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CB750 K3 - lack of power

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Nurse Julie:

--- Quote from: garyjpaterson on August 12, 2023, 10:57:10 AM ---Checked resistance on the caps - i'm getting about 12-13k ohm on the two outer caps, and just under 9k ohm on the middle ones. They should all be roughly the same, no? Not different by that much.
And I'm using DR8ES plugs atm - should i be looking into non R plugs?

--- End quote ---
Yes, change plugs to D8EA or Denso equivalent X24ESU

Trigger:

--- Quote from: garyjpaterson on August 12, 2023, 10:57:10 AM ---Checked resistance on the caps - i'm getting about 12-13k ohm on the two outer caps, and just under 9k ohm on the middle ones. They should all be roughly the same, no? Not different by that much.
And I'm using DR8ES plugs atm - should i be looking into non R plugs?

--- End quote ---

Too many ohms. I think Ash advised me on 5 ohm  ;)

Bryanj:
Yes the caps should be the same and you should not have resistor plugs with resistor caps

Oddjob:
NGK caps are normally 5K ohms resistance, those are either buggered or poor copies.

garyjpaterson:
Plugs and caps are here, waiting for new clamps for the intake boots still as the old ones were very stretched, so hopefully that'll stop any leaks.
In the meantime, I did what I probably should've done ages ago - a compression test!

Would've liked a little more uniformity, but I think its just about acceptable. Engine wasn't properly hot, just slightly warm. I checked valve clearances before, they were just fine.

cyl 1: 130psi
cyl 2: 145psi
cyl 3: 145psi
cyl 4: 150psi

I'll certainly keep an eye on cylinder 1, and check in future once some miles are on it. Hoping that the rings are a little stuck or something

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