[wildfire]

I recently(about 2 weeks ago) rebuilt the carbs on my 85 GL1200 using Randaks Kit and gave it a brief ride to check it out. As far as I remember the bike rode fine. Yesterday I noticed that the engine was a bit slow to respond to the throttle and also slowish to return to idle speed.

My first thought was throttle cable but I actually disconnected it and revved the engine by hand but the same problem existed. It seems to be at its worst rising to and dropping from 3000 rpms. You can hear and see the butterfly on the linkage snapping closed without hesitation.

Idle screws are set at factory specs and carbs are synced . Any ideas?

 

[Anim8or Earl]

Have you checked the color of the spark plugs to see if they are burning the right mix?

 

[wildfire]

Have you checked the color of the spark plugs to see if they are burning the right mix?

I replaced the spark plugs with new ones when I did the carbs so I am expecting it will take a while for them to take on a color.

 

[wildfire]

Idle screws are set at factory specs and carbs are synced . Any ideas?[/QUOTE]


I meant to write pilot screws are at factory recommended number of truns not idle screw.

 

[blackknytecnc]

I replaced the spark plugs with new ones when I did the carbs so I am expecting it will take a while for them to take on a color.

Actually, if you have fresh plugs it's a good time to check. If it's running rich, the black deposites happen pretty quick.

 

[wildfire]

Actually, if you have fresh plugs it's a good time to check. If it's running rich, the black deposites happen pretty quick.

Nope no sign of black deposits. but, having said that it would have about 1.5 hours running time since I replaced the plugs.

 

[blackknytecnc]

In that case maybe a lean condition. What kind of condition are the fuel filter/tank inlet in?

 

[dizzy]

From the little description you gave, it sounds like it's not running on all four cylinders. Are all the plugs looking the same?

 

[wildfire]

From the little description you gave, it sounds like it's not running on all four cylinders. Are all the plugs looking the same?

Wouldn't losing a cylinder give show a lot more problems?

 

[Bike...and Dennis]

Those symptoms can indicate an out-of-sync condition.

Also might be slide related. How are the diaphragms?

 

[dizzy]

"Slow to respond" was the phrase the prompted me to speculate you were missing a cylinder. The slide diaphragms Dennis mentioned also crossed my mind. I've found they sometimes are really difficult to get back in place properly.

 

[ding dong]

You might want to also check for vacuum leaks.

 

[wildfire]

OK problem solved. Dizzy was very close to the mark about all cylinders not running. While all cylinders were running it turned out to be a faulty spark plug. It was the right type of plug and gap was correct. It was however sparking at a very weak rate. Replaced it and problem gone.

All spark plugs were new so I suppose moral of the story is just because a part is new dont overlook it as not been the cause of a problem.

Thanks for all the suggestions.