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CB500/550 / CB500 Ignition Timing Puzzle with added YouTube video
« on: March 18, 2017, 12:58:56 PM »
Hi all I have just put the engine back in my bike after a major and excellent overhaul.
The first start up was a bit of a faff, before I pressed the starter I checked for spark and put in new fuel, at first all it would do is spit and fart occasionally. In the end I decided to check the timing and this is where the puzzle is, It is 180 degrees out, which I think is impossible, so I swapped the yellow and blue wires over where they connect near the battery and hey presto it runs perfectly.
I have put a vid on YouTube that shows whats going on; watch it here and sorry about the sound quality:
https://youtu.be/zJ2kpJkyeoM
Back in October when I took the motor out I decided not to disturb the electrics and they all remain as they were. Apart from the electrics behind the left hand side panel where cleaned up the contacts.
Any ideas why the points open and cylinders 1 & 4 spark when the timing marks in the auto advance unit are at the 'F' mark for 2 & 3.
Thanks for looking
Rob
The first start up was a bit of a faff, before I pressed the starter I checked for spark and put in new fuel, at first all it would do is spit and fart occasionally. In the end I decided to check the timing and this is where the puzzle is, It is 180 degrees out, which I think is impossible, so I swapped the yellow and blue wires over where they connect near the battery and hey presto it runs perfectly.
I have put a vid on YouTube that shows whats going on; watch it here and sorry about the sound quality:
https://youtu.be/zJ2kpJkyeoM
Back in October when I took the motor out I decided not to disturb the electrics and they all remain as they were. Apart from the electrics behind the left hand side panel where cleaned up the contacts.
Any ideas why the points open and cylinders 1 & 4 spark when the timing marks in the auto advance unit are at the 'F' mark for 2 & 3.
Thanks for looking
Rob