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No spark 850 mk3
#775382 06/01/19 4:56 pm
Joined: Feb 2019
Posts: 11
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Hi, my 850 mk3 estart hasn't run for a while, it now has no spark when kicked or starter motor,it has got power to the points & coils if you open close points with driver it sparks?? Do I have maybe earth problem as no pulsing when turning over just continues feed thanks andy

Last edited by Andy davies; 06/01/19 5:08 pm.
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Re: No spark 850 mk3
Andy davies #775408 06/01/19 11:47 pm
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If it still has the points for the ignition (?), have you checked the gaps of the points as the points cam rotates.
If it sparks when you open the points with a screwdriver, there should be no reason it can't spark when the points cam opens the points ??

First sign of no spark, its nearly mandatory you try a set of NEW spark plugs.
Amazing how many maladies this can fix.
Once its running, try the old set - and put the newies back in the box for next time, or next tune up time...

Re: No spark 850 mk3
Rohan #775424 06/02/19 7:24 am
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Whats up andy ?
2 months ago this bike had a Boyer .
Have you rewired it with points ignition ?... and it has not started yet ?

Re: No spark 850 mk3
quinten #775430 06/02/19 8:53 am
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Hi no that was a trident, and the problem was the buyer box it's now good,this bike is a Norton 850 mk3 cheers andy

Re: No spark 850 mk3
Andy davies #775445 06/02/19 3:53 pm
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12v at coil?? points plate grounded ,? condenser?

Re: No spark 850 mk3
bodine031 #775460 06/02/19 7:46 pm
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A... Bike has stock wiring?
B... [edit] 12 volt negative positive ground .
C. .. 2 - 6volt coils
D...1 ballast resistor .
E...1 e-start/ solenoid
F....1 charged battery ... able to hold a load .

1. Locate the ballast resistor ( part 30 )
On your bike .
With key and kill on ,
Whats the voltage before (key side) and after (coil side) the ballast ?

2. What is the battery voltage ?

3 whats the battery voltage after a 5 sec E-start attempt ?

4. ( bonus question ) what's the voltage on the coil side of the ballast
During an e-start attempt ?
.[Linked Image]

Last edited by quinten; 06/02/19 9:00 pm.
Re: No spark 850 mk3
quinten #775462 06/02/19 8:10 pm
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Originally Posted by quinten
B... 12 volt negitive ground .


Standard would be positive earth/ground.

Re: No spark 850 mk3
L.A.B. #775463 06/02/19 8:16 pm
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Originally Posted by L.A.B.
Originally Posted by quinten
B... 12 volt negitive ground .


Standard would be positive earth/ground.


Lol , yes you are correct...
I wish I could say I was asking a trick question... but the jokes on me ... i will edit .



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