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Vapor Lock
- dcv83
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Thanks much,
Dan
PS, I just cleaned the carbs by hand (took em apart and put the back together), the problem existed before this and was not fixed by it. (I did not disconnect the individual carbs from each other)
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- Link14
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You'll laugh, but I've had alot of success in putting the petcock in prime position and rocking the bike back and forth. I've got a clear fuel line so I can see when the fuels filling the line again. Don't forget to put the petcock back in the run position when you're done.
As far as it dying while running....boy, I'd check to make sure that the vent hole on the fuel cap isn't plugged. It's a pretty small hole and hard to miss, but if it's plugged you'll have trouble with fuel flow.
Good Luck!
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- hoghaterkaw
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- bountyhunter
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Actually, vapor lock is possible if you have a fuel pump. In sacramento back in the 70's (where it gets Hell hot in the summer), I had a Plymouth Duster that would vapor lock sometimes because the fuel up near the pump was more gas than liquid. The fix was to mount an electric fuel pump back at the tank to push cold (liquid) fuel and bypass the front pump.PLEASE don't make me laugh. vapor lock ended back in the 1930's. modern gasoline is blended so that vapor lock is gone. you have a fuel delivery problem.
1979 KZ-750 Twin
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- dcv83
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- wrangler615
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83 Kaw KZ750F1 - massive money pit
82 Zuki GS1100G - my daily driver, possible sacrilege I know
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- dcv83
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- wrangler615
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1. Check spark output on both sides of each coil, ensure strong blue flame on all four.
2. If NG check resistance across HOT coils spark wire outputs. Fix as necessary.
3. If good check for signal and power to coils when symptom occurs. Should have batt (+) on the pink or red wire. Check other wire by connecting test light to positive lead on battery and touch probe end to terminal. While cranking the light should flash.
4. If NG suspect faulty igniter unit or bad PM pickup.
You can check the windings of the pickups by measuring across the two wires on each one under the cover. Compare the two, they should be probably within an ohm or two of each other.'
PS: What bike y/m/m exactly? So I can get my info straight.
83 Kaw KZ750F1 - massive money pit
82 Zuki GS1100G - my daily driver, possible sacrilege I know
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- dcv83
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What does NG mean. And how should I do these tests?
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- wrangler615
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83 Kaw KZ750F1 - massive money pit
82 Zuki GS1100G - my daily driver, possible sacrilege I know
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- dcv83
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- PLUMMEN
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Still recovering,some days are better than others.
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