Greetings All.

I've always been a bit sus on the timing on my 850. Just cleaned it up for the Rock n Roll rondy at Birdwood tomorow. Checked plugs. Perfect.
I've noticed the rotor button is firing (leaving marks) on the last 1/8th of the contact. The arrow says it turns anti clockwise, so it fires on the last bit as it passes through.

Am I right thinking I should advance it a couple degrees? So it fires more to the middle of the rotor contact thingo.


As I drive along, it runs great, When I push the loud pedal it starts to "dry reach" as if it's not getting good spark.

Cheers
Alex.

Advancing it will make no difference. But changing the points gap, or the vacuum advance working, will move the spot.

Perhaps the vacuum can has a hole in it...
Vac advance dizzys usually have a longer curved bit on the rotor, this is why.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Doc.

I'll check the can and line.


cheers
Alex

If the rotor is marking up at one point (not ever seen that myself) does it not mean that the timing is not changing??? Because they fixed together mechanically, the same point on the rotor passes the cap contact at the same time that the piston reaches a particular point in its travel....

Ie if it always fires at teh same point, there's no centrifugal advance???

Cheers, Ian

No it doesn't move with centrifugal advance, because the rotor is attached to the cam- as that gets advanced by the bobweights, so does the rotor.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.