classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: triman65 on August 03, 2011, 07:27:43 PM

Title: Engine rotatio
Post by: triman65 on August 03, 2011, 07:27:43 PM

1973 Triumph T120r Boyer ignition

Is the engine rotation clockwise or anticlockwise. I have just changed the points oil seal and the bike shows no sign of firing up. There is a good spark to both plugs and it ran before ok. Anyone any ideas to  what is wrong. Boyer set to clockwise rotation.   

Title: Re: Engine rotatio
Post by: L.A.B. on August 03, 2011, 07:34:41 PM

What you need to know is camshaft rotation (as that is what the Boyer rotor is fixed to) so when viewed from the right hand side of the bike looking at the Boyer pickup the camshaft and Boyer rotor turns clockwise.

Are you sure you didn't re-connect the pickup wires the opposite way around, as that will throw the spark timing way off.

Did you use the correct alternator rotor mark when you re-set the timing? If you used the wrong mark then the sparks will be 180 degrees out. 

Title: Re: Engine rotatio
Post by: JFerg on August 03, 2011, 10:30:49 PM

You would not be the first to have timed it on the exhaust stroke, either.

JFerg

Title: Re: Engine rotatio
Post by: toz on August 04, 2011, 09:50:10 AM

Camshaft goes clockwise as you look from the timing side I believe.

Title: Re: Engine rotatio
Post by: triman65 on August 04, 2011, 04:56:45 PM

Thanks for the replies everyone. Checked the wires to the boyer and they are ok. I had marked the stator before and  it was set for the r/hand cylinder timing mark. Will have to sort out later as i have decided to have the head converted for unleaded. Will let you know  later what was the problem . If it ever gets sorted  :'( :'(