Question about Motorcycles
Posted by Anonymous on
Although I'm a Harley man, I'm going to try to help you on this one. Just like a Harley, your bike is equipped with "enrichers" on each carb. When you pull the cable, a plunger is raised that opens two ports. One port comes straight from the float bowl and the other port runs parallel to the carb throat and this port allows air to flow though it and over the fuel port.
Now, on a bike with an enricher system instead of a "choke" that uses a "throttle plate" to close off the main venturi of the carb, when trying to start the engine cold, you MUST leave the carb completely closed. Do not open the carb at all to start the bike when cold. If your enricher is set up properly, your bike should fire up and run at a slightly high rpm. Once started and warm up begins, you can rev the bike a bit if you don't do it too quickly.
The reason for this is that the fuel passage goes directly into the float bowl. With the carb main venturi completely closed, air is sucked through the enricher circuit bore creating a vacuum that sucks fuel from the float bowl resulting in an overly rich mixture with which to start the cold engine. If you open the carbs main venturi the slightest bit, you reduce the air going though the enricher bore thereby decreasing the vacuum on the fuel from the float bowl causing a too lean mixture for the cold engine to start. I always tell the guys that I work on this problem to let go of the throttle grip and push the start button with their index finger. This makes them leave the throttle completely closed.
Now, if this doesn't work you could have any of several problems with your enricher system. The first problem is to verify that both enricher valves are working on your bike. Your bike is equipped with dual carbs as best as I can remember so it'll have dual enricher circuits as well. Make sure the plunger is being pulled up in both carbs by the lever.
Next, the small hole in the bottom of the float bowl through which the fuel flows up the fuel port of the enricher may be stopped up with a piece of trash. The hole is very small and easily gets plugged. You'll have to remove both float bowls to check this out.
Ok, that's as much as I can tell you about your Honda. I work strictly on Harleys as I can't keep up with the Japanese. They change too much stuff on their bikes too often which makes Harley's easier to work on. I'm an old geezer that's been fooling with Harley's since 1966. I mostly work on older Panheads and Shovelheads that the dealers no longer work on. I also work on the Evolution powered Harleys but I don't touch the Twin Cam engines. They've went to computer controlled fuel systems and such and unless you've got a "breakout box", you can't do a thing with them. I avoid them like the plague.
Hope this helps, Good Luck and ride safe.
Posted on May 12, 2010
Could be a choke problem. also,improper valve adjustment can cause these symptoms.
Posted on May 12, 2010
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Posted on Jan 02, 2017
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