carb tuning puzzling

[quawk]

As I have mentioned in another post, I have now gotten my bike to start and run and now am adjusting the carb. After tweaking the mixture screw and idle screw, I can get my bike to idle steadily at 1,000 rpm, but to do so, the mixture screw is turned in nearly to closed, maybe 1/8 of a turn out. From other posts it seems the normal mixture screw setting would be 3/4 to 1 full turn out. Was wondering does this possibly mean I still have some dirty/clogged internal jets and or passages? Any suggestions

[quawk]

To add to my above post, I have ordered a replacement float bowl cover and intake gaskets from Stuart. I of course will install these when they arrive to see if they help improve tuning.

[HGH 770N]

1000rpm is low it idle nicely.
If you screw mixture screw all the way in dose this stall engine?
If so this jet is working.
I find 12-1300rpm a happy idle on most good units .
The higher the compression the harder it is to set a steady idle at low RPM.
Float hight is important.
Hope this helps.
Best
Roger

[quawk]

Thanks for the advice HGH770N. I would have to go and start the bike again and close the mixture screw to verify whether or not the engine stalls, but I believe when I tried that before the engine would continue to run. If the engine will run with the mixture screw turned in closed, what would this indicate is wrong? I find it curious that you find the engines with higher compression need a higher idle speed. I'm new to these bikes, but in general I would think higher compression would be an indicator of an engine being in better condition, and therefore would be able to idle properly at a lower rpm, whereas you'd need a faster idle to mask the poorer condition of an engine with lower compression. Seems kinda backward. The engine does seem to idle a little "happier" at the 12-1300 rpm level, but I was kinda' proud of myself when I could get it to idle at 1000 rpm. It will settle in and just putt-putt-putt. What is Suzuki's recommended idle speed?

[quawk]

As in my previous post, I have restarted the engine and tried tweaking the idle mixture screw. The engine does run with the idle mixture screw fully in, and in fact idles best that way. Backing it out, even a small amount cause the engine to stumble and stall. Any ideas or suggestions?

[HGH 770N]

Remove float bowl cover .
Primary jet that sits partially outside the cover is NOT vented through to the outside. It’s “Blanked off”
Remove it and check the single hole in the end is clear. Check and replace the sealing rubber that sits over the thread.
Loosen off mixture screw & Remove the mixture screw with the housing ( 2 screws either side)
Blow air line down primary jet hole.
This should clear the gallery to the mixture outlet.
Check float hight and gasket.
Re fit mixture screw, checking the spring and needle is clean and would add some grease to the spring .
Set mixture screw 1 1/2 turns out.
Refit primary jet with rubber.
Refit float bowl cover ensuring the screws are tight .
Fingers crossed.
Roger