probably 1.39652%
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Question regading frame and engine numbers
- Thread starter jbird7262
- Start date
slim to non but could happen
steve milich
CB750 New member
ok thanks thats what i thought
Hallo everyone,
i just bought an Honda cb750 from 1975 (on paper) with frame number CB750-2103224 and engine number CB750E-2422131.
I was searching online for parts but i'm not really sure about the model.. K or F model.
Can some one explain me how to find that?
thank you.
i just bought an Honda cb750 from 1975 (on paper) with frame number CB750-2103224 and engine number CB750E-2422131.
I was searching online for parts but i'm not really sure about the model.. K or F model.
Can some one explain me how to find that?
thank you.
If it was an F the frame would be cb750f-whatever number and the engine would be a cb750FE-whatever number. But I notice it says your in Belgium? Maybe there are some serial number differences outside the US Because by the numbers the frame is mid year K2 or 72 but the engine is a late K5 or 75. I dont think they had different serials for non US bikes until the K6 but I could be wrong, I only know the US stuff.
Ralf
CB750 Member
Hi, here you can find the european engine Numbers and the models belonging to it. It is in german Language, but google translater will make it. Greetings from Germany, Ralf
Changes to the engine from K0 to F3
engine number
CB750E-1000001K0
CB750E-1000140 Changed screw on output from M8x80 to M10x82
CB750E-1000220 new lower case, case only sold as a set
CB750E-1000425 Transmission change for better shiftability
CB750E-1001081 New crankshaft
CB750E-1001760 7 instead of 8 clutch discs
CB750E-1003528 New driveshaft and pinion
CB750E-1005307 Transmission mainshaft right bearing with locator
CB750E-1007220 new lower case, deeper sump
CB750E-1007415 Introduction of the round opening in the lower engine case
CB750E-1007500 end of sand cast engines
CB750E-1009554 Ribbed Oil Filter Housing
CB750E-1010336 Camshaft bearing blocks with additional oil lines, new rocker arm shafts and valve covers
CB750E-1014996 New exhaust valve guides, new valve stem seals
CB750E-1026144 New cylinder head, cylinder block: central M6 screw, block with 8 instead of 12 rubbers. Housing with protection against broken drive chains. New sprocket cover, new shift mechanism with 11 parts instead of 7
CB750E-1042806 Softer clutch springs
CB750E-1044813K1
CB750E-1044805 New housing, secondary ratio 18/48 instead of 16/45 or 17/45, chain oiler
CB750E-1044812 Carburettor with linkage instead of individual passages
CB750E-1044968 Better idle
CB750E-1056080 New clutch basket
CB750E-1064903 Special screws without washers
CB750E-1068376 Clamp for breather hose
CB750E-1071336 Fuel hose 5.5 mm diameter instead of 5.0 mm
CB750E-1113723 Changed grooves in shift drum from 0.5mm to 1mm on 4th and 5th gear
CB750E-1114461 New head gasket
CB750E-2000001K2
CB750E-2061311 Shorter oil hose with white marking. Main jets 110, smaller cutouts in the air filter housing
CB750E-2200001K3
CB750E-2200001 New cylinder head, new valve stem seals, improved oil feed to camshaft, new piston rings (three-piece oil scraper rings), new camshaft chain guide, larger wrist pin retainers, new drive shaft, new sprocket cover
CB750E-2228679 New cylinder head, new valve guides and valve stem seals, no more rubber between the cooling fins
CB750E-2300001K4
CB750E-2304501 New cylinder block, smaller camshaft chain tunnel
CB750E-2352923 New cylinder block
CB750E-2348093 Gear indicator on shift cover
CB750E-2372115 K5
CB750E-2428762K6
CB750E-2470427 Clutch almost identical to F1: new clutch basket, new clutch cover and chrome cover
CB750E-2434657 to CB750E-2439607 New shift drum, new central shift fork for better shiftability. Gears on the auxiliary shaft with bronze bearings, new motor housing
CB750E-2700001K7
Carburettor with accelerator pump, shorter intake rubbers, new output shaft. Sprocket with central screw, wider chain alignment (like F2), secondary ratio 15/41, new clutch, new camshaft (like F1), new pistons (like F), compression 9.2:1. New gearbox: 4th gear 1.133 instead of 1.087. Output gear 50 teeth instead of 56 (like F1), primary ratio 1.985 instead of 1.708
CB750E-2719530 New valve guides
CB750E-2719997 New camshaft bearing blocks (same as F2)
CB750E-3000001K8
New intake and exhaust valves, new valve spring retainers and wedges
CB750E-3021913 New cylinder block with larger chain channel
CB750FE-2500004 F1
New camshaft, carburettor with additional idle air. New pistons, compression 9.2:1. New engine case without chain oiler. Secondary translation 43:50 instead of 48:50. 4th gear on main shaft 31 instead of 30 teeth, 5th gear on auxiliary shaft 31 instead of 32 teeth
CB750E-2600014 and CB750GE-1000014 F2
New cylinder head with larger valves (34/31 mm instead of 32/28 mm), larger combustion chamber, larger intake rubbers, stronger camshaft chain, new camshaft, harder valve springs, new spring plates, valve wedges, new pistons, compression ratio 9:1. New connecting rod bearings and connecting rod foot bolts, stronger clutch springs, additional cooling ribs on the crankcase, oil sump with larger cooling ribs, "oil cooler" - intermediate plate with cooling ribs between the oil filter and the engine. Secondary gear ratio 15/43 or 14/43.
