Author Topic: Static timing cb350f  (Read 439 times)

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Offline knutsi

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Static timing cb350f
« on: April 12, 2021, 06:56:32 AM »
I am trying to set the static timing with a circuit tester. Problem is that the light stays on regardless of any position of the base plate. It should only light up when timing is correct?. The bike starts and run ok on idle, but does not rev. up in gear.  Thanks for any suggestions.

Offline Deltarider

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Re: Static timing cb350f
« Reply #1 on: April 12, 2021, 07:24:51 AM »
Welcome, Knut. Seen your name, I suppose Norwau is Norway.
The test light should come on when the 'F' mark on the advancer aligns with the mark in the crankcase. This is when the breakerpoint begins to open.
The secret is that, under normal circumstances, you do not have to move the plates at all. This is because practically all "off" timing originates at the breakerpoints.
Three causes:
1) The breakerpoints' little fiber 'heels', that follow the cam, are worn (lack of lubrication of the cam).
2) The points surfaces are worn
3) You have fitted new breakerpoints
In all three cases and under normal circumstances, you can regain a correct timing by simply adjusting the breakerpoints gap, although this gap has to be within 0,3 and 0,4 mm at its widest opening* .
If after setting the correct gap a correct timing still cannot be achieved by adjusting the plate(s), either your breakerpoints are severely worn or you have fitted aftermarket breakerpoints.
But... now that you have moved the plates already, I'm afraid you have to do the full procedure:
Start with the breakerpoints gap (as said the gap has to be within 0,3 and 0,4 mm at its widest opening*) and then set the plate(s). In that order.
*Let's take breakerpoint 1+4. To get to the widest gap opening of that breakerpoint, you need to turn the crank a 90o further. If you look through the peep hole, you will see more or less what's shown in the pic below. In the pic it is about a CB500, but the 350 is pretty similar.
Knut, what manual do you have?
« Last Edit: April 12, 2021, 08:19:35 AM by Deltarider »
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Offline knutsi

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Re: Static timing cb350f
« Reply #2 on: April 12, 2021, 10:14:58 AM »
Deltarider, many thanks for your answer :). I have a new set of points and condensors. Have just been in the garage to doublecheck the point gaps. The points have the correct setting.  I think I will borrow a strobe light and see if I can set the timing correct,

Offline Deltarider

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Re: Static timing cb350f
« Reply #3 on: April 12, 2021, 12:11:10 PM »
Know that the correct working order is:
Set the correct breakerpoints 1+4 gap.
Check and only adjust when needed (!) the timing by rotating the base plate.
Set the correct breakerpoints 2+3 gap.
Check and only adjust when needed (!) the timing of 2+3 by rotating the secundary plate.
Note. It is easy to understand, that Honda dealer mechanics back then usually set the timing by just positioning the (new) breakerpoints. They were confident that both the base as well as the secundary plate had stayed firmly fixed by their screws and that those plates normally did not need readjusting. Hence they could limit their attention to just the breakerpoints.
Most CB350F documents are here: http://manuals.sohc4.net/cb350/
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