Engine full of fuel and seized up

[PJM47]

Yes will turn completely revolutions in either direction

[Trigger]

I can not come up with anything else, i would have to see it up close and personal to see what is going on.
I would say, pop the engine out and throw it in the car and bring it to my workshop but, it is not that easy to just pop a CB750 SOHC engine out.

[K2-K6]

Worth pulling the sump off and having a look up in there.  It's pretty easy as doesn't disturb anything.

See if you've any "spare parts" lying in there.

Oddly I was in your area 3 weeks ago to collect a tent I bought on the bay of E, and was followed by an F2 along the old A3.

If you can't take up Trigger's offer I could come down to have a look with you at some point.

[McCabe-Thiele (Ted)]

This post is a real mystery it will be a revelation when the cause is found.

[MrDavo]

We should have a sweepstake.

No idea what, but given the circumstances in which it happened, my money is on something, maybe in the gearbox, being bent, which isn't going to unbend itself. Maybe it wants to be in an 'impossible' gear.

Unfortunately the only way to find out what, and fix it, is to dismantle. When my crank went up the pictures I got my engine out in an afternoon (with help with the lifting), you can then turn it upside down and split the cases without touching the top end, if I remember right. If not someone will be along soon to call me an idiot.

Then K2-K6 will tell me how long Honda allowed for an engine removal....

[K2-K6]

  "Then K2-K6 will tell me how long Honda allowed for an engine removal...." I'm not from official workshops so haven't a clue  Bryan and Ken usually know that in more detail.

Lifted many of them out though,  in a more relaxed fashion  usually trying to be real careful not to scratch anything.

[PJM47]

Thanks for all the offers of help folks. Gives me confidence to get on with it knowing there’s help if I get stuck. I am resigned to engine out now but just wanted ideas of what it might be and what to look for before I start as the symptoms didn’t make much sense. Hopefully it will become clear with the engine out. I’ll keep you posted on progress, it is an interesting one.

[Trigger]

"Then K2-K6 will tell me how long Honda allowed for an engine removal...." I'm not from official workshops so haven't a clue  Bryan and Ken usually know that in more detail.

Lifted many of them out though,  in a more relaxed fashion  usually trying to be real careful not to scratch anything.

I can't remember what the book says on hours for a engine removal on a 750 but, i had a customer that had a quote for £665 engine removal on a 750 then the same again to get it back in plus £45 a week storage charge for the rolling chassis until i rebuilt his engine and then £225 set up fee including tuning 

[K2-K6]

You'll have to take the sump off to get it out anyway,  so might as well have a sneaky peak now to see if you can spot anything.

[Trigger]

Show us a picture of the inside of the sump pan. We love pictures on here 

[MrDavo]

Blimey, I’d take engines out all week for £665 a pop. I’d need my 6’7” human engine hoist mate too, but he’s happy to work for cups of tea.

[royhall]

I think that's a classic case of pricing yourself out of the job because he didn't want to do it.

[SumpMagnet]

I've only taken one 750 motor out...and it was a traumatic experience. Also invovled a quick break to visit casualty after I cut my hand doing it when the motor slipped and a fin squished my hand against the frame. Still...it's all part of the learning curve.

Having shifterd a KAwasaki 750 motor on my own before...I was unprepared for just how damn heavy the 750-4 engine is

[Trigger]

I think that's a classic case of pricing yourself out of the job because he didn't want to do it.

Nope, as i asked about and that is a standard rate these days at a main dealer. They would have to carefully store the exhausts, tank,  side panels and the rest of the bike. Then not damage the bike frame in any way or the customer could claim.

[royhall]

Wow. £1330 to take take an engine out and put it back again. I'm in the wrong job. Bloody hell!!