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Author Topic: High Idle??  (Read 6944 times)

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Offline jstfkndi

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Re: High Idle??
« Reply #50 on: June 18, 2012, 05:54:14 AM »
Ok. Have a question. Got everything taken apart and replaced the brass and gaskets, cleaned the hell out of the carbs and go them back on the bike :) Now the only brass I didn't replace was the jet needle (screws weren't budging and I was afraid of stripping them). On one of the needles, I decided to try and scrub the light gunk off with a green pad. I noticed it scored the surface a bit so decided against doing the others. Would this compromising of the surface of the jet needle affect the way the bike runs ie: cool, hot, rich, lean? Can it be THAT finicky? 
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Offline flybox1

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Re: High Idle??
« Reply #51 on: June 18, 2012, 06:45:45 AM »
Should be fine.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline jstfkndi

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Re: High Idle??
« Reply #52 on: June 18, 2012, 07:21:07 AM »
Then I have some investigating to do :(
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Offline flybox1

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Re: High Idle??
« Reply #53 on: June 18, 2012, 07:44:20 AM »
whats your symptom?
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline jstfkndi

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Re: High Idle??
« Reply #54 on: June 18, 2012, 08:35:14 AM »
Number four cylinder pipe is running cooler than the other three. I checked spark and have that. Going to compression test tonight on all cylinders. It was warm, but not sizzling like the others when water was sprayed at them.
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Offline flybox1

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Re: High Idle??
« Reply #55 on: June 18, 2012, 08:46:26 AM »
vacuum sync your carbs after you got them back on?
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline jstfkndi

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Re: High Idle??
« Reply #56 on: June 18, 2012, 10:03:24 AM »
Not yet. I need to also do the idle/air screw mixture. That could do it?
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Offline JTF

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Re: High Idle??
« Reply #57 on: July 25, 2014, 11:08:06 AM »
So what happened? Did you find a reason for high idle?

I have the very same problem in my CB350F.

BR Jussi
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Offline Sparked

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Re: High Idle??
« Reply #58 on: April 27, 2015, 09:05:46 PM »
Double check valve clearances. I loosened the valve gaps 0.001" and the high revs when warm seem to have gone away.
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1972 CB350F
1982 CM450A
1961 Ford Falcon (time for four wheels)
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