Steve---If you have a good, steady spark from the coil wire to ground, then
things are probably OK from the points to the coil neg. If you can't get spark
to the plug wires, then the rotor is suspect. Or something in the cap area.
The no-start could be timing related, but you should still be seeing spark from
the plug wires. Approx. 12 flashes during five seconds of cranking, per wire.
My best guess for crankshaft rpm when using the starter motor would be around
150 rpm. A lot depends on how much drag is from motor parts, compression, oil
viscosity and the like.
Dick
-----Original Message-----
From: Stephen Lindquist
Sent: Monday, December 15, 2008 12:00 PM
To: 6pack@autox.team.net
Subject: [6pack] Proper starting rpm
What rpm should the engine crankshaft be turning at when the starter is in
good shape and the battery fully charged?
I am trying to diagnose a lack spark to my plugs. I get a nice spark off
the coil if I attach a plug wire to the coil output but not all spark plug
wires seem to be firing at 1/6th of the coil spark rate. And since the
engine wont start I am trying to diagnose the problem from starter
rpm/camshaft rpm and the numbers don't seem to make sense.
68 TR250
Thanks, Steve
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