Carbie set up - air screw.

[tripodtiger]

tinker time, gotta love it,, how far is right down,, meaning did you pull the slides and the needles out, and if so you might have put the clips in the wrong groove,,

there are 5, the centre is taken as neutral, so going up from centre will drop the needle which will lean it out,, so going down will lift and richen,

 I've found the mixture screws really only work on idle,, so running at speed and having black plugs will mean needle adjustments,------------------OR--------------and float height checks

'right down' was a complete dis-assemble.  The carbs were separated and every part that could be pulled out was.
It would appear that the error I made was with the mixture screws.  Maybe I'm dislexic?  Can read 1 1/4, but interpret as 1 1/2!!

The reason why I suspected idle mixture was that it stuffed up in a 'parade', riding at idle to 1800rpm.  Until the plugs started to foul, it was sweet at 50-80km/h. 

15 minute job, mainly taken up taking the seat & tank off etc, discovered that the screws were all nicely at 1.5 turns out.  Re-set them to 1.25 and it is now running nicely.  Settings are in the ball park now (why do I need to use an Americanism?  What's teh equivalent Aussie expression?), not perfect, that will require someone with more skills than I, but enough to ride it and enjoy the ride.

I finally got to join in on our monthly club ride on Sunday.  It's only short in deference to some who ride mid 50's bikes, but it was nice rolling through the gearbox/rev range up to a 100 cruise.

Next is the clutch.  I'm fairly certain it's not supposed to spin like that
But that will have to wait until the sidecar suspension is done, and the KTM is re-registered, etc.

And drop the forks down the triple clamps a bit.  I'm unused to the ponderous steering.

[steptoe]

tinker time, gotta love it,, how far is right down,, meaning did you pull the slides and the needles out, and if so you might have put the clips in the wrong groove,,

there are 5, the centre is taken as neutral, so going up from centre will drop the needle which will lean it out,, so going down will lift and richen,

 I've found the mixture screws really only work on idle,, so running at speed and having black plugs will mean needle adjustments,------------------OR--------------and float height checks

[petejw1966]

hi ray,
the mixture screws adjust the amount of fuel,
so screwing them out will be richer and screwing them in
will lean them out.

if u have the early model carbs be careful screwing the mixtures
screws in, if there screwed in to tight the tips of the screws break
and are a pain to get the broken tip out.

[Jonesy]

Ray,
The literature I've seen says 1 & 1/4 turns out...........experiment time.

Jonesy.

[tripodtiger]

I've belatedly gotten around to putting my old xs back on the road. 

I pulled the carbs totally down and cleaned the crap out of them.  Now, it appears to be extremely rich at low speeds / idle.
Yes, I pulled out what I call the air screws - top of the carb body - and set them back in at what I had as the correct turn out (1.5 without looking back at my manual).  First time out it ran for a few km and then started to miss.
I pulled out the plugs and they were all black as!  Put new plugs in an it ran fine.  But I didn't push fate for too long, got it back in the garage before it loaded up again.

Question is, to adjust the air screw, which way makes it richer and which way leaner?
My first assumption is that backing them out will make it leaner.  Yep, little bit at a time.