Valves of Carb.? - Honda Rebel Forum
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post #1 of 6 Old 06-26-2019, 10:36 AM Thread Starter
Join Date: Aug 2018
Location: north al.
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Valves of Carb.?

Need some help folks.I have an 04 rebel with 19k miles (7k I put on in 3 yrs. with no issues).The bike will not idle until it gets very hot and seems to be idling off one cylinder and popping thru the exhaust.I can remove the left plug wire and it will idle on the right cylinder,remove the right and it dies.The bike runs fine on flat road but looses power pulling hills.I first thought plugs but have put in three different sets.The problem did not start all at once but is getting worse the more I ride.the bike is a daily rider.Help please!

2004 honda rebel 250
Marvin Pendergrass Jr. is offline  
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post #2 of 6 Old 06-26-2019, 11:38 AM
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Have you checked to be sure the left plug is firing? It's best done when dark so the spark, if any, can be easily seen. If there is spark, check compression. There's a thread on this stickied in the Wrenching How To section.

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post #3 of 6 Old 06-26-2019, 12:29 PM Thread Starter
Join Date: Aug 2018
Location: north al.
Posts: 17
The left side has a really good blue spak.The valves hasn't been adjusted sense I have had the bike.Would the valves being out cause this problem?

2004 honda rebel 250
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post #4 of 6 Old 06-26-2019, 02:24 PM
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Location: Maine
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It could. If you have a stuck valve you would not get combustion in that cylinder. A compression check will tell you how bad it is. You might even be able to detect a stuck valve with compressed air blown into the intake and exhaust ports.

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post #5 of 6 Old 06-27-2019, 02:08 PM Thread Starter
Join Date: Aug 2018
Location: north al.
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I removed the fuel line from the tank and had a good flow coming from the tank.While I had the line off I blew compressed air back thru the carb. Started it up and the thing set there and idled.Does not run perfect but a lot better. Carb kit on the way.It's nice to have folks with knowledge that is willing to help.Thanks a lot!

2004 honda rebel 250
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post #6 of 6 Old 07-02-2019, 12:13 PM
Join Date: Sep 2018
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Adjusting the valves on the Rebel is super easy. I would do that in either case. But also check or replace the spark plug, and if that's not working start going up the electrical system to the coil, etc. I would expect that if it is only firing on one cylinder it means it's not a carb problem, since the carb feeds both cylinders equally. However, again the carb on the Rebel is simple, so it doesn't hurt to take it out and clean it. Be sure to check the float height (YouTube it and read the service manual), and make sure the idle mix screw is set correctly. I have been bitten by that thing multiple times on multiple bikes.
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