SOHC.co.uk Forums > CB350/400
Timing adjustment at limits
Greg65:
Ok boys and girls advice please.
The timing adjustment on my bike has always been on limits, ie I am now at the point where I can no longer rotate the face plate clockwise any more. Up until now I have set timing by use of multimeter but have splashed out on a strobe unit. This shows me requiring further adjustment, which is not possible. I have stripped, checked the auto advance and reset the contact gap to 0.35. What am I missing or is the cam on part number 196 out of limits? Suggestions please.
Cheers,
Greg
K2-K6:
Take the advance and retard mech off the crank, now spin the motor to see if the spindle is bent at all. If it's out it'll give you timing setup error.
Also the min points gap is 0.3 mm if you set the 1and4 pionts at that it should force you to rotate the whole plate anticlockwise (just trying to visualise that) the gap reduction should retard the timing and cause you to compensate by moving the plate.
Obviously finish by setting the 2and3 points to match.
Greg65:
Thanks, Ive set it to 0.35. Will do as you suggest and check for true. Also would the part of the points that rides the cam wear significantly?
Thanks,
Greg
K2-K6:
If the points heel that rides the cam wears, it's compensated for by adjustments to the points gap and not the timing. So you'd eventually find them not able to open the points far enough to make the gap you want. It wouldn't generally give the problem you are getting.
The gap you set will change the timing though. It's no detriment to set them at the lowest end of spec as it has the effect of increasing the dwell time on the system. This is the amount of time the points are closed and so charging the coils until the spark is required. Some view this dwell as more critical to performance than setting them to an absolute gap.
Greg65:
Thanks K2, quick check of understanding. By lowest end of spec do you mean smallest gap ie 0.30 or the largest at 0.4?
Greg
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