Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: captaink on August 28, 2015, 03:30:38 PM
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Hi, I have ordered some engine parts for my 750 Rickman but every time they seem to have trouble with the engine number
It's on the v5 as the original 1979 rickman engine
It's a black F2
Serial no. F2750E 2248782
Any thoughts as to confirming the age
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I always thought they (Honda UK ) used the frame number to give model and date of manufacture,
maybe Bryanj could use your engine number to give you some idea
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Silly question, but who are you trying to order parts from, some places are much better than others, I have found a lot of high street Honda dealers really can't be bothered to look things up properly, I have even had one turn round and say " Try a scrapyard where something that old belongs!" I was only wanting a kickstart oil seal, needless to say I didn't go there again!
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I just wanted to confirm the engine date as the frame has a rickman serial number.
But David silver says it's a k5 number but it is an f2 engine for sure so later.
I have located a supplier of F2 parts being Suzuki performance spares ltd. they do Honda parts as well and have in stock F2 APE valve guides, springs etc. F2 valves are kibblewhite and delivery of about 2-3 weeks.
I have ordered these so the head overhaul can progress.
They also do the 836cc big bore kit.
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try this link to the US site,
http://www.sohc4.net/cb750f-serial-numbers/
will try a cut n paste
Model Production
CB750 F 15,000
CB750 F1 44,000
CB750 F2 25,000
CB750 F3 18,400
CB750F SERIAL NUMBERS
Model Model Year Production Dates Frame # Engine #
CB750 F0 1975 Jan 1975 – Feb 1975 1000002 to 1015054 2500004 to 25115085
CB750 F1 1976 Mar 1975 – Nov 1976 2000003 to 2022317 2525094 to 2563530
CB750 F2 1977 Nov 1976 – May 1977 2100011 E2600004
CB750 F3 1978 May 1977 – May 1978 2200001 E3100001
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Honda engine number always start with CB never F2 so if it is that it is NOT an original number
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Have a look at this picture of my casings, the engine was black , factory coating .
It does not look like it's been tampered with and there's not any evidence that any things been messed with.
Perhaps Rickman added the numbers when new, ?
?????????????
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Thats not a Honda stamping--too irregular and doesnt look right, new cases come unstamped and I suspect rickman re-built a damaged engine and restamped a number but got it wrong
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Interesting!
It was also suggested to me that Rickman bought the engine new and unstamped and built the bike.
I know v5 s can have numbers changed but this appears all 1979
The engine appears though to have never been apart, there's no sign at all of any damage. In fact it appears in very good condition
The engine parts are also F2
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To the best of my knowledge Honda never supplied complete engines only all the parts but if an engine with damaged cases was rebuilt by a good mechanic it would look original
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The mystery continues !
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Wrong font, Rickman would of used new crank case's with a blank plate and put there own numbers on. Not uncommon ;)
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The other suggestion was that someone purchased the Rickman kit and transferred there engine and other bits to it, then changing the details on the v5 with dvla ?
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Doent alter the fact that the number looks wrong with the wrong typeface
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I split the cases and I believe they have not been apart before but who knows !
The numbers may or may not be factory stamped !
So what's the conclusion ?
The engine was black, it's got bigger valves so it's f2
In the end it matters nothing but as long as the new parts I order fit ...who cares
Question though...... Would all the bottom half of the engines be the same ?
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If you check the underside of the head the casting is unique to the F2. The oil drains are cast different to the k's. The F2 head won't fit a k block.
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Thanks for all your comments,
I'll let you know how all progresses
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I think the only difference on F2 cases was the black paint, early 750 cases were different and I know the output shaft bearing changed a couple of times but not sure about the groove for the clip in the cases