Author Topic: How can I test/set dwell on CB750K?  (Read 1243 times)

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Offline PeWe

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Re: How can I test/set dwell on CB750K?
« Reply #25 on: September 14, 2023, 03:15:49 AM »
My multimeter dwell function does not use inductive clamp. It is a clamp in the package but not for dwell.

Just connect to point and case as measuring voltage.

Dwell to get the little extra when both points are equal  when moving and adjusted on a warm engine.

Both my bikes have Dyna-S nowadays.
Too much fiddling with points.
My K6 showed strange power curves on dyno at higher revs. Frequent rebuilds, cam changes etc needed to take the plate off.
Chevy points might have been an upgrade.

Dyna-S  back where it sat before tear down. Marked with a marker pen.
I had a degree wheel on ignition side when timing the cam.
Quick check with a timing lamp to just see its OK.

My K2 got a point failure causing misfirings that made me to use Dyna-S on that too.
Might have been abused by me when wrenching, TEC points and plate.

Who knows, maybe points will return. That ignition is a part of the old CB design ;)
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline TwoTired

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Re: How can I test/set dwell on CB750K?
« Reply #26 on: September 14, 2023, 09:49:53 AM »
I would like it explained how to measure charge time of the coil from an inductive clamp on the spark leads, as some have suggested.  What specific tool does this?
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline RAFster122s

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Re: How can I test/set dwell on CB750K?
« Reply #27 on: September 14, 2023, 05:34:37 PM »
If an EMP happens nearby your points Honda might be one of only few vehicles running. But if an EMP happens nearby, it will probably be one of your least worries...
David- back in the desert SW!