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Mike
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« on: October 08, 2011, 02:35:02 PM » |
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I need some ideas on why my bike is hesitating. It's a 2000 standard with 137,000kms.
I am going along fine and when I crack the throttle to pass I am getting some hesitation. If I run up the throttle slowly everything seems ok.
The bike is pretty much stock, other than the shiny stuff.
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Michvalk
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« Reply #1 on: October 08, 2011, 03:01:26 PM » |
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Have you tried running some Seafoam or Tecron cleaner through yet? Try that first. Run a full bottle to a tank full of gas. Run a part of a tank in the evening, then run the rest out the next day. Couple of bottles should fix it. Wouldn't hurt to inspect the vacume lines to the petcock and to the intake. Check the clamps on the carbs holding the stuff togeather. Could be a vac leak so going through it all is a good idea. The airbox and intake clamps will work loose. Shouldn't be anything worse than that, other than sparkplugs.  |
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Mike
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« Reply #2 on: October 08, 2011, 03:22:31 PM » |
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Have you tried running some Seafoam or Tecron cleaner through yet? Try that first. Run a full bottle to a tank full of gas. Run a part of a tank in the evening, then run the rest out the next day. Couple of bottles should fix it. Wouldn't hurt to inspect the vacume lines to the petcock and to the intake. Check the clamps on the carbs holding the stuff togeather. Could be a vac leak so going through it all is a good idea. The airbox and intake clamps will work loose. Shouldn't be anything worse than that, other than sparkplugs. I did put some seafoam in before my ride today. I have not replaced any vaccum lines yet but I will check the items you listed. |
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Chrisj CMA
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« Reply #3 on: October 08, 2011, 03:25:25 PM » |
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Good advice on the techron or seafoam and checking for vacuum leaks, your next stop will be to investigate the possibilty of petcock failure. If its loosing some vacuum due to a diaphram it will have a problem with any max fuel delivery situation. The OEM valve is JUST able to provide max gas when all is good. let it have even a small problem, and it will starve the motor for gas at high flow situations.
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Mike
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« Reply #4 on: October 08, 2011, 04:44:03 PM » |
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Good advice on the techron or seafoam and checking for vacuum leaks, your next stop will be to investigate the possibilty of petcock failure. If its loosing some vacuum due to a diaphram it will have a problem with any max fuel delivery situation. The OEM valve is JUST able to provide max gas when all is good. let it have even a small problem, and it will starve the motor for gas at high flow situations.
Is there any way of testing the petcock to rule it out? I did do a rebuild of the petcock about two years ago. There wasn't a problem with it, just precationary. |
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Chrisj CMA
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« Reply #5 on: October 08, 2011, 05:19:31 PM » |
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Theres the vacuum leakdown test. remove the line from #6 and attach a vacuum pump to the valve. When a small amount of vacuum is built up and then the pump stopped it should hold, not leak down
Me, I just replaced it witha Pingel so theres never a doubt. That OEM thing is junk
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sandy
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« Reply #6 on: October 08, 2011, 06:40:59 PM » |
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Mike: 137,000 cliks and no vacuum line replacements. I'd say that's your problem. As was said, check/tighten all the intake clamps and vacuum lines. The intake O rings will show a stain around the intake runners where they meet the cylinder head. If you have the stain, replace them too. Get #123 in Viton or silicone.
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Chiefy
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« Reply #7 on: October 08, 2011, 07:27:10 PM » |
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Good advice on the techron or seafoam and checking for vacuum leaks, your next stop will be to investigate the possibilty of petcock failure. If its loosing some vacuum due to a diaphram it will have a problem with any max fuel delivery situation. The OEM valve is JUST able to provide max gas when all is good. let it have even a small problem, and it will starve the motor for gas at high flow situations.
Not being a wise-guy here. But if he accelerates slowly and all is well, doesn't that mean his carb bowls are full? And if they are full, but the flow from the tank is weak, wouldn't he accelerate and soon afterwards see some starvation symptoms? Just trying to learn more. Carbs are strange and mysterious devices...... |
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 1998 Valk Standard 52,500 miles |
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Mike
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« Reply #8 on: October 09, 2011, 03:14:44 AM » |
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Mike: 137,000 cliks and no vacuum line replacements. I'd say that's your problem. As was said, check/tighten all the intake clamps and vacuum lines. The intake O rings will show a stain around the intake runners where they meet the cylinder head. If you have the stain, replace them too. Get #123 in Viton or silicone.
