Hello all, finally got a Norton back in my garage a 1962 99, rideable but due for some TLC. The left pipe is a lot bluer than right was going to check timing as I believe the camring is not always 180 deg apart and that cylinder may be retarded, any errors to be ‘shared’ to avoid stoning of cam ring? Pipes are stainless steel so chrome variations can be ruled out and it is single carb. Tappets are ok too. Bike is easy starter and rides well after I replaced caps, leads and mag pickups. I have noticed the LH plug is fired by the mag output nearest to the cylinder, understand that normal practice is to use the other output? Not sure if this makes any difference? . Only worked on singles before. Any comments appreciated thanks
Pete
Different timing It does…
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Check timing on both sides
It is important to check the timing on both cylinders. It can be wildly out (as I discovered many years ago). If so, stoning the cam ring is the answer. Not too difficult, patience required.
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MODEL 99
hello the 1960s model 99s were not fitted with magnetos they where fitted with the D2 distributor and prs8 lighting and ignition and Rm 15 alternator with emergency start for there ignition and electrical system your model 99 as been fitted with a magneto by the previous owner so therefor a none standard item Yours anna j
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My 1960 99 Slimline is in 99…
My 1960 99 Slimline is in 99.9% original state. The only change is that I have removed the points from the magneto, fitted as standard, and replaced the internals with an electronic ignition gizmo.. Also it never had the PSR8 switch. By the by, the PO's father who originally bought the bike new was a mechanic at a Norton dealers.
I think it all depends on the actual day the bits were assembled and what bits they had in the factory at the time especially if the model and/or company was in a state of 'transition' at the time of manufacture.
John S
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Different timing It does sound possibly the issue, so it's worth checking if they are different. Whatever others say (and I suspect they will say it), don't overcomplicate your life by changing the plug lead protocol! As you have found - it runs fine. It is of course possible that previous owner had the problem and solved it - but didn't polish the pipes. You might try an infrared thermometer - mine came from the sadly missed Maplin, but they are on the web somewhere.