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Boyer timing and engine starting issues

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Boyer timing and engine starting issues

Posted by aled_corps at August 23. 2017

Hi All,

I've had my 1958 ES2 engine re-built thanks to Mike Pemberton, and over the weekend I put it back in the bike. The bike has a boyer electronic ignition originally fitted by Al Osbourne. I timed it up at 38 degrees before TDC, on the compression stroke. It fired up easily, and after fine tuning with a strobe light it was running great. But, on the first test ride down the street, the engine cut out, and it would not start back up...

I thought I may not have tightened up the distributor locking nut fully and it had moved which upset the timing, so tonight with my father in law Peter Sinnott, we re did the timing, but to no avail as it doesn't sound like it wants to start... not even a cough.

I've checked that the battery is charged fully, and there's a strong spark. I've stripped down the carb to ensure the jet is not blocked in any way, and that fuel is getting to the carb ok.

So I've got fuel, spark, compression, and the timing is set, what am I missing? or what else could have gone wrong? I'm at a loss as to what to check next.

Can I also double check with those familiar with a boyer ignition that it should be set up so that at 38 degreees before TDC I can see the small screw on the metal plate through the timing hole before the coil?

Thanks

Aled

Re: Boyer timing and engine starting issues

Posted by christopher_winsby at August 24. 2017

Try another spark plug. Only get spark plugs from known good source's.

You can also get in line spark indicators you put in line to the plug. They can spark OK out but break down under pressure.

I also had a Boyer black box with an intermittent fault.

Re: Boyer timing and engine starting issues

Posted by john_holmes at August 24. 2017

The 2 trigger wires on the Boyer stator plate can break down internally and give intermittant sparks. Test is to wiggle them with a multi meter on ohms and see if it varies, cure is new wires and a better way to brace them to the plate.

Re: Boyer timing and engine starting issues

Posted by aled_corps at August 24. 2017

Thanks, I have a champion spark plug, but I will try another. I'll try and get my head around my multimeter (electrics are not a strength of mine) to check the boyer wires. It was put together by Al Osborne, who certainlt knows what he's doing, and the wires seem to be braced very well to the plate.

Re: Boyer timing and engine starting issues

Posted by aled_corps at August 25. 2017

Just to close this off. =the problem was a failed spark plug, once that was replaced, it started straight away.

 

Thanks once again to Alan Osborn for his assistance in testing the boyer. Much appreciated.

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