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Idle problem

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phisnik

Idle problem

This post was updated on .

Hello. I'm new to the forum. In the past few months I have read such useful information on here. I have a 1982 cb750k which I bought with the carbs out and misc pieces. Been working on it for a few months putting it back together. I cleaned the carbs and put them back on. Started it up and the rpms were at5 I adjusted the idle screw then it shut off. I tried all afternoon to get it between 1 and 2 rpms but its as if the idle screw didn't work and would either make it rev really high or it wasn't able to stay running. Any thoughts are appreciated. Thanks

A good traveler has no fixed plans, and is not intent on arriving.

TOOLS1

Re: Idle problem

Administrator

Classic vacuum leak.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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phisnik

Re: Idle problem

Thanks Tools.

A good traveler has no fixed plans, and is not intent on arriving.

Re-run

Re: Idle problem

Administrator

In reply to this post by phisnik

Might not be a vacuum leak. On my v45 with cv carbs, a bad sync caused the idle to be sky high and I couldn't get it to drop at all. Once I got it bench synced right, idle was normal.

Granted it was a bank of V carbs but they work essentially the same.

The ride IS the adventure. The destination is just to get gas!

TOOLS1

Re: Idle problem

Administrator

I could have went into a lot of detail about probable causes, but since he said that he had had them off for cleaning, most likely it's a vacuum leak.

And that is where I would start looking.
TOOLS

phisnik

Re: Idle problem

In reply to this post by Re-run

I'll start by searching for the vac leak first. I'll have to study up on the bench sync as well. Thank you.

A good traveler has no fixed plans, and is not intent on arriving.

Re-run

Re: Idle problem

Administrator

In reply to this post by TOOLS1

He did say he cleaned them and as we know, that means taking things apart. I was throwing my experience out there as when it first happened, I thought leak too and it turns out it wasn't. My issue was very similar. Stupid carbs!

The ride IS the adventure. The destination is just to get gas!

gkmaia

Re: Idle problem

In reply to this post by phisnik

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phisnik

Re: Idle problem

I removed and cleaned the fuel mixture screws, gaskets and replaced the air cut off diaphram.

A good traveler has no fixed plans, and is not intent on arriving.

phisnik

Re: Idle problem

In reply to this post by TOOLS1

I Tightened up the boots and sprayed carb cleaner to check for leaks, so far so good. But I did have a prob with the throttle sticking but at the carb somewhere. There is also a knocking sound near the middle of the engine. I managed to take a video while it was idling somewhat ok. Any thoughts or suggestions,thanks.

https://www.youtube.com/watch?v=OWXflFDcT-M&feature=youtube_gdata_player

A good traveler has no fixed plans, and is not intent on arriving.

phisnik

Re: Idle problem

In reply to this post by Re-run

Thanks I checked the hoses and clamps.

A good traveler has no fixed plans, and is not intent on arriving.