1985 Honda Rebel 250 problem - Honda Rebel Forum

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Old 02-22-2011, 01:29 AM   #1
 
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1985 Honda Rebel 250 problem

I just bought an 1985 Honda Rebel 250. The seller has the engine started before I came to his place.
When I got it home, I try to start the engine again, it didn't start, then I found out that the gas was set to off and the kill switch was on, then I corrected those problems and I could get it started. (newbie problem)
At first, whenever I start using the throttle, it stalls (carb problem?). I let it run for a little bit, then put some of the fuel injection cleaner (which I bought for another bike) into the gas tank (about 1 oz), then let it run for a little and I can use the throttle just fine.
When touching the mufflers, I found out the left side is cool to the touch and the right side is hot. Checking the engine, left side is cool and right side is hot. Both side has sparks.
When I pull the plug on the left side, the engine still runs the same. When I pull the plug on the right side, the engine dies.
I don't know where to start, please help, thanks.
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Old 02-22-2011, 01:37 AM   #2
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I would check to make sure the spark plug gap is set at .02-.03 inches.

Also, the bike is cold blooded and needs a few minutes of idle time to warm up before adding any throttle. My would die if I gave it some throttle before it warmed up.
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Old 02-22-2011, 01:41 AM   #3
 
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I would first try swapping the coils and plugs, if still no fire on the left side I would check compression. If the bike sat with the intake open you may have something blocking the intake on the left side and no fuel getting to the left cylinder. Maybe a stuck valve or broken cam, hopefully not a busted rod. Should be easy to troubleshoot with the engine in the frame, the valve cover is easy enough to pull. Hope this helps, Chef
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Old 02-22-2011, 01:45 AM   #4
 
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I tried swap spark plugs, coils and have the same result. I took it out today and it ran just fine at 35 MPH, didn't try to run faster.
The problem now is the left side running cold when the right side is hot
Remove the left spark plug and I still feel the puffing
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Old 02-22-2011, 01:46 AM   #5
 
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Welcome, letus. There are a number of reasons one cylinder isn't firing. I'm sure one of our more experienced wrenches will be along shortly to walk you through it.
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Old 02-22-2011, 02:53 AM   #6
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Cold starts on a Rebel do usually require some choke. That explains the throttle response when cold. Its typical.

No power from one side is a different issue.
Could be a valve lash issue, could be compression. Could be a stuck or blocked valve.
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Old 02-22-2011, 07:50 AM   #7
 
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I'd check and adjust the valves first then do a compression check.
Considering both cylinders get fed by the same carb that can't be the issue.
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Old 02-22-2011, 11:14 AM   #8
 
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Open up the valve cover and find out the rocker on the left side is mising. I wonder what make them remove the rocker?
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Old 02-22-2011, 11:50 AM   #9
 
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Bought this item from ebay
HONDA 1986 CMX250 250 REBEL ROCKERS AND CAMSHAFT - eBay (item 110600797949 end time Feb-22-11 08:27:37 PST)
I wonder if this is the right match for it?
Also what is the valve gap for intake and exhaust?
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Old 02-22-2011, 12:50 PM   #10
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.002 to .004 inches for both. Most folks take the middle at .003
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