Disconnected line 1986 FJ1200

[chocker]

Do you have an aftermarket ignition?

The diaphragm in the ignition box may be blown out.  See if you can pull a vacuum on the ignition side before you plug it back in.

Also, I think the plastic "joint" you are referring to is a vacuum check valve.  It's purpose is to prevent an intake backfire from rupturing the vacuum diaphragm in the ignition box (it isn't always successful).

If the ignition won't hold a vacuum, plug the line going to the carb to stop the vacuum leak.

DavidR.

It seems to be the original ignition box. I'm sorry but I don't understand " See if you can pull a vacuum on the ignition side before you plug it back in." What do you mean by that.

[chocker]

Do you have an aftermarket ignition?

The diaphragm in the ignition box may be blown out.  See if you can pull a vacuum on the ignition side before you plug it back in.

Also, I think the plastic "joint" you are referring to is a vacuum check valve.  It's purpose is to prevent an intake backfire from rupturing the vacuum diaphragm in the ignition box (it isn't always successful).

If the ignition won't hold a vacuum, plug the line going to the carb to stop the vacuum leak.

DavidR.

Sorry for my ignorance but what do you mean by " See if you can pull a vacuum on the ignition side before you plug it back in."

[SlowOldGuy]

Connect a vacuum line to the vacuum port on the ignition box (early models) or the boost sensor (later models) and see if it will hold a vacuum.  By that, I mean if you suck on it, does it hold the vacuum or do you have to keep sucking. 

I really hate having to describe that....

DavidR.

[chocker]

Do you have an aftermarket ignition?

The diaphragm in the ignition box may be blown out.  See if you can pull a vacuum on the ignition side before you plug it back in.

Also, I think the plastic "joint" you are referring to is a vacuum check valve.  It's purpose is to prevent an intake backfire from rupturing the vacuum diaphragm in the ignition box (it isn't always successful).

If the ignition won't hold a vacuum, plug the line going to the carb to stop the vacuum leak.

DavidR.

Sorry for my ignorance but what do you mean by " See if you can pull a vacuum on the ignition side before you plug it back in."

[chocker]

Do you have an aftermarket ignition?

The diaphragm in the ignition box may be blown out.  See if you can pull a vacuum on the ignition side before you plug it back in.

Also, I think the plastic "joint" you are referring to is a vacuum check valve.  It's purpose is to prevent an intake backfire from rupturing the vacuum diaphragm in the ignition box (it isn't always successful).

If the ignition won't hold a vacuum, plug the line going to the carb to stop the vacuum leak.

DavidR.

Sorry for my ignorance but what do you mean by " See if you can pull a vacuum on the ignition side before you plug it back in."

I would like to apoligize for the same entry over and over. I was having trouble with my computer and it was staying in the same session therefore it wasn't showing my new post.

Sorry,
Mark

[chocker]

Do you have an aftermarket ignition?

The diaphragm in the ignition box may be blown out.  See if you can pull a vacuum on the ignition side before you plug it back in.

Also, I think the plastic "joint" you are referring to is a vacuum check valve.  It's purpose is to prevent an intake backfire from rupturing the vacuum diaphragm in the ignition box (it isn't always successful).

If the ignition won't hold a vacuum, plug the line going to the carb to stop the vacuum leak.

DavidR.

Sorry for my ignorance but what do you mean by " See if you can pull a vacuum on the ignition side before you plug it back in."

I would like to apoligize for the same entry over and over. I was having trouble with my computer and it was staying in the same session therefore it wasn't showing my new post.

Sorry,
Mark

Well I reconnected the vacuum hose and the bike runs much better. Once up to running temp it idles great and steady and no more backfire.

Thanks everyone for the help,
Mark