GS1000 fine tuning idle

[Reinhoud]

Gents, I just can't get my idling right.

After a ride the revs on idle go up and down, now it looks like it's sort of running on 3 cylinders, runs a bit "heavy". When the engine isn't real hot it seems to be alright, as soon as I open the throttle it runs fine

Been turning the idle srews in and out, can't find the sweet spot.

 

Valve clearence, sync, ignition is all ok. AFR seems to be fine too.

Anyone who might have an idea what might be wrong?

 

Thanks

[Blubber]

Check for excessive play on the connecting rods in your carbs ? 

This causes air leakage on the butterfly feedthrough's playing havoc with idle.

[Reinhoud]

1 hour ago, Blubber said:

Check for excessive play on the connecting rods in your carbs ? 

This causes air leakage on the butterfly feedthrough's playing havoc with idle.

Aha, will do. That's something I wouldn't have thought of myself..

 

Can I test that by spraying brake clear or something else flammable on the carbs while the engine is running?

[gs7_11]

All I've ever done is set the screws to the factory settings and balanced them. Works every time for me.

BUT.......this assumes you don't have any air leaks, flooding carbs, blocked air drillings, tight valves, dodgy HT leads etc.

Point is, if it doesn't idle correctly, it's probably NOT the idle adjustment. (Again assuming the screws are set to the factory settings).

[gsxwill]

My first port of call on the Gs was always spray a bit of carb cleaner on the rubbers to check for air leaks

[bluedog59]

Have you checked/set the airscrews ?

[Reinhoud]

I've been fidling around with the air screws, adjusted them till the AFR read 12, seems to run best on that.

I did the tuning this time after a 50km ride, I think that made a difference too

 

I also raised the idle rpm a little bit, just a little bit, and now it runs fine. have to get used to the higher idling, almost 1500rpm, pretty sensitive in that rev range

Edited February 19, 2022 by Reinhoud

[fab]

1500 rpm is too high, it should be 1000_1100rpm

i think you still have carb issues,that you need to fix

Edited February 19, 2022 by fab

[Reinhoud]

Came across an old topic of myself..

Better give an update;

Adjusted the AFR with an O2 sensor with gauge, still didn't idle ok.

Decided to get myself a colour tune, turned out the pilot jets were too small, had 40 in it, needed to be 45.

For some reason I got the AFR ok, but with the colour tune I couldn't get the flame point yellow. Adjusted the screws till the flame point went just blue.

Now it runs way better.

Engine rattles way less, I have straight cut primary gears what used to be a bit noisy, and that's a lot quieter now.

 

I got myself a color tune because with this the carburfuckingettors are tuned independantly, this is not the case with a O2 sensor with gauge.

Edited July 16 by Reinhoud