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Post by Thud300 on May 17, 2015 18:16:08 GMT -6
Been riding my '89 quite a bit lately, and I've noted that on a cold start, it lights right up on the left cylinder, but for the first few minutes of running, it runs rough and the right exhaust pipe is cool to the touch while the left is hot... after that the right cylinder will catch up. My compression is good, about 150 for each cylinder, slightly lower on the right, and it doesn't seem to lack any power once it's good and warm. The spark plugs are fresh and the coils are definitely firing, trading the plugs and wires across cylinders made no difference.
Wondering if I damaged an air boot when servicing the carbs. Would a vac leak account for this?
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Post by Blaine on May 17, 2015 18:53:35 GMT -6
Been riding my '89 quite a bit lately, and I've noted that on a cold start, it lights right up on the left cylinder, but for the first few minutes of running, it runs rough and the right exhaust pipe is cool to the touch while the left is hot... after that the right cylinder will catch up. My compression is good, about 150 for each cylinder, slightly lower on the right, and it doesn't seem to lack any power once it's good and warm. The spark plugs are fresh and the coils are definitely firing, trading the plugs and wires across cylinders made no difference. Wondering if I damaged an air boot when servicing the carbs. Would a vac leak account for this? Possibly,or carbs outta sic.Also when was the last valves were checked/adjusted?
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gonzo
Junior Member
For the 1st time ever I don't like the snow
Posts: 215
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Post by gonzo on May 25, 2015 22:07:39 GMT -6
I'm having the exact same problem. Even changed the coils over, left to right. Valves are correctly set, carbs are spotless and balanced with a fancy set of vacuum gauges borrowed from a local bike shop. That took a while! But it runs on one cylinder until warm, then the right kicks in. I'm not sure I trust my multi meter as it shows differing numbers, but high resistance from the IC to the coils.
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Post by Blaine on May 26, 2015 4:39:24 GMT -6
Make sure your Plug wire caps are good.The resistors can go bad in them.I had one go bad & it drove me nuts for a month till I found the problem.
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Post by ariklee on Jun 6, 2015 13:01:17 GMT -6
Resistors in the wire caps? I didn't know that. I'm having the same issue with the bike I'm trying to sell. I'll check resistance of each wire. What should the resistance be?
Arik
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Post by Blaine on Jun 6, 2015 13:34:20 GMT -6
Resistors in the wire caps? I didn't know that. I'm having the same issue with the bike I'm trying to sell. I'll check resistance of each wire. What should the resistance be? Arik Im not sure.I just know when one went bad on me I had a miss at low RPM that drove me nuts till I caught it by accident.
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Post by Thud300 on Jul 7, 2015 19:31:18 GMT -6
Update on this, I made one of those two-bottle cheapo carb synchronizers and did the carb sync. The bike runs like a champ now, no more cold #2 pipe on a startup. Now if I could just get it to respond to the choke the way my Concours does. Still a bit cold natured. I'm taking it for a ride!
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Post by eaglerider on Jul 8, 2015 6:37:34 GMT -6
Sounds like the valves might be a bit tight....that will cause the engine to be a bit hard to start when cold.
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Post by Thud300 on Jul 9, 2015 10:33:30 GMT -6
It starts quickly, just doesn't fast idle as much as I'd like on the enrichener.
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Post by Blaine on Jul 9, 2015 18:02:05 GMT -6
It starts quickly, just doesn't fast idle as much as I'd like on the enrichener. Choke (enrichment) plunger may be sticking.
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