Topic: Cb750/650/400 all in one build

[hill29493]

Think it looks better like this me thinks

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[hill29493]

Think it looks better like this me thinks

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Cb750/650/400

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[Nicklopic]

Every topic you've made about the bike has been super vague with the same blurry pictures. What's the deal? Do you have questions? Do you want to show it off? Maybe make a build thread and share some details maybe?

[Alan F.]

"It's not just a 650 it Has a 400 super 4 gearbox 750 cylinders and pistons with 650 cam and crank"

I wonder,
an 82 CB650 has a stroke of 55.8mm and a compression ratio of 9:1

a 78 CB750K has a stroke of 63.0mm and a compression ratio of 9.2:1

What does your hybrid have for compression and how much did you have to deck those 750 cylinders to get it?

[Nicklopic]

"It's not just a 650 it Has a 400 super 4 gearbox 750 cylinders and pistons with 650 cam and crank"

I wonder,
an 82 CB650 has a stroke of 55.8mm and a compression ratio of 9:1

a 78 CB750K has a stroke of 63.0mm and a compression ratio of 9.2:1

What does your hybrid have for compression and how much did you have to deck those 750 cylinders to get it?

From his pictures, it just looks like a standard 650 with a seat on it.

[Alan F.]

We've seen some wild claims before, it's nothing new.
Without more info it's a mystery to me if it can be done at all.

[hill29493]

.

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[hill29493]

Don't know the compression don't even know if it will run just something I'm trying with left over parts if it runs it runs if not don't really mind

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[hill29493]

Compression is at 9.0.1

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[Alan F.]

What machine work was needed?

[hill29493]

The cylinder jugs have been skimmed as the 750 jugs are a few mm higher

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[hill29493]

There is actually only 2 bolts that don't line up 1 at the front on one ant the back

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[Nicklopic]

Your picture proves nothing here though. That picture looksss like its just laying on top of a 750 bottom end with those studs. A few millimeters would have taken significant material off the top of the block/jugs. You mean to tell me you took 6+mm off the deck? IDK how you still only have 9:1 compression if that set up is anywhere near okay.
Again, I see a 650 with a 650 motor and some seat tossed on. I see nothing that makes me thing you built some kind of wild hybrid here. I don't see any wild gearbox mixed in. Are you trying put together some story to flex for some internet clout or something? I don't get it.

If this is actually legit show us, give us some math, how/what you did. We'd be impressed... if it existed.

[Alan F.]

I'd be interested in reading how and why, because I don't know off the top of my head why not. There are plenty of members here that could support or debunk, but I don't see anyone other than Nick and myself posting here.

More info would be nice, I'm skeptical but trying to maintain decorum.

[hill29493]

There will be a video on YouTube when iv finished on how iv done things. And like I said I have no idea if it will work. Look iv only come on here to show people what I'm doing and to ask advice on things if I get stuck but all you lot can do is shoot people down is that what this forum is about shooting people down. Will if it is your not worth the piss and my knowledge I'm only 36 and it seems I know a hell of a lot more than you all

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[Nicklopic]

There will be a video on YouTube when iv finished on how iv done things. And like I said I have no idea if it will work. Look iv only come on here to show people what I'm doing and to ask advice on things if I get stuck but all you lot can do is shoot people down is that what this forum is about shooting people down. Will if it is your not worth the piss and my knowledge I'm only 36 and it seems I know a hell of a lot more than you all

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Bruhhhhh your making claims but what youre showing isn't backing up your claims. I don't claim to know jack, or even what im doing... but I have a 650 and I know what the motor looks like prettyyyy well. I do NOT see a 400 bottom end here. and your proof of the 750 jugs was literally nothing. I like cool 650 stuff, like the dude adapting a vfr charging system, or making weird components work. If youre doing this id be hella interested, but you haven't shown anything. SHOW US WHATS GOING ONNNNNN. Ill admit I was wrong if you show us

[Alan F.]

Thank you for your assessment.

Mr. Millyard has some surprising accomplishments but the simple explanations given for them are sufficient even for the technically minded.

