REAR SPROCKET TEETH NUMBER

[gonebiking-2]

My Honda (82 CB750K ) came out with either a 43 a 44 teeth rear sprocket. I went down four sizes to a 40 tooth rear sprocket in order to reduce RPM at high speed cruising. However the workshop manual says 38 teeth on rear and 15 on front and I know that is definately wrong as I`ve never had a 38 tooth rear sprocket ever. It so long ago since I changed the rear sprocket that I cant remember whether its a 43 or 44 tooth rear sprocket. Therefore my next problem is what O ring chain do I use - a 630/88 or 630/90 ???? Can you guys in the states or UK check the number on the rear sprockets of your 79 - 82 CB750K and let me know what the number is that is stamped on the sprocket. Many thanks

[s2k006]

My '79 750k has 15t/38t sprockets and a 630 90 link chain.
I too am concerned about high rev's at freeway speeds, but I'm
hearing that it's normal. This is my first cb750k.

[gonebiking-2]

This poses a real problem,as I get good fuel consumption with a 15 -40 sprockets set up, but starting on steep hills has always been a problem as I have to really rev the motor and slip the clutch to get underway. Also I have to change down more often, so am thinking that I go back to a 44 rear teeth sprocket and damn the consquences. Now to find the right chain to go with the change in sprocket set up. A 15 -38 setup would be too high a ratio for first gear, but would be OK for long distinace touring , just so long as I didnt have any mountain passes to climb, then I would be forever havomg to swop cogs

[gonebiking-2]

When you say freeway speeds, how fast are you travelling and what is your rev counter reading at the speed you are doing. Let me know and I`ll tell you how it compares to what my Honda is doing at the same speed on a a 15/40 teeth set up.