Engine Serial # Model 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 Revised right bearing of main tranny shaft CB750E-1007220 New lower case, deeper oil pan CB750E-1007415 Introduction of circular opening in lower case CB750E-1007500 End of sandcast engines CB750E-1009554 Finned oil filter casing CB750E-1010336 Additional oil passages, new rocker shafts and valve cover CB750E-1014996 Revised exhaust valve guides & valve guide seals CB750E-1026144 new cylinder head, cylinder block: new central M6 bolt, cyl. block w/8 rubbers. Case with guard to prevent damages from broken 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 oiler CB750E-1044812 Carburetors linked instead of individual cables CB750E-1044968 Improved neutral position CB750E-1056080 New clutch basket CB750E-1064903 Introduction of special washerless bolts CB750E-1068376 Clamp for scavange hoses CB750E-1071336 Fuel hoses 5.5mm dia. instead of 5.0mm CB750E-1113723 Grooves in gear shift drum 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 HONDA CB750 SOHC MODEL CHANGES 1969 - 1978 Classic Cycles Technical Resources
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CB750E- K0 1000001...CB750E-2470427 clutch almost identical to F1: new clutch basket, new clutch cover and chrome cover CB750E-2434657 to CB750E-2439607 New gear shift drum, new center
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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
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
Classic Cycles Technical Resources
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