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79 CB650 Blocking the Air Cut Off Valves

Posted: Sat Mar 03, 2012 2:21 pm
by gaillarry
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?

Re: 79 CB650 Blocking the Air Cut Off Valves

Posted: Sun Mar 04, 2012 6:17 am
by Volker_P
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.

Re: 79 CB650 Blocking the Air Cut Off Valves

Posted: Sun Mar 04, 2012 6:20 am
by gaillarry
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.

Re: 79 CB650 Blocking the Air Cut Off Valves

Posted: Sun Mar 04, 2012 6:30 am
by Volker_P
gaillarry wrote:I did a test fit and the nail is snug,
In this case Loctite may be a good idea.

Re: 79 CB650 Blocking the Air Cut Off Valves

Posted: Sun Mar 04, 2012 6:55 am
by gaillarry
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.

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

Posted: Mon Mar 05, 2012 3:53 pm
by gaillarry
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.