High idle without choke!

If it's broken or just needs tweaked

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AndrewCB650
Posts: 32
Joined: Wed Mar 11, 2015 8:18 pm

High idle without choke!

Postby AndrewCB650 » Sun Sep 25, 2016 3:52 pm

Hello, I just did a valve adjustment, cleaned/rebuilt my carbs, static timing check.. and now my bike is idling at 4K rpm without the choke. Any ideas why this is? I adjusted the pilot screws by 1/2 turns, in/out but the idle did not change, currently the mixtures screws are back to 2 1/4 turns out. I've got new gas in the tank, I checked the spark plug gaps which are set to the manual specs, timing is set correctly, carbs have been synchronized.. I dont know what could be causing this.. could this be an issue with the valves? I only had to adjust the #3 exhaust clearance when doing the valves. also checked the throttle which is set with 1/4 turn of free play as recommended in the manual. Need help with this one, I must have overlooked something!

Any advice it very appreciated!

navydad
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Re: High idle without choke!

Postby navydad » Sun Sep 25, 2016 4:45 pm

Did you try adjusting the idle screw. My 81 has a screw with a large knob on it sticking out at the bottom between the second and third carbs, this is the idle adjustment.

AndrewCB650
Posts: 32
Joined: Wed Mar 11, 2015 8:18 pm

Re: High idle without choke!

Postby AndrewCB650 » Sun Sep 25, 2016 5:11 pm

:lol: I feel dumb. The knob was way off. I got it adjusted and idling at 1.5k rpm. My brain is fried, been working on this bike all day, I always miss the simple things. Thank you sir

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Folsoml
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Re: High idle without choke!

Postby Folsoml » Mon Sep 26, 2016 4:15 am

We've all been there with one thing or another.
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navydad
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Re: High idle without choke!

Postby navydad » Tue Sep 27, 2016 5:59 pm

+1 on the fact we have all been there, just glad it was that simple and I could be of some help.

MEHall
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Location: Sweden

Re: High idle without choke!

Postby MEHall » Wed Sep 28, 2016 4:24 pm

1500 rpm is a bit high though, between 1100 to 1400 rpm is what the manual says. :wink:
My cb 650 will rev about 1100 rpm when it's warm enough to go on idle without choke and around 1400 rpm when it have reached optimal temp. :wink:




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Riding bikes? I ride where ever i want and whenever i want. :wink:

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AndrewCB650
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Joined: Wed Mar 11, 2015 8:18 pm

Re: High idle without choke!

Postby AndrewCB650 » Tue Oct 18, 2016 2:28 pm

Yea, it's a bit high but 1.5k after fully warm is okay for now. I still have a lot of fine tuning to do :D . Thanks for all the feedback guys!

cb650
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Re: High idle without choke!

Postby cb650 » Wed Oct 19, 2016 5:30 am

I keep mine at about 14 to 15 k just to help the charging
Did you clean the tank out?!?!?!?!

MEHall
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Location: Sweden

Re: High idle without choke!

Postby MEHall » Wed Oct 19, 2016 11:52 am

1100 to 1400 is the right RPM at idle and the generator dont start to charge until you hit 3000 RPM. :roll:




8)
Riding bikes? I ride where ever i want and whenever i want. :wink:

Online manual: http://cosky0.tripod.com/

cb650
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Re: High idle without choke!

Postby cb650 » Wed Oct 19, 2016 3:33 pm

all mine charge at 1500 12.5 v then 13.5 at 2k
Did you clean the tank out?!?!?!?!

MEHall
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Location: Sweden

Re: High idle without choke!

Postby MEHall » Thu Oct 20, 2016 1:02 pm

Well what i have noticed on mine CB650 is that the headlight only get full effect at 3000 rpm and up in dark enough surroundings. :wink: Have'nt checked with any electrical tool though. :roll:
Riding bikes? I ride where ever i want and whenever i want. :wink:

Online manual: http://cosky0.tripod.com/

cb650
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Re: High idle without choke!

Postby cb650 » Thu Oct 20, 2016 3:32 pm

maybe yours need to be cleaned up and checked out. I been cleaning all the contacts on mine. I have never had a charging problem one any of mine but with all the reports I been doing preventive maintenance.
Did you clean the tank out?!?!?!?!

MEHall
Posts: 403
Joined: Mon Nov 15, 2010 8:25 am
Location: Sweden

Re: High idle without choke!

Postby MEHall » Sat Oct 22, 2016 1:58 pm

New rotor, regulator and have changed the electrical harness due to lack of charging.
So i think it's no problem there. :wink: What i have notice is that the headlight reaches full effect when RPM reaches 3000 so it may start to charge at lower RPM, have'nt checked yet, so far it just works ok. :wink:





8)
Last edited by MEHall on Sun Oct 23, 2016 9:57 am, edited 1 time in total.
Riding bikes? I ride where ever i want and whenever i want. :wink:

Online manual: http://cosky0.tripod.com/

cb650
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Joined: Fri Mar 03, 2006 7:20 am
Location: Denver CO USA
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Re: High idle without choke!

Postby cb650 » Sat Oct 22, 2016 4:09 pm

if it works dont touch it LOL
Did you clean the tank out?!?!?!?!


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