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vrider
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« on: January 28, 2018, 06:47:11 AM » |
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Here is my problem on a 97 Valk with 85k.
Bike starts easy and no lack of performance but backfires between shifts and the engine gets uncomfortably hot after a while riding. No idiot light.
I have been told that it is probably a vacuum leak
Also advised to get the carburetors rebuilt
Is there any place I can send the carbs to get fixed?
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George B
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« Reply #1 on: January 28, 2018, 06:58:33 AM » |
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Sounds like a classic vacuum leak. Probably time to get a roll of tubing and pull the tank. I wouldn't touch the carbs until you inspect all the tubing. Probably a good time to rebuild the gas shut off, if you haven't done so.
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1997 1500CT with California Sidecar
Now a Roadsmith Trike conversion
Former rides:
1988 BMW R100GS
2007 Ural Patrol
15 HDs from 1937 to 1977
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gordonv
Member
Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #2 on: January 28, 2018, 09:24:49 AM » |
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I always suggest carb clean is the 1st step when ever there is any running issues. Either in the way the engine is running in any of the RPM ranges, or if it has been sitting for a long time, more than one whole season.
1/2 can of Berrymans B12 with a fresh 1/2 tank of fuel. Drive it through all the RPM ranges, low to high. If you have no specific problem (which you don't), get it into that RPM range and drive it there.
If you think your engine is also getting hot, no light, but also no fan, I would test that the fan operates by bypassing the sensor and ground it to activate the fan.
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1999 Black with custom paint IS   |
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Roidfingers
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« Reply #3 on: January 28, 2018, 10:53:24 AM » |
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Your location would help. May have someone near by to assist.
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Savago
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« Reply #4 on: January 28, 2018, 11:20:37 AM » |
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An oil temperature dip stick + a coolant temperature gauge would provide definitive answer to the question of running too hot (or not).
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Hooter
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« Reply #5 on: January 29, 2018, 08:29:47 AM » |
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Vacuum leak I to would suspect? Check your exhaust nuts first, make sure they are good and snug. If you find them loose, and then snugged up, ride it and see if the problem goes away. (Tights tight and brokes broke with the nuts) Also the carb plugs (used for carb sync) can get brittle and break. You can check them as well without pulling the tank. If these 2 things are ok and the problem still exist, then pull the tank and take a look at the vacuum lines. If you have to pull the tank, make sure it's as empty as possible.
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« Last Edit: January 29, 2018, 08:37:46 AM by Hooter »
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You are never lost if you don't care where you are!
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da prez
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« Reply #6 on: January 29, 2018, 03:54:10 PM » |
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I would recommend doing what needs to be done before riding season. Check for vacuum leaks. Check vacuum hoses for cracks(part of leaks) or being soft. The intake runners properly tightened , and runner clamps properly tightened. If you have fuel stains by the runners , you may have fuel leaking from the carbs. I (almost always) recommend a de-smog. Get rid of the unused vacuum and pair valves. Hook a new fuel vacuum line to the right rear vacuum port. Rebuild the fuel shutoff. Check the vacuum port covers as they will crack and leak also. Check the tech board and ask more questions. Post your location as there is help near by.
da prez
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vrider
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« Reply #7 on: January 29, 2018, 06:00:47 PM » |
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Sounds like the right thing to do
I live in Western Massachusetts
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