Which honda cb750 model have i bought?

[Bardia]

Hey everyone.

I'm new to this forum. Just bought my first honda cb750 today. Hope you guys can help me find out which Exact model the bike is.

Frame number: cb750k-2725568

Engine number: cb750E-272559

See pictures.

And thank a brunch for your help. And do excuse my english, as i'm from Denmark.

[TOOLS1]

You have a K-7 Manufactured in 1977. Also only 9 numbers off between the engine, and frame is really something. Usually they are much further apart.
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[Bardia]

Thank you for helping me out!

How did you find out which models it was ? Been trying to figure it out all day ! :)

When i went to see , i was expecting a dohc engine. But saw that the bike had an external oil tank! And from what i've been reading, dohc has a wet sump, and sohc a dry sump. But still wasn't sure, as i know nothing about motorcycles and got confused. And the cb750 sohc bike are really expensive in Denmark, and Got mine really cheap- so happy to hear that it's a sohc engine!

The bike has done 37.000km and Sounds okay ( from what i Can tell). But thinking about overhauling the Engine, and maks sure that everything is in good condition? Good idea or unnecessary?

[TOOLS1]

If it has compression, and does not knock, there is no reason to touch it! I know of these engines going over 200,000 miles without an issue. However I have seen a lot of low mile engines die an untimely death because someone thought they would rebuild them (I have 4 of them in the garage right now like that.) About the only thing you might want to do is replace some of the seals, and gaskets. The nickles (seals) under the cam towers that seal where the head bolts go through are notorious for leaking, and when they leak, they leak between the fins where the head, and cylinder meet. A lot of guys have killed these engines by thinking it is the head gasket leaking, and taking the engine apart, and not getting it back together.
As for how I found out which model it is, I know the first 3 digits of each model year by heart now, and the "K" in the serial# was a dead giveaway.
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[Bardia]

Thanks for the Quick reply.

Tried to ride it for about an hour today, and it does seem to make a loud knocking sounds. Didn't pay attention to it earlier, since i figered an old bike would not Sound perfect. Should i be worried about the knocking sound, and i presume theres a fix for it, since you mention it ?

Again, thanks for Helping me out! Just ordered a haynes manuel, so i can get startet on making it run smooth.

[TOOLS1]

If the knocking sound goes away as you give it throttle, it is most likely the carbs out of sync. Also you can download the Honda Factory Service Manual for free from the manual link at the top of the home page here.
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[Bardia]

Just waiting for sun to shine in Denmark, before giving it a go - and listning when giving it a little throttle. I found some carb synchronizers online. Guess thats all i need to sync the carbs?

[TOOLS1]

First you will want to adjust the valves, timing chain, points, and timing. Then hook up the gauges, and sync carbs #1,#3, #4 to carb #2. Carb #2 is not adjustable, that's why you sync the others to it.
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