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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
www.ClassicCycles.orgClassic Cycles & Cars
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
www.ClassicCycles.orgClassic Cycles & Cars
www.ClassicCycles.org
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
Classic Cycles Technical Resources
U5FB15E0.book Page 3 Tuesday, May 11, 2004 3:55 AM
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