Please help...

[sparkywig]

I've had a bit of a weekend, I've changed my old 34 ICT's with blocked emulsion tubes for a pair of new ones and now the bus won't run.
I set both carbs up to an 0.008 gap between the butterfly and carb wall, 11/2 turns on the idle screws, and 21/2 turns on the mixture screws and bolted them on. Connected everything back up and set the linkage up so they're both synchronized.
Won't start!
Kept adjusting the throttle stop screws until it finally started, about 31/2 - 4 turns out.
Tried adjusting the mixture but it won't idle unless the mixture screws are turned right in. Now it won't respond to the throttle without popping and banging.
Both carbs are jetted exactly as the old ones, but can't get the bugger to run, let alone pull off the drive.....

Any suggestions?

 

[Frankie]

is this any good to you hope it helps Frankie http://webernorthamerica.com/pdffiles/webertroubleshootingguide.pdf" onclick="window.open(this.href);return false;.

 

[Slammed]

Air leak on the manifolds/carbs?

 

[Frankie]

whs i had an air leak on mine.

 

[matt-me]

Is there enough fuel getting to the carbs? I have ICT's and had a similar problem. The fault was an air lock not allowing fuel getting through to the carbs, maybe you have a lesser air lock than mine so you're getting some fuel through. I took off the fuel pipe form the pump and tried to blow through it. Initially i couldn't. After stronger blowing, i could hear air coming out of one carb, then eventually the other. I think petrol was sitting in the pipe behind the fan housing, before an air lock not allowing it to get to the carbs. Once i could hear air coming through both carbs. Connected it all back up, fired up first time. I then went about adjusting.

Just my thoughts and experience. Good luck.

Al

 

[sparkywig]

Apparently it's too much fuel. The Webers can only handle up to 3 - 3.5 psi, while the stock fuel pump pushes out anything between 5 - 8 psi.

 

[sparkywig]

:evil:

I really do need some help now. Spent all day f*cking about.
I fitted the fuel pressure regulator, taken the carbs back off the engine stripped and cleaned them, reset the throttle butterflies to 0.008, and mixture screws 2 1/2 turns out.
Refitted them, connected everything back up, and still the f*cking thing won't start!!!!
Well it starts, runs like a c*nt on 2 1/2 cylinders, and then cuts out after 10 seconds or so. The battery's now flat, my neighbours are p*ssed off and I've had a gutsfull.

Any suggestions?
Anybody with 34 ICT's fitted to a 1600 single port engine? What setup have you got? Are you running a pressure regulator? What jetting is fitted?

 

[creationblue]

Wig i feel your pain :msn4:

Sounds like you have done all the right things there, worth checking the inlet mans are seated on the heads, as the tinwear can foul the seats, i was sure mine wasnt gonna fit but got away with it. Maybe worth trying another fuel pump ect ect

Just

 

[sparkywig]

:suicide:



















































:lol:

 

[creationblue]

Did you get her purring.....? bus not the wife

Just

 

[sparkywig]

Not quite. :lol:

Got it started though, idles OK, but won't take any throttle.
Going to go through everything tomorrow, starting with the valve clearances.

 

[K@rlos]

If it's too much fuel, it will be flooding itself and wetting the plugs. Are the floats set correctly? I feel your pain mate, the 40 IDF's i've got on mine are giving me a hard time atm. 1 has sprung a fuel leak :evil: ordered 2 rebuild kits to play it safe......£57.95 with postage and vat from eurocarb! :shock:

But we both know it's worth the hassle when you get them right

 

[creationblue]

Not quite. :lol:

Got it started though, idles OK, but won't take any throttle.
Going to go through everything tomorrow, starting with the valve clearances.

Well worth starting with the valves, moving onto the timing, sounds like air leak tho as it wont take any throttle :? Best of luck bud
Just

 

[sparkywig]

The good news is that I can change a pair of carbs and set up the linkage in less than 5 minutes now.

 

[creationblue]

The good news is that I can change a pair of carbs and set up the linkage in less than 5 minutes now.

Results :lol:

 

[Slammed]

A rotary pump might help, delivers 3-3.5 psi, had one running my twin 40s and it was spot on.

 

[sparkywig]

I've got an adjustable pressure regulator fitted and set to 3.5psi.
Reset the valve clearances this evening, nos 1 & 2 were really tight, found that the rocker cover on 3 & 4 had no gasket fitted.
Going to whip the carbs off yet again tomorrow and give them a good clean through, reset them and try again.

 

[creationblue]

Maybe a blessing in disguise then 8)

Just

 

[67panel]

sounds like accelerator pump(s) not working,check by working throttle and see if fuel squirts in :roll:

 

[sparkywig]

sounds like accelerator pump(s) not working,check by working throttle and see if fuel squirts in :roll:

No, they work fine.