Carburetor

[wrscomncents]

I would appreciate a little help here from those who have worked on there carburetors. My bike is a 1999 RSV. I had the carbs off the bike to rebuild them and thought everything was good when I put them back on. The bike fired right up. I was soon to find out that neither of the front two cylinders were firing. I checked for spark and was getting spark on both cylinders. When I pulled the plugs (which were new) the insulators on both plugs were pure white except for where the spark was occurring. Long story short I pulled the carbs back off. My question is how can I tell if I am getting gas from the bowls. I don't think that there is an accelerator pump on these carbs (could be wrong) so do I have to pressurize the carbs in order to tell if I am getting fuel from the bowls. Thanks.

[RDawson]

I would start by filling carbs through the fuel line and opening the drain plugs. If you get fuel there then you know the floats are operating. If you have to tear em back down make sure to blow out every tiny passage with carb cleaner and air.

[wrscomncents]

Thanks. I will definitely do that now that they are off. I know the bowls were filling before I put them back on because I did a float level test using the tube procedure and all of the bowls had fuel. Also new needle valves. You are right though. I cleaned the carbs but I may have to go in and make sure all passages are clear. I'm not sure the fuel is moving from the bowls to the carb throat. I'm thinking that I have to pressurize the carbs to see if the fuel is moving. I would like to test that before I put them back on. If anyone knows a good way to do that I would love any suggestions.

[Karaboo]

Carbs do not work on pressure. They work on vacuum. You can check that the inlet needles are seating, but you do not want to have any fuel flowing out of the bowls without the engine running.

 

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[bongobobny]

I once had two carbs stop working, and the problem was a very strange, but not the first time something like that happened! One of the two vent lines got plugged by an insect making a home in it! Each vent hose is used by two carbs. What happened is the bowls got emptied, and when the fuel pump tried to refill the bowls, the trapped air built up pressure, and stopped the fuel from entering the bowls!!!

 

So, as a quick test, try blowing through both of your vent lines and make sure they are not plugged. This may not be your problem but this has happened more than once...

[wrscomncents]

I once had two carbs stop working, and the problem was a very strange, but not the first time something like that happened! One of the two vent lines got plugged by an insect making a home in it! Each vent hose is used by two carbs. What happened is the bowls got emptied, and when the fuel pump tried to refill the bowls, the trapped air built up pressure, and stopped the fuel from entering the bowls!!!

 

So, as a quick test, try blowing through both of your vent lines and make sure they are not plugged. This may not be your problem but this has happened more than once...

 

 

 

I will definitely check that out. It would explain both carbs not working.