Zenith carb electricky switch thing - what does it do?

MdR · Post by **MdR** » Fri May 09, 2008 1:37 pm

What is this for? On my engine when the throttle is shut the adjustment screw doesn't touch or work it.

Nige · Post by **Nige** » Fri May 09, 2008 1:42 pm

fuel cut off to prevent run-on? Turbo boost? Nitro Injection

MdR · Post by **MdR** » Fri May 09, 2008 1:55 pm

Nige wrote:Turbo boost? Nitro Injection

Plank

Nige · Post by **Nige** » Fri May 09, 2008 2:02 pm

Probably a buzzer that tells you that your neanderthal foot has fell off the throttle pedal. Probably been disconnected, best get it fixed

Gary71 · Post by **Gary71** » Fri May 09, 2008 2:02 pm

MdR wrote:
Nige wrote:Turbo boost? Nitro Injection
Plank

...or maybe this:

MdR · Post by **MdR** » Fri May 09, 2008 2:51 pm

You are the reason I started the topic subject with the word Zenith...

So the fact that the screw doesn't touch it when the throttle is shut is A Bad Thing?
I get a lot of popping and crackling on over run - reckon this is partly to blame?

impmad2000 · Post by **impmad2000** » Fri May 09, 2008 3:07 pm

Chuck it all away. Blank the whole circuit off. See Gary's web page. It was the best thing I ever did to mine.
Chances are that the diaphram's are broken anyway !!
Seems crazy to dump in extra fuel on the overrun !!
(And the speed switch is the same one used for MFI BTW

)
Cheers
Tim

MdR · Post by **MdR** » Fri May 09, 2008 3:11 pm

impmad2000 wrote:(And the speed switch is the same one used for MFI BTW )

Ah. Ha. I feel a for sale ad coming on

To test it is it just closed/open circuit?

Gary71 · Post by **Gary71** » Fri May 09, 2008 3:54 pm

impmad2000 wrote:Chuck it all away. Blank the whole circuit off. See Gary's web page. It was the best thing I ever did to mine.
Chances are that the diaphram's are broken anyway !!
Seems crazy to dump in extra fuel on the overrun !!
(And the speed switch is the same one used for MFI BTW )
Cheers
Tim

What he said

I never wanted the fame... all I did was post some stuff on the web

Now I'm the first hit on Google if you type Zenith 40 TIN in...

impmad2000 · Post by **impmad2000** » Fri May 09, 2008 5:26 pm

MdR wrote:To test it is it just closed/open circuit?

Use a 12V fed sidelight bulb to the "1" connector. Bulb should light above 1500RPM or there abouts.
Cheers
Tim

jamie · Post by **jamie** » Mon May 12, 2008 2:04 am

impmad2000 wrote:Chuck it all away. Blank the whole circuit off. See Gary's web page. It was the best thing I ever did to mine.
Chances are that the diaphram's are broken anyway !!
Seems crazy to dump in extra fuel on the overrun !!
(And the speed switch is the same one used for MFI BTW )
Cheers
Tim

Yep. The diaphragms on mine were fine, but the system is shite, pointless and a terror to adjust. Take it off the car!

Your popping and banging could be a points problem - mine was a rolling soundtrack replica of the Western Front until I fitted electronic points. Was probably the best thing I ever did to the car...

stcos851 · Post by **stcos851** » Wed Jun 03, 2009 11:23 pm

just came across this and looked on the net for the advise from Gary but cannot find it.
Can anyone direct me to it as I have just started to look over the engine and seen that my linkage doesn't touch the switch either although it is running badly at the moment anyway due to the previous owner not running it for 4 years and seeming to adjust everything just to get it started

stcos851 · Post by **stcos851** » Wed Jun 03, 2009 11:38 pm

just came across this and looked on the net for the advise from Gary but cannot find it.
Can anyone direct me to it as I have just started to look over the engine and seen that my linkage doesn't touch the switch either although it is running badly at the moment anyway due to the previous owner not running it for 4 years and seeming to adjust everything just to get it started

jamie · Post by **jamie** » Wed Jun 03, 2009 11:47 pm

Bobbbbb

Watson.

So they say.

impmad2000 · Post by **impmad2000** » Thu Jun 04, 2009 7:07 am

[quote="stcos851"Can anyone direct me to it[/quote]
See link in Gary's signature. Will take you straight there

Tim