SOHC.co.uk Forums > CB750

Frame and engine numbers .

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atlsec:
Hi Guys,
               I have been asked recently by prospective buyers about my frame and engine numbers and I have come to the conclusion that no one knows the full story .One person said there should be no more that 500 difference as it is a K0 ,as K1`s that he worked on had about the same difference .My research has shown that there could be as many as 9500 difference between engine and frame on K0`s alone . This info comes from America and shows 44450 bikes sold but 53300 engine numbers allocated at the same time .We all know the story of the porosity on sandcasts and the breaking chains on K0`s . How can it be only 500 difference from sandcast to the end of the K1 production ?. Does anyone have any concrete evidence on what is correct as it affects prospective purchasers . 
                                                                  Cheers , Alan .

UK Pete:
I thought there is a couple of hundred at most between the two , however what does it matter as long as a k0 has a k0 engine a k1 has a k1 engine etc, it would be no good if you have say an f2 in a k0 for example, if top  money is asked for a bike its best to have the engine frame numbers it left the factory with
pete

atlsec:
Hi Pete,
            I agree totally with you ,however this several hundred business seems to affect everyone ,myself included . I must stop this at once . But after 77000 K1`s and 50000 K0`s how can the difference be the same at the beginning of the run and at the end ?. Surely if no 1 K1 had 400 difference no 77000 must be considerably higher .People still broke chains etc and needed new engines . I think that what you said at the start is right ,if the engine is a K0 and the frame a K0 then that`s it .I do not think you can prove either way what the original configuration was . Honda has no records .
                                           Thanks again , Alan .

JamesH:
Alan, I have several 750's as you know, ranging from K0-6. Several of my bikes have 'close' ranges, but at least 25% fall Outside of the range of 500 apart. I have a very low mileage k2 that has an ~1800 digit variation (engine is 1800 lower) so I really wouldn't get too hung up on it. I'm certain the engine and frame numbers you have were original to that machine..

UK Pete:
At the end of the day alan you are right , there is no written evidence from honda regarding this, i remember someone on the us forum saying about the 200 difference, and as i say as long as the engine is correct for that model it should be fine, i have several 750,s and have not been too concerned about  the #range infact i will have a look now you have bought it up

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