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Old 04-21-2019, 11:07 AM
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cth350 cth350 is offline
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Join Date: Dec 2000
Location: Long Island, NY
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regarding float height, if you are 2mm too low in the bowl, you will starve the carbs while you are at speed for a bit. If you are too high in the bowl, you may well flood it at some point. Neither would the be case a block from home. Unless maybe the fuel return valve isn't closing.

Did you bring it up to 4,500 rpm and check the timing there? Sounds pretty loud when you are under the hood and wind from the fan is fierce, but she should be steady and happy there while you confirm the timing.

Things to check before that...
- Plugs clean? After what you described, I would expect them to be fairly black. Are they copper or platinum? Use the copper kind and make sure they are not the R8 kind (you want R0, or "non-resistor" plugs).
- Fuel pump delivery. Have the fuel dump into a metal can instead of the carbs. There's a spec for how much fuel should be delivered after 60 seconds of turning at starter speed. The suggestion of checking the fuel strainer is good one, presuming your tank is close to empty or you want to siphon it all out into a bunch of other containers.
- vacuum leaks. There are plenty of places for it to leak, find them and plug them.
- Carb linkages... You've got the carbs well balanced, with the RPM drop consistent between each carb? There's that little bit of slack in the arm so that touching the gas pedal impacts the transmission before it moves the butterflies on the carbs? The little gizmo on the front carb impacts the throttle the way it's supposed to and when its supposed to?
- Look down the throats of the carbs at idle. You should not see any gas flowing through the tubes that sit in the primaries at idle.

-CTH
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