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verngroves
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« on: June 05, 2021, 04:44:02 PM » |
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What could cause the bike to run well with the gas cap open? Prior to my opening the gas cap my 2000 Valk STandard would die a death every mile or two traveling down the road? It was doing fine for about 70 miles and then this started: running fine, running on 3 - 4 - or 5 cylinders, then finally stop. Stopped beside the road to let it rest and hopefully regain whatever it had lost. And it would start again. Go another 1 or 2 miles and then go through the same process. Finally got to the point it would not run at all. I let it set for about 20 to 30 minutes. Then got the idea of opening the gas cap. It started right up and I drove home which was about 15 miles and it ran fine.
Any thoughts from you Valk experts. By the way, I just turned 100,000 miles and was feeling pretty good.
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da prez
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« Reply #1 on: June 05, 2021, 04:50:02 PM » |
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Plugged fuel tank vent.
da prez
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Bret SD
Member
Posts: 4306
***
San Diego, Ca.
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« Reply #2 on: June 05, 2021, 04:50:18 PM » |
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What could cause the bike to run well with the gas cap open? Prior to my opening the gas cap my 2000 Valk STandard would die a death every mile or two traveling down the road? It was doing fine for about 70 miles and then this started: running fine, running on 3 - 4 - or 5 cylinders, then finally stop. Stopped beside the road to let it rest and hopefully regain whatever it had lost. And it would start again. Go another 1 or 2 miles and then go through the same process. Finally got to the point it would not run at all. I let it set for about 20 to 30 minutes. Then got the idea of opening the gas cap. It started right up and I drove home which was about 15 miles and it ran fine.
Any thoughts from you Valk experts. By the way, I just turned 100,000 miles and was feeling pretty good.
No expert here but the tank vent line is likely pinched or clogged. |
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Bret
02 Standard -- Blue & White
82 Aspencade -- Red
“No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable.” Socrates
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gordonv
Member
Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #3 on: June 06, 2021, 08:08:52 AM » |
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If you had the tank off recently, then it was most likely placed back on without regard of the air vent line going to it on the underside, and it was kinked, pinching off the air going into the tank to replace the gas. So you have a vacuum inside the tank, stopping the fuel flow at a point, and the carbs running dry. Or the vent line is plugged with something (didn't someone have a mug bug plug theirs?).
You found the trick, open the cap. Do that when the bike dies, and you should hear the rush of air coming in. Place something under the cap before you close it, and it will break the seal around the cap, letting air in (zip tie, stir stick, spare key, etc).
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1999 Black with custom paint IS   |
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WintrSol
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« Reply #4 on: June 06, 2021, 10:00:47 AM » |
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Of course, these guys are talking about the model made for California, that had a charcoal canister and vent inside the tank. The rest have a vented cap, which could just be blocked.
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98 Honda Valkyrie GL1500CT Tourer
Photo of my FIL Jack, in honor of his WWII service
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Valker
Member
Posts: 2995
Wahoo!!!!
Texas Panhandle
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« Reply #5 on: June 06, 2021, 11:18:00 AM » |
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Of course, these guys are talking about the model made for California, that had a charcoal canister and vent inside the tank. The rest have a vented cap, which could just be blocked.
Nope. My 98 NON-CA model has a vent line which is easily plugged or kinked. Cap is NOT vented. |
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I ride a motorcycle because nothing transports me as quickly from where I am to who I am.
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John Schmidt
Member
Posts: 15200
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #6 on: June 06, 2021, 11:30:49 AM » |
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Of course, these guys are talking about the model made for California, that had a charcoal canister and vent inside the tank. The rest have a vented cap, which could just be blocked.
Nope. My 98 NON-CA model has a vent line which is easily plugged or kinked. Cap is NOT vented.  Other possibility would be if you recently replaced the fuel line going to the petcock, and when doing so you lengthened it slightly to facilitate reinstallation. When the engine gets warm it often causes the long line to sag, created a low spot and a vapor lock. However, my money is on the vent tube. |
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gordonv
Member
Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #7 on: June 06, 2021, 11:57:51 AM » |
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John makes a good comment. The above are all based upon an OEM fuel line. Can you tell the difference? Do you have the Service Manual? I think this is the link, I'm not home. For a PDF copy. www.norwayvalkryie.com/download |
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1999 Black with custom paint IS |
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Bighead
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« Reply #8 on: June 06, 2021, 07:02:21 PM » |
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Of course, these guys are talking about the model made for California, that had a charcoal canister and vent inside the tank. The rest have a vented cap, which could just be blocked.
Where did you come up with that? My ‘97 dont have a vented cap. And it has never even been in Ca  |
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1997 Bumble Bee
1999 Interstate (sold)
2016 Wing
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WintrSol
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« Reply #9 on: June 06, 2021, 08:31:09 PM » |
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Of course, these guys are talking about the model made for California, that had a charcoal canister and vent inside the tank. The rest have a vented cap, which could just be blocked.
Where did you come up with that? My ‘97 dont have a vented cap. And it has never even been in Ca It seems to be only mentioned on the figures in the service manual in connection with the CA model with the canister. Maybe a closer look ... |
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98 Honda Valkyrie GL1500CT Tourer
Photo of my FIL Jack, in honor of his WWII service
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verngroves
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« Reply #10 on: June 08, 2021, 03:47:30 AM » |
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Thanks y'all for your expertise. It was the vent. I think there must have been something in the line as I blew through it and it opened up. I went for about a 20 mile ride yesterday and all seems to be good. You guys are the best and continue to keep these bikes on the road with your years of experience.
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