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CB350/400 / CB400F2 Dynamic Timing Question.
« on: October 01, 2020, 02:09:56 PM »
As I initially set the timing statically I thought I would do a check of it dynamically as it takes quite a bit of cranking from first start when cold to run. Once it has run it starts pretty easily - it could of course just be a fuelling issue or compression related but I'm thinking the timing might be a tad retarded.
I checked Cylinders 1 & 4 first I had to guess the engine RPM as the rev counter is not connected at the moment, on what sounded like around 1200 rpm the F 1.4 mark aligned nicely. When I tried the 2 & 3 moving the connector onto plug 2 the marks were pretty much out of view.
The Dynatek instructions state:- "The engine can also be timed dynamically using a strobe light in the normal manner.
Use the advance marks and an engine speed of about 2500 RPM (full advance)."
When I tried this again guessing the RMP as 2500 - roughly double the engine idle speed. The 1 & 4 marks lined up to the right of the F marks were there are two close together marks.
Am I right that the 2 & 3 timing must be out as it should be showing as per 1 & 4 except showing 2 & 3 marks with the strobe?
Reading my Haynes Manual is more confusing as it talks about "The two advance marks are on either side of the static mark"?
Suggestions are welcome please. Ted
I checked Cylinders 1 & 4 first I had to guess the engine RPM as the rev counter is not connected at the moment, on what sounded like around 1200 rpm the F 1.4 mark aligned nicely. When I tried the 2 & 3 moving the connector onto plug 2 the marks were pretty much out of view.
The Dynatek instructions state:- "The engine can also be timed dynamically using a strobe light in the normal manner.
Use the advance marks and an engine speed of about 2500 RPM (full advance)."
When I tried this again guessing the RMP as 2500 - roughly double the engine idle speed. The 1 & 4 marks lined up to the right of the F marks were there are two close together marks.
Am I right that the 2 & 3 timing must be out as it should be showing as per 1 & 4 except showing 2 & 3 marks with the strobe?
Reading my Haynes Manual is more confusing as it talks about "The two advance marks are on either side of the static mark"?
Suggestions are welcome please. Ted