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Northern Valk
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« on: March 12, 2015, 02:19:33 PM » |
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I took the bike out for a pre-spring ride today, finally!  It's a 97 touring model with 30K. But I noticed that when I shifted, the engine rev's stayed high and didn't drop off until the shift was completed. Does anyone have an idea as to what would cause that? Thanks, John |
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Daniel Meyer
Member
Posts: 5493
Author. Adventurer. Electrician.
The State of confusion.
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« Reply #1 on: March 12, 2015, 02:43:08 PM » |
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Often a sign of a vacuum leak (if not something simpler...like gummed up throttle cables)
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CUAgain, Daniel Meyer  |
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old2soon
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« Reply #2 on: March 12, 2015, 02:45:00 PM » |
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Return spring got no spring left. Dry throttle cables. Are you holding the throttle open while shifting? There's a start anywho! RIDE SAFE.
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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Bighead
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« Reply #3 on: March 12, 2015, 05:04:53 PM » |
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Choke left on?
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1997 Bumble Bee
1999 Interstate (sold)
2016 Wing
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Northern Valk
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« Reply #4 on: March 12, 2015, 05:26:36 PM » |
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hmmm, well, the choke is not on, and after I noticed it was acting that way, I would turn the throttle all the way down when shifting with no response from the engine. If the throttle cable is dry or sticking, would it act that way?
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sandy
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« Reply #5 on: March 12, 2015, 10:33:57 PM » |
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hmmm, well, the choke is not on, and after I noticed it was acting that way, I would turn the throttle all the way down when shifting with no response from the engine. If the throttle cable is dry or sticking, would it act that way?
Might still have black ice in the cables. Maybe not: Lube the cables and I'd bet the issue disappears. |
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Pete
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« Reply #6 on: March 13, 2015, 07:00:55 AM » |
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If the throttle works smoothly both on open and close and the rider is making a effort to return the throttle to close on shifting, I would suspect vacuum leak or carb issue.
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Northern Valk
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« Reply #7 on: March 13, 2015, 06:10:47 PM » |
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Thanks for the responses guys. As it turns out, I took it out for a spin today to try and get a handle on this, and the rear tire blew out at 60 mph. So, the bike is in the shop getting new rubber front and rear, and also getting looked at for the shifting issue. I'll let you know what they find!
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Northern Valk
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« Reply #8 on: March 15, 2015, 01:35:36 PM » |
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Pete, or anyone who wants to chime in, where would the vacuum leak be? Fuel valve? or?
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old2soon
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« Reply #9 on: March 15, 2015, 01:54:21 PM » |
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Pete, or anyone who wants to chime in, where would the vacuum leak be? Fuel valve? or?
IF the lines have not been replaced or the bike desmogged the lines are 18 years old. I'm desmogging mine now because when I removed the fuel tank to R & R aircleaner the main fuel line split which meant the airbox had to come out and being as I was THAT far into it do the sesmog. Look between you carbs under the air box and you'll have an idea of the amount of POTENTIAL vacuum leaks. Use a bright light. There are 2 threads on the shop talk page with desmogging. They both have good pictures of what I'm talking about!  Hope this is of some help. RIDE SAFE. |
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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Pete
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« Reply #10 on: March 27, 2015, 02:06:18 PM » |
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Pete, or anyone who wants to chime in, where would the vacuum leak be? Fuel valve? or?
Usually a vacuum hose or an intake o ring. Any connection between the carb and the intake valve. |
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Northern Valk
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« Reply #11 on: March 31, 2015, 07:26:39 PM » |
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Yep, exactly right! It was a vacuum hose leak. Thanks for the help guys, it's great to have such a knowledgeable bunch to turn to. |
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