79 CB650 Blocking the Air Cut Off Valves

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gaillarry
Posts: 27
Joined: Sat Sep 18, 2010 6:11 am
Location: Northern Ontario, Canada

79 CB650 Blocking the Air Cut Off Valves

Postby gaillarry » Sat Mar 03, 2012 2:21 pm

Read a previous post about blocking the air cut off valve inlet. Trying to replace the valves is a PIA as the carbs have to be separated.

I'm thinking of using a cutoff finishing nail and epoxy to block the inlet as shown below:

Image

Any good or bad comments before I do this?

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Volker_P
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Joined: Mon Mar 06, 2006 1:53 am
Location: southern Germany

Re: 79 CB650 Blocking the Air Cut Off Valves

Postby Volker_P » Sun Mar 04, 2012 6:17 am

If you like to insert steel parts, you have to be really sure they stay there in place. Less critical seems pure epoxy or soft soldering tin.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

gaillarry
Posts: 27
Joined: Sat Sep 18, 2010 6:11 am
Location: Northern Ontario, Canada

Re: 79 CB650 Blocking the Air Cut Off Valves

Postby gaillarry » Sun Mar 04, 2012 6:20 am

I did a test fit and the nail is snug, the nail head will prevent it from being sucked into the carbs.

I'll install them today and post back the results.

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Volker_P
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Joined: Mon Mar 06, 2006 1:53 am
Location: southern Germany

Re: 79 CB650 Blocking the Air Cut Off Valves

Postby Volker_P » Sun Mar 04, 2012 6:30 am

gaillarry wrote:I did a test fit and the nail is snug,
In this case Loctite may be a good idea.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

gaillarry
Posts: 27
Joined: Sat Sep 18, 2010 6:11 am
Location: Northern Ontario, Canada

Re: 79 CB650 Blocking the Air Cut Off Valves

Postby gaillarry » Sun Mar 04, 2012 6:55 am

Loctite it is.

I'm going by this thread:

http://www.hondacb650.com/viewtopic.php?f=4&t=722&hilit=air+cut+off+valve&start=30

It mentions blocking off the other side - but where? I'm just doing the ones circled in my picture.

gaillarry
Posts: 27
Joined: Sat Sep 18, 2010 6:11 am
Location: Northern Ontario, Canada

Re: 79 CB650 Blocking the Air Cut Off Valves ( SUCCESS )

Postby gaillarry » Mon Mar 05, 2012 3:53 pm

Got the carbs back on again and the bike started right up, only needed the choke for 2 minutes, then it idled smoothly and good throttle response.

I just plugged the air box side of the carbs. I'm very impressed with this mod.

It's cold outside ( -24C )and we had 25cm of snow yesterday, so a test ride is on hold.


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