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one cylinder "drops"

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Dr. DaveJPS
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Joined: 24 May 2008
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PostPosted: 15:02 - 19 Apr 2009    Post subject: one cylinder "drops" Reply with quote
right i have a classic bike, and the right hand cylinder won't run without choke on, now i don't think it's the carb as is single carb and the left hand doesn't do this. also at high throttle the choke acts as a speed limiter (as in more choke faster top speed)

any suggestions as to the cause?
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Billing
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Joined: 12 Mar 2009
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PostPosted: 15:05 - 19 Apr 2009    Post subject: Reply with quote
could there be an air leak on that cylinder? it could be running lean as its getting too much air and the choke brings it back to the right A/FR range
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Dr. DaveJPS
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PostPosted: 15:12 - 19 Apr 2009    Post subject: Reply with quote
it could be, how would i test this...?
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Coxyzxr
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Joined: 22 May 2008
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PostPosted: 15:41 - 19 Apr 2009    Post subject: Reply with quote
DaveJPS wrote:
it could be, how would i test this...?


Quick test would be spraying WD40 around areas/connections/boots/seals where the induction runner is.

Revs/idle etc should increase momentarily whilst the WD tempoarily seals it.
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Billing
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PostPosted: 15:41 - 19 Apr 2009    Post subject: Reply with quote
firstly check for splits and cracks in the inlet, when the bike is running listen for any hissing, maybe put a little bit of washing up liquid around the inlet and watch for bubbles.
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"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
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Finglonga
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Joined: 27 Jul 2004
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PostPosted: 16:16 - 19 Apr 2009    Post subject: Reply with quote
Take it you have checked the plug is ok?
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Dr. DaveJPS
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PostPosted: 16:26 - 19 Apr 2009    Post subject: Reply with quote
i don't think it is the plug as put a new pair in this morning, might be the HT lead though, but i'll do the air leak test on tues and report back
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Dr. DaveJPS
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PostPosted: 19:55 - 21 Apr 2009    Post subject: Reply with quote
well sprayed WD40 in and it didn't seem to increase the revs on that cyclinder, (scientifically tested by putting my hand over the exhaust). am gonna test if it is HT lead/ingnition based tommorrow. unless anyone has more suggestions?

EDIT: also i have a some sludge at the bottom of the oil tank, is there any way to remove this without unbolting it and flushing it with petrol?
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Old Thread Alert!

The last post was made 16 years, 37 days ago. Instead of replying here, would creating a new thread be more useful?
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