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Series 1 misfire

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Series 1 misfire

Postby Charliescooter » Sat Sep 18, 2021 12:09 pm

Having sorted the gear cables out and all gears selecting i thought i would have a ride round on some private land. All seemed well until i decided to 'open it up' and found it is misfiring in all gears. Now let me point out it has new fuel filter, new air filter, new plug and ht lead, tank has been cleaned and beand new fuel in, carb has also been stripped and cleaned. Does anyone know reason for misfire, like how to set up the carb or air/fuel mixture? It is a series 1 and is a total srandard 125 at present. Look forward to some replies in regard?
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Re: Series 1 misfire

Postby MickYork » Sat Sep 18, 2021 3:50 pm

Could be electrical, what ignition system do you have ?
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Re: Series 1 misfire

Postby Bren » Sat Sep 18, 2021 4:34 pm

More likely to be CDI/Coil or timing
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Re: Series 1 misfire

Postby Charliescooter » Sun Sep 19, 2021 10:08 pm

Its a total standard 6v ignition set up
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Re: Series 1 misfire

Postby hullygully » Mon Sep 20, 2021 4:38 pm

have you cleaned the points faces?
checked your timing with the mag flange markings?
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Re: Series 1 misfire

Postby Herbert » Tue Sep 28, 2021 1:30 pm

I experimented with the 6V ignition timing on mine and from 22 to 18 (+/- 1 degree) BTDC, and found below 20 degrees, misfiring occurred. Try and aim for 21 degrees BTDC if you can to see if normality returns.
Good luck
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Re: Series 1 misfire

Postby hullygully » Wed Sep 29, 2021 1:45 pm

shouldn't he be aiming for 23 deg BTDC as the std GP's are 21 deg :shock:
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Re: Series 1 misfire

Postby ULC Soulagent » Wed Sep 29, 2021 6:16 pm

Wouldn’t be an inline fuel filter your using?
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Re: Series 1 misfire

Postby missing lynx » Thu Sep 30, 2021 3:33 pm

You may get more response if you put it on the right page on the forum, series 1,2,3
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