Intermitant fault - no idle

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islandboy
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Intermitant fault - no idle

Post by islandboy »

Got 1987 1.9 Petrol watercooled DG.

Generally the engine runs beautifully with perfect idle tick-over. Occasionally, the idle disappears completely and whenever I stop at a junction/roundabout etc. the engine will cut out. I can only keep it going with some nifty accelerator/clutch/handbrake activity. The next day, everything can be fine.

Any suggestions ?

many thanks
1987 DG 1900 petrol plus Yamaha Midnight Star and Yamaha Virago and !979 Vespa P125X

Davidkirk
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Re: Intermitant fault - no idle

Post by Davidkirk »

Mine was the same. I changed every vacuum pipe. Still the same. Took the carb off an cleaned it to within an inch of its life. Blew out all the little holes in the carb. Then it was like a different motor. Worth a try if you not already done it. Dave

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CovKid
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Re: Intermitant fault - no idle

Post by CovKid »

And check for wear in any parts that rotate in the carb - particularly throttle flap. Air leaks there (even slight ones) can play havoc with idling and can be intermittent. Your engine likes a known fuel/air mix at idling to remain in a stable state.
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islandboy
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Posts: 166
Joined: 14 Feb 2012, 19:17
80-90 Mem No: 10711
Location: Ryde, Isle of Wight

Re: Intermitant fault - no idle

Post by islandboy »

Many thanks folks, will give it some attention
1987 DG 1900 petrol plus Yamaha Midnight Star and Yamaha Virago and !979 Vespa P125X

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