GL1200A - Mild backfiring during deceleration

[toytender01]

my 2 cents is air cut-off opcorn:

 

[Denver]

Probably :good:Often pays to look at as much as you can grasp, at the time your there :smilie_happy:

 

[bronko37]

slabghost » Tue Oct 06, 2015 6:56 pm[/url]":3fmnlirv]
Personally I like the little backfiring on decel. As long as it's out the exhaust I think it causes no harm at all.

Mine was not the cool growling tiny, rapid succession backfire like you hear on a lot of Hardleys. It was just one loud pop, then on the next decel another, and so forth; I hated it. Eliminating the secondary air supply system all together and blocking off the after burn valve has been a great fix. Well worth it IMO just to not have to deal with all that junk upon reassembly.

 

[joedrum]

:smilie_happy: see im not the only one who uses the word junk for some of honda engineering ...... :thanks: bronko :hihihi:

 

[Denver]

Lot like V W's problem with the pollution issues, :headscratch: it gets harder & harder to squeeze by regulations as time goes by. :hihihi:

 

[dan filipi]

Denver » 41 minutes ago[/url]":17jj1bid]
Lot like V W's problem with the pollution issues, :headscratch: it gets harder & harder to squeeze by regulations as time goes by. :hihihi:

More like a pollution scam than a issue.

 

[Write2Paul90277]

Hi bronko37,

Your posts make me want to bypass the whole air custom system! You said….

"I made plugs for my 1200 for the secondary air supply system. Completely eliminated it. Also made block off plate for the afterburn valve and eliminated it too. No more back fire and the bike runs great."

Is that all I have to do is (1) plug the four chrome pipes that lead from the plenum chamber to the engine block and (2) make a block-off plate for the anti afterburn valve and eliminate it?

Do I leave the reed valves in place? Does the purge control valve stay too? (Mine 1200 is a California model) There's also a slow air cut-off valve that I could either eliminate or just leave in place. What to do

It may have been a while since you did this work, so i'll understand if you don't remember all the details. I just don't want to go into this totally blind, only to find that I screwed something up or still have the backfiring problem.
Thx

Paul

 

[Denver]

Have to leave a good air cut off diaphram in to keep trap door shut, don't you? :headscratch:

 

[slabghost]

Denver » Fri Oct 16, 2015 8:39 pm[/url]":fue4we0a]
Have to leave a good air cut off diaphram in to keep trap door shut, don't you? :headscratch:

No. :hi:

 

[bronko37]

Write2Paul90277 » Tue Oct 13, 2015 9:12 pm[/url]":27wfnnkj]
Hi bronko37,

Your posts make me want to bypass the whole air custom system! You said….

"I made plugs for my 1200 for the secondary air supply system. Completely eliminated it. Also made block off plate for the afterburn valve and eliminated it too. No more back fire and the bike runs great."

Is that all I have to do is (1) plug the four chrome pipes that lead from the plenum chamber to the engine block and (2) make a block-off plate for the anti afterburn valve and eliminate it?

Do I leave the reed valves in place? Does the purge control valve stay too? (Mine 1200 is a California model) There's also a slow air cut-off valve that I could either eliminate or just leave in place. What to do

It may have been a while since you did this work, so i'll understand if you don't remember all the details. I just don't want to go into this totally blind, only to find that I screwed something up or still have the backfiring problem.
Thx

Paul

The air cuttoff valve will need to remain. There is a vaccume line that will need to be re routed since the afterburn valve is gone, i show this in the original thread and how to rout the line in the video. The reed box and all the hoses comming off of it will be removed from the rack. So yes 1 block the 4 holes that the lines ran into, 2 remove the reed box completely, 3 make a block off plate for the afterburn valve (the oring between the plate and valve will remain to seal those faces) and 4 reconfigure the vacuum line. The vaccume line part will be pretty obvious once u start to look at it.

Here are some pics that may help. You can see that the reed box is completely gone. This is what you will be left with at install.

 

[Denver]

Was going by the write up in the motorcycle project, :roll: forgot you eliminated the the whole system, & reed valves.

 

[Write2Paul90277]

.
Great reply, bronko37! Those were the specifics I was looking for. Now all I have to do is find the TIME to do the work.

Will report back some time in the not too distant future.

Many thanks. I appreciate your time.

Paul

 

[joedrum]

like it when i see the forum do it stuff ..great