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Author Topic: Which problem do you think is more likely, advancer or air leak?  (Read 1160 times)

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Offline fmctm1sw

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Which problem do you think is more likely, advancer or air leak?
« on: February 05, 2012, 02:18:24 PM »
I got my 550 started today.  Timing is spot on and I rechecked two of the idle jets for obstructions.  If you rev it the bike will hang around for a while at higher RPMs.  It does this most of the time but seemingly more as it gets hotter.  I did a lot of spraying of WD40 on the boots and connection to the head with no change.  As mentioned, the timing is right on.  I do notice my advance stays advanced while it is revving like that, but that may be a product of the high idle I guess.  So which do you think is more likely?  A sticking timing advancer or an air leak somewhere?  Idle is a little dicey but I decided to try to get it to the end of the street.  To my surprise, once I got launched, it ran great.  I could only get into third gear with it before I ran out of road though.  The exhaust has grown on me, but it's loud and perhaps an accomplice in the mystery that is my idling issues.  ???
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Offline Gordon

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Re: Which problem do you think is more likely, advancer or air leak?
« Reply #1 on: February 05, 2012, 02:21:37 PM »
If you're not getting any change in idle speed when spraying the intake boots, then it's probably not a leak.  Could also be that the carbs are out of balance.  It's easy to check the movement of the advance mechanism, though, so might as well do that first. 
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Offline fmctm1sw

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Re: Which problem do you think is more likely, advancer or air leak?
« Reply #2 on: February 05, 2012, 02:23:18 PM »
Quote from: Gordon on February 05, 2012, 02:21:37 PM
If you're not getting any change in idle speed when spraying the intake boots, then it's probably not a leak.  Could also be that the carbs are out of balance.  It's easy to check the movement of the advance mechanism, though, so might as well do that first.

No... haven't balanced them yet.  Good thought, thanks...
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline eldar

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Re: Which problem do you think is more likely, advancer or air leak?
« Reply #3 on: February 05, 2012, 02:57:22 PM »
Are you sure your slides are closing? Wouldn't be the first time someone forgot to turn back their idle knob. :)
Always worth checking as it takes a couple seconds.
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Offline magconpres

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Re: Which problem do you think is more likely, advancer or air leak?
« Reply #4 on: February 05, 2012, 10:43:29 PM »
I may be wrong, but I don't see how the advance unit sticking would keep the revs up.  If the fuel isn't there to support the revs.  I think you have some sort of fuel mixture problem.
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Offline Hush

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Re: Which problem do you think is more likely, advancer or air leak?
« Reply #5 on: February 06, 2012, 02:26:27 AM »
I'd go for the carb balance, when your advancer sticks you usually can't get higher revs when riding. :)
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Offline trueblue

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Re: Which problem do you think is more likely, advancer or air leak?
« Reply #6 on: February 06, 2012, 04:10:58 AM »
I had an issue like that with my 650 when I got it and it turned out being my cam timing out a tooth and I also had an extra link in the cam chain. Replaced the cam chain and timed it correctly and it got rid of the timing chain buzz, stumbling idle, hanging revs, lack of power and hard starting all in one hit
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