings? If the bike has been sitting for a while then it is possible that the pilot jets are plugged. You can never go wrong with a proper cleaning and new set of carb O-rings.

My bike was running poorly recently and I couldn't figure out why until I did a close visual inspection of the intake system. It turns out that my airbox had somehow crept back away from the carbs and pulled a couple of the "airbox to carb" boots away from the carb intakes. This was causing a big air leak. I loosened everything up, slid everything back into place, tightened and re-clamped the boots to the carb intakes, and all was good to go.


Thank you for your indulgence,

BassCliff
 
What air screw did you turn, anyway? I usually turn the thumbscrew on the cam chain tensioner when mine does that.
 
Hi,

Were you turning the main idle adjustment screw?

intake_repair36-1.jpg



Thank you for your indulgence,

BassCliff
 
yeah i was turning the main idle screw.

picture.php


My bike started and ran with the petcock in this position.. it actually ran perfectly fine.
when I turned it back to the normal vertical position it cut out and would not start.
 
So you are running the motorcycle with the petcock in the "PRIME" position. This is always open.

Pointing down to "ON" is the vacuum actuated position, so the issue to sort out is why the petcock is not opening to allow gas flow in the "ON" position?

Contributing factors could be a blocked tank vent...plenty of threads here detailing that particular issue.

Also, on my 650G, the fuel pickup in the tank is really high, and I have to switch over to reserve very early, somewhere on the order of just under 1/2 tank. It'll act just the same as you are describing if I don't catch it early enough
 
BigD_83 said:
So you are running the motorcycle with the petcock in the "PRIME" position. This is always open.

Pointing down to "ON" is the vacuum actuated position, so the issue to sort out is why the petcock is not opening to allow gas flow in the "ON" position?

Contributing factors could be a blocked tank vent...plenty of threads here detailing that particular issue.

Also, on my 650G, the fuel pickup in the tank is really high, and I have to switch over to reserve very early, somewhere on the order of just under 1/2 tank. It'll act just the same as you are describing if I don't catch it early enough
Click to expand...

yeah mine will start to cut out early as well, it doesn't even get near the red on the gauge and i need to switch it to reserve.
but beside that fact, since it runs on prime-that means the gas is not an issue and the fact that it run just fine in prime wouldn't necessarily mean the jets are plugged, right?
if anyone is around NYC, I'm off til friday
 
I don't think you have just one problem

The interesting points so far are:


1: Carbs have been cleaned by running carb cleaner/other solvents. - I believe you have CV or vacume type carbs

2: It runs/ran better with the choke on, and dies when the choke is off

3: It ran better with the idle screw turned clockwise -> which i believe means with the butterfly valves are more open

4: The engine hiccups on the highway, and bogs down in a turn - Left and right turns? or only one side?

5: The engine starts with the petcock in the prime position, but not in the on position. - Had you reset the idle screw back to the original position, or was it still turned clockwise?

Its sounds like you have at least two, possibly three problems

The first is that I suspect the vacuum diaphrams in the top of each carb, which lift the vertical slides and let in more fuel, have either become soft, or one or more has a small leak. This is likely the result of a little too much carb cleaner being sprayed through the air intake, which softens the material. The good news is that soft diaphrams have been known ot fix them selves over time, or can be rinsed gently in gasoline. This would explain the hiccuping on the highway, the occational bogging down when turning. It would also explain why your engine dies when you turn the throttle. If you can rev the engine by slowly opening the throttle, it would be another indicator that this is the case. Note that if you cannot rev the engine this way, it does not mean your diaphrams are fine. It would have little to no effect on idling, unless your pilot jets are not working properly, in which case it will play games with you.

The second problem, which may be independent or the result of the soft diaphrams, is that you seem to have lost some of your vacuum pressure. A leak in a seal, or a blockage of a port would explain why you can run on prime but not on the on position. This is assuming your petcock is working properly, and may contritube to why having the choke on helped. Does the choke make a difference when the petcock is in the prime position? Does the engine still die when the choke is turned off? Check your vacuum hose, especially the ends, for any possible leaks.

Possible third problem is blocked pilot jets are reducing the fuel flow at idle. It would explain point #2, and #3. However it would also mean your bike would run a little bit lean most of the time, which is contrary to the hiccupping and bogging.

You may also just be running really rich. What do the tips of your spark plugs look like? Is there is a difference in power, throttle response/bogging when the engine is cold and when it is warmed up?

Running on prime, by the way, would mean that your main jets at least are fine. (by running you mean it starts and idles, or can you actually ride as per usual, getting normal power and throttle response?) a botched petcock would explain a lot as well. You can test it by disconnecting the fuel line to the engine, and then using your mouth or a siringe to apply a light vacuum pressure through the vacuum line. If the gasoline comes pouring out, your petcock it just fine.

It's an interesting problem you have. Give as much detail as you can, may be you do not need to rebuild your carbs. PM me or post here if you'd like more info from me.
 
Ok we had warm weather, no hurricane, and a day off. I think i found the vacuum leak. :rolleyes: :p

302775_10151263440534427_1366015474_n.jpg
 
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