Your bike seems a very interesting combination, I wait patiently for more information but the drama seems to get the best of everyone these days.

I can't help but wonder why after all these years this combination of parts hasn't been used before.

[Alan F.]

There will be a video on YouTube when iv finished on how iv done things. And like I said I have no idea if it will work. Look iv only come on here to show people what I'm doing and to ask advice on things if I get stuck but all you lot can do is shoot people down is that what this forum is about shooting people down. Will if it is your not worth the piss and my knowledge I'm only 36 and it seems I know a hell of a lot more than you all

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Bruhhhhh your making claims but what youre showing isn't backing up your claims. I don't claim to know jack, or even what im doing... but I have a 650 and I know what the motor looks like prettyyyy well. I do NOT see a 400 bottom end here. and your proof of the 750 jugs was literally nothing. I like cool 650 stuff, like the dude adapting a vfr charging system, or making weird components work. If youre doing this id be hella interested, but you haven't shown anything. SHOW US WHATS GOING ONNNNNN. Ill admit I was wrong if you show us

I believe the idea is that a 400F 6-speed transmission was fitted to the 650 cases. I have no knowlege of the measurements or custom parts needed to accomplish this, but I will wait to understand better.

[Nicklopic]

I have no idea what he means, he hasn't explained it and from other posts it sounded like it he put a 650 crank into a 400 bottom end, with 750 jugs, and a 650 head. I could have read it wrong

[Alan F.]

The transmission is just a set of gears that are fitted into the rear section of the lower engine cases. I think he swapped the 650 5-speed for the 400f 6-speed, no small feat, I'm sure some custom machining was required at no small cost.

Hill are you a machinist by chance?

[hill29493]

There will be a video on YouTube when iv finished on how iv done things. And like I said I have no idea if it will work. Look iv only come on here to show people what I'm doing and to ask advice on things if I get stuck but all you lot can do is shoot people down is that what this forum is about shooting people down. Will if it is your not worth the piss and my knowledge I'm only 36 and it seems I know a hell of a lot more than you all

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Bruhhhhh your making claims but what youre showing isn't backing up your claims. I don't claim to know jack, or even what im doing... but I have a 650 and I know what the motor looks like prettyyyy well. I do NOT see a 400 bottom end here. and your proof of the 750 jugs was literally nothing. I like cool 650 stuff, like the dude adapting a vfr charging system, or making weird components work. If youre doing this id be hella interested, but you haven't shown anything. SHOW US WHATS GOING ONNNNNN. Ill admit I was wrong if you show us

Well you'd know know the internals are near enough the same the gear box was swapped in the early 90s by my father who was an engineer for rio tinto but it revved out to quick and snapped the cam chain and not was sat there until I started on it you said you know these bikes but yet you not noticed 750 k forks and front wheel and you got the year wrong it's a 79 not 82. And like I said all bolt line up apart from 2.and another thing your going on about the jugs and crank cases no1 said the cases were changed

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[hill29493]

I have no idea what he means, he hasn't explained it and from other posts it sounded like it he put a 650 crank into a 400 bottom end, with 750 jugs, and a 650 head. I could have read it wrong

400 gear box in a 650 not other way round with 750 jugs

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[hill29493]

The transmission is just a set of gears that are fitted into the rear section of the lower engine cases. I think he swapped the 650 5-speed for the 400f 6-speed, no small feat, I'm sure some custom machining was required at no small cost.

Hill are you a machinist by chance?

Tnat is exactly what I've done

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I am not a machinist no but my father was an engineer before he past away

[Alan F.]

Thanks, don't pick on me for not noticing things in your photos, it's the intellectual exercise that I'm focusing on.

Cb650 was SOHC from 79 to 82 in the States, I've never owned one.

[seanbarney41]

400 6 speed swapped into a 550 is well documented on this forum...it is in a race bike...can't think of members name atm.  Yes it required some machine work.  I think one gear had to be custom made.  Hopefully, he should be along shortly to explain the details.

Hill, you have to admit you did not explain things very clearly after a few posts in different places.  Nicklopic usually seems like a good guy.  I'm sure he will calm down as the story unfolds...