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post #1 of (permalink) Old 09-17-2003, 04:30 PM Thread Starter
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O/T - Motorcycle runs rough - basic engine ?

I know its not a Jeep but it has as many cylinders as some. Its a '74 Honda CB550 with an inline 4 SOHC. Today I was riding it when all of a sudden it felt like the power nearly doubled. It had always ridden kinda flat and all of a sudden BAM... I had power. But at the same time blue smoke started pouring out the right pipe. So I know its a problem with cyl. 3 or 4. The left side had always burned a little oil but not like this was. It rode good for a little while and then it started getting jumpy. With a steady control on the throttle it would zoom and then slow down. I can clearly hear the 1 and 2 cyl. firing through the exhaust but the 3 and 4 exhaust is almost dead quiet at times. I don't know quite what to think broke. At first my guess was that some crud was cleared out of the carbs and it was finally running right. But with it running the way it is I'm not so sure. Any ideas?
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post #2 of (permalink) Old 09-18-2003, 07:38 AM
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Re: O/T - Motorcycle runs rough - basic engine ?

Do a compression check of the cylinders to see if they are all working. While you have each plug out, check for spark on all plugs.
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post #3 of (permalink) Old 09-18-2003, 07:45 AM
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Re: O/T - Motorcycle runs rough - basic engine ?

A little trick I sometimes use to check for a cylinder firing is to hook up a inductive timing light on each cylinder to see how the cylinder is firing.
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