Hey guys this is my first post, i just picked up a 95 vn750. The guy claimed it ran 4 years ago when he parked it. I got it home and after finding electrical problems i ended up putting power directly to the starter just to see if it would turn over and it didnt. Next i pulled the plugs and manualy tried turning it. I got it free and it started to move but only up and down about an inch. Anyone have an idea of what it could be? Im assuming the bore could be rusted and not letting the rings pass it but is there something else to look for? I got a service manual and plan to pull the motor unless theres something i should try first. Also if i do pull the motor how to i go about disconnecting the shaft from it. The manual is not very clear on it and ive only dealt with chain driven bikes. I appreciate any help from you guys and i apologize if this is in the wrong place.

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When you go to remove the motor, the splines of the driveshaft will slip right off and the boot between the bevel gear and the drive shaft tube of the swingarm will just pop off. It can make it easier to remove the bevel gear case from the engine for a little more clearance, but then that's another gasket you have to replace, and it's not really necessary. When I pulled my motor I left it on.

I'm not aware of anything in particular that can seize up the engine partially like that... Might be worth shooting a bit of penetrating lubricant into the cylinders to let it soak in the rings and bores.

It's possible for rust to pile up when you try to turn a rusted engine, but it usually takes more turning than what you described.

More likely is one or more valves stuck open and contacting a piston.

Could be a valve, any of the chains broken or jammed by other broken parts.

You made sure it wasn't in gear? Rolls fine in neutral? I've seen that once out of maybe 8 VN750s I've owned, other models notwithstanding. Another one wouldn't go above 1st and N, but did once I ran it enough.