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Francis barnett no spark

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Francis barnett no spark

Post  Martinrhyl on Sat Oct 15, 2016 4:11 pm

Hi I have a 1958 Francis barnett light cruiser 79 amc,,I've rebuilt the bike ect put the kick start on and have to spark from plug when I ground it to engine.i have has a multi meter on the wire heading to the coil and whem I kick start the engine there's a reading of 0.56 v comes up but no spark from plug thanks anywhere would be appreciated.

Martinrhyl

Posts : 25
Join date : 2016-04-21

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Re: Francis barnett no spark

Post  Druid on Sun Oct 16, 2016 11:46 pm

Hi Martin

Check that you have a circuit between the output wire from the engine through the Ht coil primary and back to earth through the contact breaker in points closed condition. The circuit should be broken when the points are opened. I would expect the loop resistance to be less than 20 ohms. If you want to check if you have an output from the engine ac generator measure the ac current from the generator to earth, this should be above 100 - 200 mA at "kick start" speed. (An analogue ammeter is likely to be better in this situation than a digital multimeter)
Hope this helps
Dave

Druid

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Spark

Post  kerabo on Mon Oct 17, 2016 2:06 pm


Or
Check you have battery voltage at the live side of the coil. If you then stroke a wire from the CB side of the coil to earth you should see a spark at the plug.

Regards Ken

kerabo

Posts : 1796
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Age : 66
Location : 1950 Powerbike 56. 1960 Falcon 87. 1961 Trials 83 Special. Falcon 87 in bits. Falcon 81 Trials bitsa.

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