SOHC.co.uk Forums > The Black Bomber Board
Timing problems on the 450 Bomber
mo goldie:
here is a two pictures I took today the one if you look at the pick up`s can you see the dot on the end of the cam, Then look at the other picture that is where the timing marks are .......... and the pinkish mark`s is where the TDC is after using a Dial gauge to find that out......... but where ever you turn it the plugs don`t spark.
Yes it is the standard Auto Advance used and i stripped that just like they say cleaned it and use white Grease to lube too.
royhall:
The one I fitted was my second system. The first was a Pamco unit that I spent an entire day fitting including making a special wire sub harness for. That sod didn't work at all so I understand how your feeling. To add to the pain the company ceased trading at the same time so no help or refund. That went in the bin and I bit the bullet and bought the Charlie's Place system.
Are you sure your electrical system on the bike is up to scratch as these systems are really sensitive to fluctuations in voltage. The standard bomber doesn't even have a regulator fitted and a 55 year old selenium rectifier and single phase alternator. This is why Common Motors insist that you fit their combined reg/rec. Sorry to say but this is beginning to look like another faulty electrical system, and not the ignition unit. Probably best contacting the supplier again for advice. I fitted a regulator from a later model and a modern solid state rectifier, along with a new Motobatt AGM battery, and a new wiring harness. I also have a NOS alternator rotor fitted as old ones can loose magnetism and directly affect charging. In other words I went through the entire system to get things to work correctly.
When your trying for a spark are you using the electric starter or the kickstart. The reason I asked about the battery being fully charged is that the system won't work correctly if the voltage drops. Using the electric starter will possibly drop the charge too low for the system to fire the coils?
I think we're all scrambling for ideas as trouble shooting electrical problems from afar is difficult.
royhall:
--- Quote from: K2-K6 on November 27, 2023, 10:37:43 PM ---Guessing at "Hall effect" from proximity of ferrous presence of cam peak.
Interestingly they can only be fitted in one direction (there's an arrow on the face, facing the cam lobe) and he says they won't work backwards.
--- End quote ---
Hall effect isn't going to work that well without magnets fitted surely. Just triggering off the proximity of the cam lobe is a bit hit and miss isn't it.
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K2-K6:
They only need a small shift to work I think with newer components, rather than a bigger spike we've seen before and usually with magnets in plastic rotor.
They do seem to be switching though, evidenced by the led flip flopping, so signal is there to be amplified and trip the solid state earth modulation.
Maybe check the circuit to earth (on the coil earth routes out of the boxes) to see if that is switching, then meaning there's problem on coil side of system.
royhall:
I would say there's a reason beyond salesmanship why they insist you fit a new rec/reg or you don't get a warranty. Maybe there's enough voltage from the old bike system to light the led's but not enough to operate the system. It looks correctly fitted but it still ain't working. We don't know anything about the state of the bikes battery or system.
Mo. Any chance of a couple of photos under the seat.
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