Posted by Allen A. on December 03, 2011 at 19:25:21 from (68.151.99.237):
In Reply to: M has me stumped posted by oldiron29 on December 03, 2011 at 14:56:51:
Is it possible that you have a partially plugged exhaust manifold that is giving you the indication of compression on what is actually the number 1 exhaust stroke. take the second half of the firing order and write it under the first half. the numbers that are above and below each other are running mates, that is to say that those 2 pistons will always be in the exact same position in their cylinders. they will however be on opposite strokes. number 1 will be coming up on compression while it"s running mate, will be coming up on exhaust. number 1 will reach TDC ignition and start down on power as it"s running mate finishes exhaust and starts down on intake. remove the valve cover and watch the rocker activity. when running mate to number 1 is closing its exhaust and opening its intake ( due to valve overlap the intake will start to open before the exhaust finishes closing) number 1 will reach TDC compression. this is the most certain way to verify TDC compression number 1. check that the mag impulse is working and recheck the timing. if she flashes up watch the exhaust. maybe a mouse nest or something will come flying out. this method of verify number 1 TDC compression works on any 4 stroke with even number of cylinders. you just need to know the firing order.
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