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197 timing

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197 timing

Post  Darren_504 on Sun Jan 19, 2014 11:28 pm

Hi there getting a little confused bout the timing haven't had this bike running yet can any 1 help set it so the mark on the magneto lines up tdc no luck tryed other ways getting tired of it so prob over looking something any help would be really appreciated (bike has stood for a number of years got spark clean fuel and new points and condenser)

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Re: 197 timing

Post  Jack Clegg on Mon Jan 20, 2014 12:17 am

The arrow mark on the mag does not always marry up. I fell on that one last year.
Mag was off another motor.

I measured 11/64ths down the bore with a rule, fag paper in points, should just be letting slip the paper at 11/64ths btdc
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Re: 197 timing

Post  Darren_504 on Mon Jan 20, 2014 12:21 am

Points opening btdc?

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Re: 197 timing

Post  Kim on Mon Jan 20, 2014 2:39 am



This may help. It's from the Instruction booklet. The setting you need is the one for the Falcon.
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before top dead centre

Post  piston 197 on Mon Jan 20, 2014 7:51 am

YES , the points must open before top dead centre by the manufacturers specification, Darren you are confusing this info with aligning the timing marks, which when you have an original factory set ignition is marked with the piston at TDC, but the points will still be opening at the required amount BTDC, The factory set the point at the correct gap, set the flywheel to open them at the required distance BTDC, then moved the piston to TDC before marking the flywheel, the confusion arises when the flywheel fitted to the bike is not the original one ,then the timing marks may be somewhere near, but are likely to be wrong.
JH
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Re: 197 timing

Post  Darren_504 on Mon Jan 20, 2014 7:58 am

Thanks for every ones help going to try tonight so the fly wheel is made per engine ? All could be different ?

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different

Post  piston 197 on Mon Jan 20, 2014 8:07 am

YES, there will be tolerance with regard to fitting the cam in the centre of the flywheel, and the magnetic flux point, basically set the points at 12 to 15 thou fully open, put a .001 thou feeler between the points when closed, set the piston at the required distance from it's highest point on the up stroke (BTDC), turn the flywheel clockwise without moving the piston position, until the points just release the feeler, without altering the piston position, tap the flywheel onto the taper and tighten the centre nut as hard as you can,( Villiers used a spanner with a lump on the end that you hit with a mallet called a "hammertite" spanner), Check nothing has moved and points are opening at the required position.
JH
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Re: 197 timing

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