1985 Honda Knighthawk carburetor problem?

Question

I have a 1985 Honda Knighthawk CB450SC and the carbs were removed and cleaned thouroughly jets everything and when I ride it it still loads up. Plus when you you put your hand on the carb while it's running it feels cold almost like it's vapor locked. Any suggestions?

Answer 1

carbie site...& how to tune.

http://www.dansmc.com/MC_repaircourse.htm

Carburetor Theory and Tuning Changing those jets.
Carburetors Servicing your Caburetor.
Balancing Carburetors Matching the Throttles.
Exploded Carburetor Veiws Lot and Lots of Carburetors !
Pumper Carbs Blow that fuel in !
Two Stroke Power Valves Power from the Valves.
Reed Valves One way Flappers.
Air Cleaners Clearing the air.

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Carb icing.
One of the problems with the spinning, compressing, vacuum-generating properties of the venturi is that it cools the air in the process. Whilst this is good for the engine (colder air is denser and burns better in a fuel-air mix), in humid environments, especially cool, humid environments, it can result in carburettor icing. When this happens, water vapour in the air freezes as it cools and sticks to the inside of the venturi. This can result in the opening becoming restricted or cut off completely. When carbs ice up, engines stop. In aircraft engines, there is a control in the cockpit called "carb heat" which either uses electrical heating elements to heat up the venturi to prevent icing, or reroutes hot air from around the exhausts back into the carburettor intakes. In cars, we don't have "carb heat" but instead there's normally a heat shield over the exhaust manifold connected via a pipe to a temperature-controlled valve at the air filter. When its cold, the valve is open and the air filter draws warm air from over the exhaust manifold and feeds it into the carburettor. As the temperature warms up, the valve closes and the carburettor gets cooler air because the risk of icing has reduced. The symptoms of carb icing are pretty easy to diagnose. First, your engine bogs down at high throttle then it loses power and ultimately could stall completely. You'll stop on the side of the road and wait a couple of minutes, then the engine will start and run normally. This is because with the engine off, the heat from the engine starts to warm up the carbs and melts the ice so that when you try to start it up again, everything is fine.

Answer 2

By "loading up" if you mean running rich, then I'd make sure then float height is set correctly in each carb. Also the float needle valves are probably leaking fuel into the cylinders, and should be replaced too.

Answer 3

You should check the flow from your petcock your more likely starving rather than loading up

Answer 4

When was the last time the valves were adjusted?

Answer 5

get a YAMAHA ;)