RGS1000 lazy LH cylinder warm up

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I doubt if you should be concerned if it is running well once hot,It could just be down to a lazy plug, or a slight fuelling difference/blockage or setting with the pilot system on that cylinders carb.
I would check the simple things first, plugs,carbs synced,no air leaks,choke plunger rubbers condition and settings,cable free play etc.fuel air screw mixture settings as well and see how you go before digging further.
 
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Yes to all the above but make sure all plugs are in good shape and gapped properly. Next step would be examining the carb internals and check for proper float level ( and the floats themselves). But it sounds like it runs OK once warmed up?
 
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Ringo said:
When I start my RGS1000 the lefthand cylinder seem to take longer to warm up than the other two is this normal once hot runs should I be concerned
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First thing be concerned about is your lack of punctuation. Apologies if that sounds a bit pedantic, but your query requires a bit of thought to ferret it out of the continuous string of words. Especially for readers for whom English is a second language - as Love..rda implied in his post.

As for the cool left cylinder, from which side of the bike is the wind blowing?

OK. I'll be serious for a minute. Schurminater and Andy are on the money. But if it isn't a faulty plug, it's most likely a fuelling issue.

If it runs OK when you're actually riding it, then the main/needle jet passages are probably OK on all carbs. Likely candidates would be carby slides out of synch, a blocked idle jet, incorrect float height, or differences in the settings of the choke (enricher jet).

A couple of questions for your homework in case a new set of plugs doesn't cure it:
(Answers will be marked as incorrect if they lack punctuation. ;))

Do you use the choke to start it? If so, how long before you turn it off?
Once the choke is off, does the left cylinder stay cool? If it does, then it's not likely to be choke synch.
Have you checked the slide synchronisation? (ie. balance of carbs)
Does it idle OK? Poor idling could be a symptom of the carbs being out of tune.

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I had the problem with the right cylinder which did not work at low revs. When the bike was running on the road it was working but the pug was white and the cylinder was running lean. The issue was that a plug which was closing the starter jet channel felt out of the carb. So there was an open hole in the carb where it permanantly has got false air.
 

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