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It sounds like I'm going to have to take some measurements from my parts bike to see if things will line up properly. I do have a set of PD carburetors but they're in pretty rough shape. There's multiple bolt holes that are stripped out for the float bowls on them, which is why I wanted to use...

Hi everyone. I was just wondering if it is possible to run a set of carbs from a k3 on a motor from a later f2 or f3? I believe everything will bolt up fine, but I'm curious if there is a rule of thumb for jet sizing and neddle height with this combination?

I guess I'll be pulling the motor out this weekend to find out. Hopefully it's not too cold out. There is no heat in my workspace. I'll post picture as I go.

So there is no casting mark on the head of the parts bike. The engine number correlates to a k4 I think. The whole bike seems to be Frankensteined together. Its got a K frame and F air box and oil tank. I am wondering if they mixed and matched part in the engine as well. Is there any other...

Good information. I will check the casting number tonight. If it is an F2 I am planning on using the cylinders, pistons and head from the F2 motor and the bottom end from the k3. I believe that all the oil passages and compression ratio should be correct then. I will also be getting all my...

http://www.hondachopper.com/engine/engine_mods/modifications.html So based on the link above if the F motor is from an F2 or F3 it will have bigger valves. Sounds like a winner to me. Can the older style carbs be used on the F head as long as I have F carb boots?

So I ened up getting a cheap parts bike, which I believe has a 750f engine in it. I am now debating which cyclinder head would be the better choice to use for my bike. Both heads are going to need a valve job. Is there any performance reasons to go with the later f head over the k?

I am along the same line of thinking. But I wasn't thinking about heavy duty studs. Are you talking about head studs or main studs? Are they a common failure point on uprated engines?

So I ened up getting the bike. The good things is that it doesn't seem to have any hack work done to it. The gauges and the tank are from differnt bikes but still 750k parts, and they are in good shape. The see any issues with the bottom end. I plan on inspecting the oil pump and the primary...

I have been there. Thats where i got the idea for the cams. Their big bore kit is interesting as well. I'm hoping to not have to replace the pistons but if the cylinders need bored than why not go bigger, right?

I am planning on stock but if parts need replaced than I will likely upgrade them. First priority is to get it running reliably. Mods that sound interesting would be electronic ignition, maybe a mild cam. Also debating exhaust options. 4 into 2 into 1 is the way I'm leaning because stock 4 into...

The frame is unaltered. It was one of my buying requirements. The engine was set back on the frame after disassembly. I am planning to do a full inspection of the motor before reassembly. I am located in east coast canada and the picking are pretty slim out here right now.

As I said I'm not too scared of the mechanical side of things. Is there a particular reason you would stay away from this particular bike. I figured that worst case scenario I would have to source an engine if the current one isnt salvageable.

A few little things that I've noticed so far is that its got a later style fuel tank, with the petcocknon the left. And one of the gauges has been swapped (one blue faced and one green) not sure what one if either is correct for a 73. I will be looking to get a factory seat for it, and I know...

Hello everyone. I am new here and dont actually own a cb750 yet but I am looking at buying one for my next project. I am currently looking at a k3 that had a burt cam journal. The bike comes with a spare head. I have a fair amount of mechanical experience so I am not afraid of mechanical work...