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Carburettor icing XTZ 660 Carburettor icing XTZ 660
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 25 Oct 2002
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Location: Larne, N.Ireland
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Carburettor icing XTZ 660
We have had some frosty mornings lately (-3C) yet dispite letting the bike warm up properly, once I ride off and she draws in the cold air the bike begins to splutter and cough, also backfiring especially when the throttle is closed. Is this a symptom of carb icing? The bike runs well every other morning when there is no frost.
Could anyone suggest what I might try to cure this problem.
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  #2  
Old 25 Oct 2002
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Location: Hendrik Ido Ambacht, Holland
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Try a K & N air filter !

------------------
Fred, XTZ660, Holland.
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Fred, XTZ660, Holland.
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Old 25 Oct 2002
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It could be, although I'm wondering if you are " warming " the bike up by letting it idle a few minutes with the choke on ? This is not advisable. Ride way immediately on starting, and close ( turn off ) ther choke a.s.a.p. Leaving the choke on for too long will flood the carbs ( and ensure your pistons are getting less oil, essential when cold ) and is MAYBE the cause of your grief.
Keep the revs very low for the first mile or so.
Popping in the exhaust when closing the throttle could indicate holes in the exhaust system.
If not the above, then yes, it sounds like icing! There are little warm up heaters attached to many new bikes now, and perhaps you could consider buying these. The bike manufacturers blame our petrol for icing, and they have a pretty solid case. There are additives, too, but I have little experience of using them. Silkolene's additive had a good review.
Still, watch that choke first!!
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  #4  
Old 26 Oct 2002
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Thanks lads;
John, your right - I do let the bike warm up with the choke on for a couple of minutes until it can idle nicely without it,(usually doesn't take long) then I ride off. I will try your suggestion on the next frosty morning and let you know.

Fred, I still haven't printed out that microfiche yet. Will get round to it sometime soon.
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