TB synch with Carbtune 2?

[Possu]

New to Oilheads, valve clearances spot on & replaced all oils, plugs & filters on my 2000 1150.

Can anyone confirm the following:

I assume that if the TB's need adjusting, you adjust the tickover screw by the cable pulleys on the throttle bodies?

I'm sure I've read that you adjust the right TB only, leaving the left TB alone, to bring it in line with the left TB as the left is fitted with the TPS?

I've read that the brass air screws should both be 1.5 turns out from being screwed fully in? Is this still the case when the bike's fitted with a Y-piece & Remus or just for standard pipes?

If it's an Air Screw & the pilot mixture is weak, I assume that you turn it in by a fraction as it controls air as opposed to screwing it out as you would on a jap carb where the pilot mixture screw normally controls fuel, not air?

Thanks in advance for any replies.

Steve

 

[Steptoe]

the Brass screws are the idle adjusting screw . these are what you use for adjusting the idle speed.

the 1.5 turns you quote are only a guide .

if your not sure what you're doing, you should buy a manual, it explains it all inside, you will recoup your money the 1st time you try to adjust the throttle bodies.

 

[Gas'd Off]

Mr Steptoe

Did you say BUY a manual??

http://www.advrider.com/Wisdom/OilheadMaintenance.pdf

This is spot on for basic back yard mechanics.

 

[MMC]

Steve,

Let me know how you get on - I need to sort out the balance on my 1150 as well as give it a full service this weekend! if it's pretty easy I might be in with a chance of doing it meself!

Cheers

Mark

 

[The Mechanic]

Brass screws......monkeys!

The brass screws that are fitted to the 1150GS are NO mixture control screws, they are purely air bleed screws to enable trimming/balancing of the idle speed and throttle bodies. Youe bike is equiped with fuel injection therefore no mixture control screws are needed as the ECU (brain) which is fed with info via temperature sensors (oil/engine temp) [ambient air temp] {oxygen snsor-Lambda} and speed and position sensors will adjust (within certain parameters) the fuel injection by varying the 'pulse width' (length of time the injectors squirt fuel for) to meet the current fueling requirements of the engine.

Fitting freer flowing exhausts ie removing the catalytic convertor and instaling a 'Y' piece will have an effect upon the system normally weakening the mixture; however you would assume that the ECU would adjust/compensate to meet the new requirements, unfortunately this is not the case as the ECU is limited by its memory or rather the stingy 16bit processor.

As far as the balancing act with the 'brass screws' goes you may find that one will be 2 possibly 2.5 turns out from full in whilst the other may only be 1 turn out. This is due to the difference in (numerous engine components) build quality and design vagaries.

Get someone thats done it (TB balancing etc) before to show you the er, back yard mechanics stuff.....'back yard' I ask you honestly.