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M500 #739788 22/04/22 01:26 PM
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Is the dizzy tight? .... if it slipped round for whatever reason it would still have everything it needed to work ... just not in the right places .... good luck.


K

M500 #739793 22/04/22 02:30 PM
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Is the carb opening properly to let air through? Could the cable or mechanism have broken somehow.?


JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
M500 #739796 22/04/22 02:41 PM
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L
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Perhaps suspect fuel...?

OK so it does not even run on easy start.... perhaps the plugs were soaked before the last attempt with easy start which may explain that phenomena.. If you dry the plugs then squirt the easy start, that might cancel out that line of thought..?

M500 #739799 22/04/22 02:50 PM
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I know you said there is apparently a good current in the lead above the plugs but are the plugs themselves sparking, i.e. the engine has a solid ground?

Last edited by britmog; 22/04/22 02:51 PM.

Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
M500 #739802 22/04/22 03:16 PM
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Just Getting Started
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Just Getting Started
M
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Thanks for the responses
* the distributor is tight
* both throttle and choke cables free and working
* extra earth lead fitted between block and battery
Even with the plugs heated to red hot (blow lamp) and Easystart it won’t even fire, the plugs are fine

The fact that it won’t fire and there is fuel and a spark suggests timing but I have checked this more than a dozen times and all is fine


Mark

1979 4/4 crossflow twin 40’s
M500 #739804 22/04/22 03:25 PM
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Is the cam going round?

Is the dizzy cap back on in the right place?

Did you remove the plug wires and reverse their placings on return?

K

M500 #739806 22/04/22 03:44 PM
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I understand the cables move but does the throttle body / butterfly. The linkage can fail.
Or is there some thing blocking the air inlet / filter?


JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
M500 #739807 22/04/22 03:56 PM
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No, the butterfly’s are fine both the throttle and choke work fine
the rotor arm turns with the engine, I can only assume some form of negative magic is at large - it makes as much sense I am not the greatest mechanic but I did my time in the 1970’s and have never had this much of a problem, now four days, and nothing!


Mark

1979 4/4 crossflow twin 40’s
M500 #739808 22/04/22 04:15 PM
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It is strange!

To confirm - you have a good spark at each plug and plugs are getting wet when you're cranking the engine over. That would suggest fuelling and ignition is OK.

It would suggest a timing issue? Can you get a rough idea of timing using the crank pulley timing marks? Static timing should give it enough to get it to start.

I wonder if it might be a problem with the dizzy shaft? Maybe the worm drive has sheared a tooth and she's skipped a few degrees.


1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10
M500 #739809 22/04/22 04:19 PM
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Seeing as how we have thus far thrown everything but the kitchen sink at the problem,.... grin2
I'll add my Canadian nickel...

Does your car have a ballast resistor wired into the start circuitry? if so, verify that it is functional.
The condenser is also a viable suspect /culprit. thinking
I share your frustration, Good luck! thumbs



Bert & B1800
"Tis well enough to know how much to know; and when to know, not to know, too much."
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