Topic: Engine serial number question

[Cougars750F0]

The serial number for on my 1975F0 engine is: CB750E-2514580 and the frame serial number is 1014523. My question is what does the "E" stand for on the engine number? Engine? Thanks in advance

[Xnavylfr]

YES= the E stands for ENGINE and don't worry that the frame and engine #s don't match. They never have on CB750.  Only if you have a CB750K
The cb750F engines can have F or E on it.
and the AUTO engine has an A and E on it.


Xnavylfr(CHUCK)

[Cougars750F0]

Ya dumb question! Just looked at my 68 CB450 Same thing CB450E-3020515 The numbers also don't match. Its great to know that I have an engine and not something else Thanks for helping me clear that up! Cougar

[lucky]

That is why in California the DMV always asks for frame number AND engine number.

Of course we all know how easy it would be to find out which engine was supposed to be in which frame. LOL

[JimJamerino]

Wouldn't it be something to happen across an engine that matched your frame number? 

[Cougars750F0]

I'm in Oregon and the DMV didn't care at all about the engine numbers. I was disappointed because it could help clear up a lot of issues. DMV also would not list the odometer reading ether because of the age of the bike yet they provided a place on there form to include it witch I did and when you receive the title there is a place to have the mileage listed it but they leave it blank . Plus they didn't tell me anything about it when I was there filling out the paper work to register in my name I only found out after receiving the title in the mail and calling them because I thought it was a mistake. If you want the the odometer information listed you are required to fill out a form for supplemental information that of course is an extra expense and I would have to have a new title reissued. They will research the previous title for the information even though the title that I provided them listed it and it also matched the odometer reading. My bike has only 9,657.8 original miles on it so I wanted it listed. Whats up with that?   

[Xnavylfr]

Lucky!!! PLease tell us HOW you can find out what engine number should be in your frame. I'd really like to know!!!
 HONDA built MILLIONS of these motorcycles and millions of engines,  neither were built in the same area of the factory,there were probably 5000 engines built and backed up before the frames came available. For example a 1975 F has frame# of CB750F-1000002 and the engine# (STARTS)CB750F or E-2500004.

http://www.hondachopper.com/engine/engine_timeline/timeline.html

They put the engines in as the bike s came available and didn't worry about matching ###

 The ONLY bike I can only think of that ENG.and FRME#S match were HARLEYs and BRIT bikes because in the 50/60s the HDs were registered by engine#( which matched the frame) People didn't want to steal the frames they want the engine for a chopper..
If someone tells you you CAN'T own a M?C registered by engine only they are full of it.
If the bike started out in the NE where that was how M/Cs were registered  originally then other states will continue to register it for you by engine#

BEEN THERE AND DONE THAT and NEVER had a problem!!!


Xnavylfr(CHUCK)

[Cougars750F0]

My 1973 Triumph Bonneville 750 has matching numbers on the engine and frame. Finding a Honda with matching numbers would be like winning the lottery. It would really lucky! Wait! Someone  could start a thread for posting engine numbers and when enough people find a match they could switch engines 

[Xnavylfr]

The engine thread would be a lottery in itself!! If you haven't noticed when a thread is posted , there is a greater percentage of  readers than posters. So just to get people to check their engines # is about useless!


Xnavylfr(CHUCK)

[Stilltime]

I'm not sure how the 550's were numbered, but for kicks I checked mine while working on it tonight.

CB550K-2116543
CB550E-2116593

I was so close!  Only one digit and 50 units apart...

Chris C.

[dave500]

i had two 550 engines each came from far away states,,they were ten numbers apart,,so those engines wouldve been down the line together,sold half way across the world miles apart,then both end up at my place 40 years later?

[Tews19]

i had two 550 engines each came from far away states,,they were ten numbers apart,,so those engines wouldve been down the line together,sold half way across the world miles apart,then both end up at my place 40 years later?

Congrat Dave on your 8000 post!

No one mentioned his engine number though. Is it a K engine? If it is, it's an early 70-71 engine.