CB750E-3100001 F3
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Changes to the engine from K0 to F3
engine number
CB750E-1000001K0
CB750E-1000140 Changed screw on output from M8x80 to M10x82
CB750E-1000220 new lower case, case only sold as a set
CB750E-1000425 Transmission change for better shiftability
CB750E-1001081 New crankshaft
CB750E-1001760 7 instead of 8 clutch discs
CB750E-1003528 New driveshaft and pinion
CB750E-1005307 Transmission mainshaft right bearing with locator
CB750E-1007220 new lower case, deeper sump
CB750E-1007415 Introduction of the round opening in the lower engine case
CB750E-1007500 end of sand cast engines
CB750E-1009554 Ribbed Oil Filter Housing
CB750E-1010336 Camshaft bearing blocks with additional oil lines, new rocker arm shafts and valve covers
CB750E-1014996 New exhaust valve guides, new valve stem seals
CB750E-1026144 New cylinder head, cylinder block: central M6 screw, block with 8 instead of 12 rubbers. Housing with protection against broken drive chains. New sprocket cover, new shift mechanism with 11 parts instead of 7
CB750E-1042806 Softer clutch springs
CB750E-1044813K1
CB750E-1044805 New housing, secondary ratio 18/48 instead of 16/45 or 17/45, chain oiler
CB750E-1044812 Carburettor with linkage instead of individual passages
CB750E-1044968 Better idle
CB750E-1056080 New clutch basket
CB750E-1064903 Special screws without washers
CB750E-1068376 Clamp for breather hose
CB750E-1071336 Fuel hose 5.5 mm diameter instead of 5.0 mm
CB750E-1113723 Changed grooves in shift drum from 0.5mm to 1mm on 4th and 5th gear
CB750E-1114461 New head gasket
CB750E-2000001K2
CB750E-2061311 Shorter oil hose with white marking. Main jets 110, smaller cutouts in the air filter housing
CB750E-2200001K3
CB750E-2200001 New cylinder head, new valve stem seals, improved oil feed to camshaft, new piston rings (three-piece oil scraper rings), new camshaft chain guide, larger wrist pin retainers, new drive shaft, new sprocket cover
CB750E-2228679 New cylinder head, new valve guides and valve stem seals, no more rubber between the cooling fins
CB750E-2300001K4
CB750E-2304501 New cylinder block, smaller camshaft chain tunnel
CB750E-2352923 New cylinder block
CB750E-2348093 Gear indicator on shift cover
CB750E-2372115 K5
CB750E-2428762K6
CB750E-2470427 Clutch almost identical to F1: new clutch basket, new clutch cover and chrome cover
CB750E-2434657 to CB750E-2439607 New shift drum, new central shift fork for better shiftability. Gears on the auxiliary shaft with bronze bearings, new motor housing
CB750E-2700001K7
Carburettor with accelerator pump, shorter intake rubbers, new output shaft. Sprocket with central screw, wider chain alignment (like F2), secondary ratio 15/41, new clutch, new camshaft (like F1), new pistons (like F), compression 9.2:1. New gearbox: 4th gear 1.133 instead of 1.087. Output gear 50 teeth instead of 56 (like F1), primary ratio 1.985 instead of 1.708
CB750E-2719530 New valve guides
CB750E-2719997 New camshaft bearing blocks (same as F2)
CB750E-3000001K8
New intake and exhaust valves, new valve spring retainers and wedges
CB750E-3021913 New cylinder block with larger chain channel
CB750FE-2500004 F1
New camshaft, carburettor with additional idle air. New pistons, compression 9.2:1. New engine case without chain oiler. Secondary translation 43:50 instead of 48:50. 4th gear on main shaft 31 instead of 30 teeth, 5th gear on auxiliary shaft 31 instead of 32 teeth
CB750E-2600014 and CB750GE-1000014 F2
New cylinder head with larger valves (34/31 mm instead of 32/28 mm), larger combustion chamber, larger intake rubbers, stronger camshaft chain, new camshaft, harder valve springs, new spring plates, valve wedges, new pistons, compression ratio 9:1. New connecting rod bearings and connecting rod foot bolts, stronger clutch springs, additional cooling ribs on the crankcase, oil sump with larger cooling ribs, "oil cooler" - intermediate plate with cooling ribs between the oil filter and the engine. Secondary gear ratio 15/43 or 14/43.
CB750E-3100001 F3
Cookie Policy
This website uses cookies to store information on your computer.
Do you agree?
https://cb350-750four.de/technik/anderungen-am-motor-k0-f3/
