Engine Serial # Model

CB750E-1000001

K0

CB750E-1000140 Bolt at the final drive changed from M8x80 to M10x82CB750E-1000220 New lower case, engine case only available as setCB750E-1000425 Transmission changed for better shiftingCB750E-1001081 New crankshaftCB750E-1001760 7 instead of 8 clutch disksCB750E-1003528 New final drive shaft and sprocketCB750E-1005307 Revised right bearing of main tranny shaftCB750E-1007220 New lower case, deeper oil panCB750E-1007415 Introduction of circular opening in lower caseCB750E-1007500 End of sandcast enginesCB750E-1009554 Finned oil filter casingCB750E-1010336 Additional oil passages, new rocker shafts and valve coverCB750E-1014996 Revised exhaust valve guides & valve guide sealsCB750E-1026144 new cylinder head, cylinder block: new central M6 bolt, cyl.

block w/8 rubbers. Case with guard to prevent damages frombroken drive chains. New sprocket cover, new shift mechanism

CB750E-1042806 Weaker clutch springs

CB750E-1044813

K1

CB750E-1044805 New case, final drive 18/48 i/o 16/45 or 17/45, chain oilerCB750E-1044812 Carburetors linked instead of individual cablesCB750E-1044968 Improved neutral positionCB750E-1056080 New clutch basketCB750E-1064903 Introduction of special washerless boltsCB750E-1068376 Clamp for scavange hosesCB750E-1071336 Fuel hoses 5.5mm dia. instead of 5.0mmCB750E-1113723 Grooves in gear shift drum changed from 0.5mm to 1mm for 4th

and 5th gearCB750E-1114461 New head gasket

CB750E-2000001

K2

CB750E-2061311 Shorter oil hose w/white mark. Main jets 110, smaller cutouts inair filter case

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HONDA CB750 SOHC MODEL CHANGES 1969 - 1978Classic Cycles Technical Resources

CB750E-2200001

K3

CB750E-2200001 New cylinder head, new valve guide seals, improved oil passagesto camshaft, new piston rings (three part oil scavenge rings), newcam 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, nomore rubbers between fins

CB750E-2300001

K4

CB750E-2304501 Smaller cam chain tunnelCB750E-2352923 New cylinder blockCB750E-2348093 Crankcase cover gear indicator

CB750E-2372115

K5

CB750E-2428762

K6

CB750E-2470427 clutch almost identical to F1: new clutch basket, new clutch coverand chrome cover

CB750E-2434657 toCB750E-2439607

New gear shift drum, new center shift fork for improved shifting.New gears on countershaft w/bronze bushings, new case

CB750E-2700001

K7

CB750E-2700001 Carburetors w/accelerator pump, shorter intake rubbers, new finaldrive shaft, sprocket w/center bolt, wider chain line (as F2), finaldrive 15/41, new clutch, new camshaft (as F1), new pistons (asF), compression ratio 9.2/1. New transmission: 4th gear 1.133 i/o1.087. Final drive gear 50 teeth i/o 56 (as F1), primary drive1.985 i/o 1.708

CB750E-2719530 New valve guidesCB750E-2719997 New cam carriers (same as F2)

CB750E-3000001

K8

CB750E-3000001 New intake and exhaust valves, new valve spring retainersCB750E-3021913 New cylinder block w/larger cam chain tunnel

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CB750FE-2500004

F1

CB750FE-2500004 New camshaft, carburetors w/additional idle air. New pistons,compression ratio 9.2/1. New case w/o primary chain oiler. Finaldrive 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 andCB750GE-1000014

F2

CB750E-2600014and CB750GE-1000014

New cylinder head with bigger valves (34/31mm i/o 32/28mm),larger combustion chamber, larger carb mount rubbers, strongercam chain, new camshaft, stronger valve springs, new retainers,cotters, new pistons compression ratio 9/1. New rod bigend boltsand bearings, stronger clutch springs, additional fins oncrankcase, larger fins on oil pan, "oil cooler" - finned platebetween oil filter case and engine. Final drive 15/43 or 14/43.

F3

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CB750 Air Cleaner Case

CB750 Clutch Rebuild Kit

CB750 Complete Engine Gasket Set

CB750 Intake & Exhaust Valve Set K0-K5

CB750 Oil Seal Set K0-K4

CB750 Frame Bolt Set

CB750 Front Fork Rubber Boot Gaiter Set

CB750 Fuel Gas Tank Unpainted

CB750 Fuel Gas Tank Painted Factory Colors

CB750 Fuel Petcock

CB750 Headlight Bucket Case

CB750 Ignition Points Assembly

CB750 Piston

CB750 Piston Ring Set

CB750 Side Cover Left

CB750 Side Cover Right

CB750 Shock Absorber Set

CB750 Period Correct 3.25 x 19 Front Tire

CB750 Period Correct 4.00 x 18 Rear Tire