SOHC.co.uk Forums > CB750
CB750 K0 Front Sprocket Case Protector
StevieWonder:
Hi Trigger,
Thank you for the description and photos showing the cut away and crankcase mounting point.
The sprocket cover on my bike does not have the cut away. It is as the one on the right in your photo.
I understand that, when the 18-tooth sprocket was introduced the case protector was deleted and a chain guide rubber (that mine has) was also added. It therefore seems logical not to fret over the absence of a case protector.
Your help in reaching this understanding is much appreciated.
Trigger:
--- Quote from: StevieWonder on October 02, 2019, 01:09:17 PM ---Hi Trigger,
Thank you for your knowledge and advice.
Attached are two pictures of the gearbox sprocket cover, on which I can see nothing to mount a sprocket case protector.
I note that my bike (E1036***) has been upgraded with 18-front and 48-tooth rear sprockets, introduced at Engine number 1044805. I also note that it has, as expected, the 'so called' adjustable chain oiler, introduced at E1026144, on the front sprocket. I imagine the sprocket case protector, that was introduced to cover the previous 17-tooth sprocket, may be too small in diameter to cover an 18-tooth?
Whilst trying to make my bike perfectly correct, it seems only sensible to retain the 18/48 tooth set-up and avoid disaster!
--- End quote ---
All early units have the chain oiler, even sandcast units. It is the later units that did not have them so, I am not sure were you get E1026144 from ???
StevieWonder:
Yes they all had a chain oiler, but prior to E1026144 it used a felt plug that could not be adjusted. The latter oiler provided a screw to adjust the amount of oil (screw in to reduce), though of questionable effectiveness. I've got mine screwed right in to see if the chain drys.
Service Bulletin #30 expands.
https://www.dropbox.com/s/xkkwyl5lteti976/CB750%20Service%20Bulletins.pdf?dl=0
Trigger:
--- Quote from: StevieWonder on October 04, 2019, 09:11:54 PM ---Yes they all had a chain oiler, but prior to E1026144 it used a felt plug that could not be adjusted. The latter oiler provided a screw to adjust the amount of oil (screw in to reduce), though of questionable effectiveness. I've got mine screwed right in to see if the chain drys.
Service Bulletin #30 expands.
https://www.dropbox.com/s/xkkwyl5lteti976/CB750%20Service%20Bulletins.pdf?dl=0
--- End quote ---
I know as, I build SOHC's for a living ;) But, the number is wrong as i have found non adjustable screw types up to E103's .
StevieWonder:
I bow to your experience Trig. I'm quoting from the John Wyatt book again.
I note that the oil adjusting screw is quite loose and I'm not convinced it will stay as set, when the front sprocket spins up/down rapidly say for example if an engine was reved hard in neutral. What might I do to hold it in place without locking it?
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