| Engine # |
|
|
| CB750E-1000001 |
|
K0 |
| CB750E-1000140 |
|
Bolt at the
final drive changed from M8x80 to M10x82 |
| CB750E-1000220 |
|
new lower case,
engine case only available as set |
| CB750E-1000425 |
|
Transmission
changed for better shifting |
| CB750E-1001081 |
|
new crankshaft |
| CB750E-1001760 |
|
7 instead of
8 clutch disks |
| CB750E-1003528 |
|
new final drive
shaft and sprocket |
| CB750E-1005307 |
|
fixed right
bearing of main tranny shaft |
| CB750E-1007220 |
|
new lower case,
deeper oil pan |
| CB750E-1007414 |
|
End of sandcast
engines |
| CB750E-1007415 |
|
introduced circular
opening in lower case |
| CB750E-1009554 |
|
finned oil filter
casing |
| CB750E-1010336 |
|
cam holders
with additional oil passages, new rocker shafts and valve cover |
| CB750E-1014996 |
|
new exhaust
valve guides, new valve guide seals |
| CB750E-1026144 |
|
new cylinder
head, cylinder block: new central M6 bolt, cyl. block w/8 rubbers i/o 12.
Case with guard to prevent damages from broken drive chains. New sprocket
cover, new shift mechanism w/11 parts i/o 7 |
| CB750E-1042806 |
|
weaker clutch
springs |
| CB750E-1044813 |
|
K1 |
| CB750E-1044805 |
|
new case, final
drive 18/48 i/o 16/45 or 17/45, chain oiler |
| CB750E-1044812 |
|
carbs w/links
i/o individual cables |
| CB750E-1044968 |
|
improved neutral
position |
| CB750E-1056080 |
|
new clutch basket |
| CB750E-1064903 |
|
introduced spacial
washerless bolts |
| CB750E-1068376 |
|
cramp for scavenge
hoses |
| CB750E-1071336 |
|
fuel hoses 5.5mm
dia. i/o 5.0mm |
| CB750E-1113723 |
|
grooves in gear
shift rum changed from 0.5mm to 1mm for 4th and 5th gear |
| CB750E-1114461 |
|
new head gasket |
| CB750E-2000001 |
|
K2 |
| CB750E-2061311 |
|
shorter oil
hose w/white mark. Main jets 110, smaller cutouts in air filter case |
| CB750E-2200001 |
|
K3 |
| CB750E-2200001 |
|
new cylinder
head, new valve guide seals, improved oil passages to camshaft, new piston
rings (three part oil scavenge rings), new cam chain guide, larger piston
pin circlips, new final drive shaft, new sprocket cover |
| CB750E-2228679 |
|
new cylinder
head, new valve guides, new valve guide seals, no more rubbers between
fins |
| CB750E-2300001 |
|
K4 |
| CB750E-2304501 |
|
new cylinder
block, smaller cam chain tunnel |
| CB750E-2352923 |
|
new cylinder
block |
| CB750E-2348093 |
|
crankcase mission
cover now has gear indicator |
| CB750E-2372115 |
|
K5 |
| CB750E-2428762 |
|
K6 |
| CB750E-2470427 |
|
clutch almost
indentical to F1: new clutch basket, new clutch cover and chrome cover |
| CB750E-2434657
to CB750E-2439607 |
|
new gear shift
drum, new center shift fork for improved shifting. New gears on countershaft
w/bronce bushings, new case |
| CB750E-2700001 |
|
K7 |
| |
|
carbs w/accelerator
pump, shorter intake rubbers, new final drive shaft, sprocket w/center
bolt, wider chain line (as F2), final drive 15/41, new clutch, new camshaft
(as F1), new pistons (as F), compression ratio 9.2/1. New transmission:
4th gear 1.133 i/o 1.087. Final drive gear 50 teeth i/o 56 (as F1), primary
drive 1.985 i/o 1.708 |
| CB750E-2719530 |
|
new valve guides |
| CB750E-2719997 |
|
new cam carriers
(as F2) |
| CB750E-3000001 |
|
K8 |
| |
|
new intake and
exhaust valves, new valve spring retainers and cotters |
| CB750E-3021913 |
|
new cylinder
block w/larger cam chain tunnel |
| CB750FE-2500004 |
|
F1 |
| |
|
new camshaft,
carbs w/additional idle air. New pistons, compression ratio 9.2/1. New
case w/o primary chain oiler. Final drive gear ratio 43/50 i/o 48/50. 4th
gear on main shaft 31 i/o 30, 5th gear on countershaft 31 i/o 32 |
| CB750E-2600014
and CB750GE-1000014 |
|
F2 |
| |
|
new cylinder
head with bigger valves (34/31mm i/o 32/28mm), larger combustion chamber,
larger carb mount rubbers, stronger cam chain, new camshaft, harder valve
springs, new retainers, cotters, new pistons compression ratio 9/1. New
rod big end bolts and bearings, harder clutch springs, additional fins
on crankcase, larger fins on oil pan, "oil cooler" - finned plate between
oil filter case and engine. Final drive 15/43 or 14/43. |
| CB750E-3100001 |
|
F3 |
