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CB750 K3 - lack of power

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garyjpaterson:
Yeah throttle was wide open. I checked them in reverse order, so 4 first and 1 last, so the battery wasn't able to spin it quite as fast by the end, so that probably has a small effect

Martin6:
Was the airbox still on?

garyjpaterson:
I took the lower half and filter out, left the top half on.
But as I said, i'm not overly concerned with the overall numbers, it seems quite normal to be down on brand new compression after 50 years.
Its just one cylinder being a bit down on the other that i something i'll need to keep an eye on.

Trigger:

--- Quote from: garyjpaterson on August 16, 2023, 08:40:05 AM ---I took the lower half and filter out, left the top half on.
But as I said, i'm not overly concerned with the overall numbers, it seems quite normal to be down on brand new compression after 50 years.
Its just one cylinder being a bit down on the other that i something i'll need to keep an eye on.

--- End quote ---

That is the correct way to do it, no air filter fitted.  ;)

garyjpaterson:
the new plugs and caps seemed to make a huge difference, power seems to be much closer to what I would expect. Really chuffed with that!

Now i need to focus on getting the idle mix sorted. Its a bit slow to return to idle, so I checked the plugs and 1 to 3 look potentially a little lean, 4 is very fouled though. All were just 1 turn out

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