[bryantjt]

Can someone with the factory manual tell me what the baseline setting for the fuel mix screws is? Ours is very boggy from 1500-4000 rpm and then it opens up with ease. It is remedied somewhat by pull the choke out part way.

 

[66Sprint]

The factory setting for the '79 T was 1 & 1/2 turns out....The '79 A was 1 & 3/4......The '80's were pre-set 2 full turns out...... So that's your range.......
The '79 and '80 bikes were particularly sensitive to air cleaner condition and specify replacement at 7,200 miles (paper) or cleaning/re-oiling every 3,600 miles (foam)... Oil with 90 wt gear oil.....
The fast idle lever must be adjusted with the carbs off, throttle-stop screw completely backed off until the throttle butterflys completely close, and adjusted (bent) for 1.2mm clearance between fast-idle lever and the throttle drum.............

Hope this info is what you needed..... Steve

 

[bryantjt]

Thanks!

 

[bryantjt]

Checked them tonight and mine were set at 3 turns out. I put them back to 1 1/2 and it made no discernible difference. I'm guessing I need to pull the carbs again and clean them out again as it seems very lean on the low end.

 

[KERRY]

Those screws just adjust the idle mixture. When you're riding, that setting won't affect your mixture.

 

[bryantjt]

I've always referred to this chart when trying to determine what does what.

My KLX250S was very picky about where the idle air screw was. If I went more than the factory setting I could get more punch right off idle, but if it sat idling like at a stop light it would load up and stall. I assumed these carbs were similar but that doesn't seem to be the case.