I just ordered some lines and o-rings for a winter project. These include, -Intake Runner O-ring kit - Viton GF -Pair Valve Vacuum Line - Viton B -Vacuum Cap Kit - Viton B -OEM Petcock Vacuum Line - Viton B Is there anything else or other lines I may need to replace? |
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9Ball
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« Reply #9 on: October 09, 2011, 03:20:23 AM » |
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what you are describing is a common symptom of plugged slow jets....the "chemical solution" may help, but it's probably at the point where you will need to replace the slow jets (if you tear into the carbs don't waste your time trying to clean them).
While you're in there, then replace the tubing and o-rings as you are already planning.
Good luck...
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« Last Edit: October 09, 2011, 04:44:30 AM by jrhorton »
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VRCC #6897, Joined May, 2000
1999 Standard
2007 Rocket 3
2005 VTX 1300S
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Chrisj CMA
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« Reply #10 on: October 09, 2011, 04:37:55 AM » |
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Good advice on the techron or seafoam and checking for vacuum leaks, your next stop will be to investigate the possibilty of petcock failure. If its loosing some vacuum due to a diaphram it will have a problem with any max fuel delivery situation. The OEM valve is JUST able to provide max gas when all is good. let it have even a small problem, and it will starve the motor for gas at high flow situations.
Not being a wise-guy here. But if he accelerates slowly and all is well, doesn't that mean his carb bowls are full? And if they are full, but the flow from the tank is weak, wouldn't he accelerate and soon afterwards see some starvation symptoms? Just trying to learn more. Carbs are strange and mysterious devices...... Being able to accelerate at all only means there is gas in the carburators. While the engine is running (technically) the carbs are never full because gas is being drawn out. Now if the fuel valve is working properly it will replace the gas almost if not AS fast as it is being withdrawn especially at slow speeds. The problem is when the valve is NOT working properly. When fuel flow is reduced because of a faulty valve, the petcock in effect becomes the primary jet (the petcock is limiting the amount of gas available) At that point you are cruising along and the fuel flow to the carbs is just enough to maintain what you are doing.....accelerae briskly and the slow fuel flow might not keep up. That (I believe) is what was happening to my bike for a month (I tried everything short of jet replacement) Switched to a pingel and all was well INSTANTLY |
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Ricky-D
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« Reply #11 on: October 09, 2011, 08:13:39 AM » |
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With CV carburetors there should be no hesitation.
I would need a better description of what this hesitation is before suggesting to start replacing parts.
Some gasoline additive is a good suggestion as well as changing the station from where he get his gasoline now.
The other good suggestions to check all the vacuum lines and the petcock workability are also pertinent.
But to start changing things is a bit premature.
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2000_Valkyrie_Interstate
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Blackduck
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« Reply #12 on: October 09, 2011, 04:16:17 PM » |
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This sounds much like an earlier post on lack of acceleration over half throttle.
Two parts to this problem if it is fuel related, not enough fuel or too much air.
Too much air can come from modified or damaged airbox.
If lacking in fuel it should show up as lack of power at high RPM not just a flat spot or hesitation.
Has any work been done to this bike before this problem started or have you had it the whole time you have owned the bike?
Cheers Steve
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2001 Standard, 78 Goldwing, VRCC 21411
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Mike
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« Reply #13 on: October 09, 2011, 04:26:09 PM » |
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This sounds much like an earlier post on lack of acceleration over half throttle.
Two parts to this problem if it is fuel related, not enough fuel or too much air.
Too much air can come from modified or damaged airbox.
If lacking in fuel it should show up as lack of power at high RPM not just a flat spot or hesitation.
Has any work been done to this bike before this problem started or have you had it the whole time you have owned the bike?
Cheers Steve
There hasn't been anything done to the airbox at all. This problem just started yesterday. |
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