450 ignition timming

lbm · Aug 20, 2008

Do I use the 5th mark on the crank or the first mark? Also once that is determend on the pointer does that mean that the #1 cylinder is at top and the rotor button arm is pointing to #1 cylinder. Before I can start fine tuning ?

THANKS.

Janicholson · Aug 21, 2008

Static timing (non running) should use the last mark in the direction of rotation. TDC.
It is TDC on compression 50% of the time. 4stroke has the end of exhaust and beginning of intake on TDC as well. Put your thumb in the #1 plug hole and crank/move the engine till it starts to blow air out the hole (compression stroke) If timed on the exhaust stroke it will be 180 off. JimN

450 ignition timming

lbm

Member

Janicholson

Well-known Member

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