Pilot air screw question...Advice please.

[LozVTR]

Afternoon all,

Im almost at the stage of refitting my refreshed carbs but ive got a couple of questions:

Im running a full stainless system and am looking to run 118 main jets....

im lead to believe the pilot air screw settings are 2.5 turns out as standard....

Im running a standard airbox and filter so wanted to know if I need to adjust the pilot screws to allow for this? and by how much as a rough guide.

Oh its a NC23 Tri-arm by the way....

cheers all, any advice would be great.

[Waza4]

Go too 2.75 turns on 2 and 3 . Leave 1 and 4 at 2.5 .

Or set them up by ear but that's a bit hard to do.

[scratchin]

sorted it now its bang on this is how you set it if anyones interested
take the bike for a ride to warm it up.
When you get back home or to your shop, let the bike idle till the fan kicks on. We need to know that it is up to running temperature.

Shut the engine off.

One at a time, screw each pilot needle in till it bottoms (gently!). Then unscrew it 1.75 (one and three-quarter) turns. Do this on each carburetor.
This is a ‘known’ lean setting, but the bike will still start and idle.

Start the motorcycle and set the idle to approximately 800 rpm.

With your assistant watching the tachometer, SLOWLY unscrew the pilot screw on #1 carb till the idle starts to climb. Have the other person tell you when the idle starts up. At that point, start counting ¼ turns out. Your assistant is now watching for the tach to DROP a little. Once the rpm starts to drop, just screw the pilot needle back in half way to where it began to rise. You are setting the pilot circuit half way between ‘nearly too lean’ and ‘nearly too rich’.

Reset the idle back down to 800 rpm and repeat the adjustment on carb #2.
Repeat this process till you have adjusted all four carburetors.

Reset the idle speed back to where you normally keep it

Your pilot circuits are now set to optimum.

Take the bike for a ride and if you get popping on deceleration, unscrew each pilot needle an additional 1/8 or ¼ turn (just make sure that the additional amount is the same on all four carbs). Stop there. It’s as close as humanly possible to get it.

You have now set the pilot circuits correctly.

this is how i set mine

[LozVTR]

thats a really helpful write-up scratchin....thanks

Il let you know how I get on with it.

cheers

[firebeast]

just a quicky,but unless the headers are race headers and not just copies you shouldnt need to up the mains at all from where you had them,unless you have a race can and its got standard mains in.i dont know the original size for tri's but gullls are 108 and a full race system will be no more than 4-6 up on that as i had 116 and they were too rich really.if they are 112-114 then go up 2 for a can but i doubt 4 or more will be right.

[LozVTR]

Okay, well I think its a stainless copy of a standard system running a race can on the end.

the standard jets are 112's, I was advised by a couple of people on here to run 118's but il buy some 115's aswell just to be on the safe side.

any advice from people would be grrrrreat......