CB750 Drive Chain Tech Tip
Don’t overtighten your chain if you do you most likely end up with a hole in your crankcase. The slack shown in figure A should be 3/4 – 1 inch spin the rear wheel if it’s tight and then lose your chain and sprockets are worn. Replace the chain and sprockets at the same time. Don’t replace the chain and not do the sprockets.
Gearing:
CB750SOHC-Gearing-Chart-Skeeter
The above chart in Excel is handy to have.
CB750K Gear Calculation | |||||
GEAR | 1 | 2 | 3 | 4 | 5 |
Front Sprocket (Teeth) | 17 | 17 | 17 | 17 | 17 |
Rear Sprocket (Teeth) | 48 | 48 | 48 | 48 | 48 |
Tire Circumference (Inches) | 83.567 | 83.567 | 83.567 | 83.567 | 83.567 |
Primary Drive | 1.708 | 1.708 | 1.708 | 1.708 | 1.708 |
Secondary Drive | 1.167 | 1.167 | 1.167 | 1.167 | 1.167 |
Final Drive | 2.824 | 2.824 | 2.824 | 2.824 | 2.824 |
Internal Gear Ratio | 2.500 | 1.708 | 1.333 | 1.097 | 0.939 |
Overall Gear Ratio | 14.070 | 9.613 | 7.502 | 6.174 | 5.285 |
% Step to higher gear | 32% | 22% | 18% | 14% | |
GEAR | 1 | 2 | 3 | 4 | 5 |
RPM | MPH | MPH | MPH | MPH | MPH |
1,000 | 6 | 8 | 11 | 13 | 15 |
1,500 | 8 | 12 | 16 | 19 | 22 |
2,000 | 11 | 16 | 21 | 26 | 30 |
2,500 | 14 | 21 | 26 | 32 | 37 |
3,000 | 17 | 25 | 32 | 38 | 45 |
3,500 | 20 | 29 | 37 | 45 | 52 |
4,000 | 22 | 33 | 42 | 51 | 60 |
4,500 | 25 | 37 | 47 | 58 | 67 |
5,000 | 28 | 41 | 53 | 64 | 75 |
5,500 | 31 | 45 | 58 | 70 | 82 |
6,000 | 34 | 49 | 63 | 77 | 90 |
6,500 | 37 | 54 | 69 | 83 | 97 |
7,000 | 39 | 58 | 74 | 90 | 105 |
7,500 | 42 | 62 | 79 | 96 | 112 |
8,000 | 45 | 66 | 84 | 103 | 120 |
8,500 | 48 | 70 | 90 | 109 | 127 |
9,000 | 51 | 74 | 95 | 115 | 135 |
9,500 | 53 | 78 | 100 | 122 | 142 |
10,000 | 56 | 82 | 105 | 128 | 150 |
10,500 | 59 | 86 | 111 | 135 | 157 |
11,000 | 62 | 91 | 116 | 141 | 165 |
11,500 | 65 | 95 | 121 | 147 | 172 |