Does anyone have a sketch of the spindle mentioned in KTB on page 207 so that the timing can be set without taking the exhaust off or alternatively doe s anyone supply them?
bit of old 1/4" brake rod with a slight kink always sorted me out to 1 degree. ignition timing final adjustment is a rolling road job to get it spot on, if not and you are using a book figure thats good enough.
All you need is a seven inch length of 5\16 threaded rod, two nuts to suit the rod, and two washers. have rod turned down as in know thy beast, and you have a timing tool. Failing that Clever Trever/ Francois Grosset produce a tool not only enables you to time your engine but strobe it at the same time. stumpy lord
Does anyone have a sketch of the spindle mentioned in KTB on page 207 so that the timing can be set without taking the exhaust off or alternatively doe s anyone supply them?
This is one that i made albeit when i had the timing side apart and could marry it up to the timing disc. You will see if blown up a bit that it has 2 marks, one for TDC and the 2nd for 38 degrees BTC for ignition. Certainly takes the hard work out of the job.
Handy? HAndy? HANDY! Its absolutely essential! When combined with a decent timing disk you you can set the timing within +- 1 degree. As to mounting the timing disk - with a hole saw cut yourself a generous circle of 5 ply timber then glue that to the centre of the back of the timing disk with a 1/4 inch hole right thru the centre of both. Then get hold of a bamboo chop stick - not hard or softwood - and poke that thru the hole. Remove the quill from the mainshaft and you will find that the chop stick is a perfect friction fit to hold the disk in position.
And when setting the timing - make sure you are on the compression stroke, its too easy to make the mistake of using the exhaust stroke - I know
Thanks for the replies. Mine is series D ie with distributor, whilst setting the timing, I noticed that the distributor cam has different sized lobes. Anyone know why this is?
Thanks Mac
Hi there Mac, thats because the cam lobes are 205 degrees appart.....First (rear) cylinder fires first then number 2 fires at one full crankshaft rotation plus another 50 degrees being a 50 degree twin.....so 360 plus 50 =410 degrees of crankshaft rotation, but the distributor or magneto spins at half speed, so half of 410 degrees equals 205......Cheers.......Greg.
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