SOHC.co.uk Forums > CB500/550
Partially Restored 74 CB550
Johnny4428:
Looking and sounding good David. Lovely colour too. In my opinion it is nice for some bike fixtures to show their age. As long as they are presentable.😜
McCabe-Thiele (Ted):
Well done David, all done in around 10 months - looks /sounds good in the video.
I'm on month 17 now tbh I've done nowt since November of any significance - I plan to come out of hibernation sometime around March/April.
Nurse Julie:
Well done, enjoy.
deltarider:
So... the tachometer is from a CB750?
davidcumbria:
Many thanks DR I had no idea. It matches the speedo in size. Looking at the red sectors I agree.
Also I have looked into this now which explains a lot. The 750 tach ratio is 4 to1and the 550 is 6.7 to 1. So on my 550 with a 750 tacho the indicated revs are way too low.
1000 indicated is actually 1667 and 1150rpm tickover would indicate as 690 rpm. This is why I always felt it seemed to revving too fast when setting the tickover using this tacho and why it is happy to tickover well below the 1k mark.
I need to put a mark on the tacho at 5500 which equates to the 9250 red line on a correct 550 tacho. Damn good job you pointed this out or I would have been revving the nuts off it and wondering why it wouldn’t Rev up to the red line.
This really puts my mind at rest because listening the noise my engine makes at indicated 5000 ( only seen revving in neutral - max on the road so far has been very briefly 4000 (6700) ) I was already feeling uncomfortable about how much more it had got to get to the 750 red line at 8000. .This would be actually be 13400 in reality so was never going to happen and could have got messy!
So funny reading all this they love to be revved stuff and this conflicting with my mechanical sympathy about what I was hearing and the Rev counter was showing and now a big sense of relief. We live and learn - especially on this forum👍
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