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The 17inch wheel maybe a bit of a curve-ball and could have been retro-fitted to it.They certainly sound like mid production series models from the details.I guess if you "cafe" one of them you'll only be doing what others have and will only know how you feel about in years to come. It's quite personal how anyone has their bikes though so free choice really.If you didn't get them they may not have been back running at all, and it can be done so that it's possible to return to original if the mods are all bolt together.
The 77K DID NOT have a hidden oil filer cap, only the "F" did, so I think you have a 77 "K" which were not common in the UK, did not sell very well and are a nightmare to get original parts for as some bits are different so if it was me thats the cafe one!!
Mick, I think you missed a number out, shouldn't it be 35 years!
The engines are awkward buggers to get in and out of the frame, i found that having the sump off exhaust studs off and all the casings made the job a bit easier, but now i have done a frame mod so i can dismantle the top end in the frame, this is probably one of the best mods you can do on these 750's , it makes working on the engine a real pleasure , and being able to disasemble the engine's top end also lightens the load to make engine removal a doddlePete
From memory I think that when you've removed the housing on top of the cam cover you have to rotate the front of the engine upwards until it virtually touches the top frame tubes, this allows the back of the gearbox to pass the frame mounts next to the kick start as they are both nearly the same shape.Once you get the correct move on it you'l find it easier than it first looks.The Cafe stuff you are thinking about, Honda has some really cool stuff that could give you an influence from the racers of that era. Just google CR750 and flick it to images to see some of the designs/colours/stance that was running then.I guess traditional brit cafe racers just ripped off the racers of their day with long alloy tanks, single seats and dropped bars from track stuff all black and silver/bare metal so it would seem right to go the same way with Honda's own heritage.
Been to bike racing since I was born with family and friends doing bits of racing, so completely indoctrinated I guess.Ran 750 SOHC Hondas in late 70's, CB900 and CBX 750 in the eighties, We really smoked these things around then and they treat them so gently now. Funny enough I had a conversation today with someone that was happy to persuade her son-inlaw to give up bikes and sat there thinking I've never thought of being without a bike, ever.Guess it keeps me out of trouble!
When i was in the trade a "cafe" was worth less than standard as everybodies taste is different, Parts are always out there, just some of it is expensive!