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Re: Difficult starting and rough idle

Yes, the plug gap should be .018" for a magneto, not the .025" the plug has from new...A faulty mag will usually start the bike OK but will get weaker and weaker as it gets hotter and often won't generate a spark at all at higher temperatures....
However, on the basis it's much easier to work on the carb than the mag, I'd concentrate on that with Jeremy's comments in mind and also check that everything else in the carb is set up correctly....
Then check the ignition timing...It doesn't take long just to confirm it's correct and then you can forget it...Lastly come to the mag...(bearing in mind you've already checked the points gap and improved the HT connection)...

A low speed misfire is frequently caused by a blocked carb drilling....Ian

email (option): ian@wright52.plus.com

Re: Difficult starting and rough idle

As for the plugs. Well I've had a number of useless NGKs in the last ten years. Used to be my go to plug. Last year we were told to use them in a old DT2 race engine. They lasted twenty minutes, consistantly.... Had to change them every race. Switched to same heat range copper core Champions, the first plug is still in there.

email (option): jeremy@clogmaker.co.uk

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