vf700f / 1000f conversion

in one of my previous threads, I talked about putting a 750 motor in my 700. The only problem is that I have been too busy to get the motor out of the frame. The other day, it came up in conversation that my buddy had an old honda sportbike motor/ parts in his garage. It turns out it is a 84 VF1000F. The motor is apparently running. He was going to make a cart with it. I've seen before that the VF1000F Engine Can be installed to a vf 700f/750f frame fairly easily. Is this true? would it be any harder than doing an engine swap for a 750 engine? Also, Does the liter engine have the same cam oiling problems as the 750? This sounds like an absolutely SICK project if it is possible.

 

I believe the 1000 is essentually a 750, different bore & stroke, There is probably some other minor diffs.
But If it was a drop in swap, A bunch of people would have done the swap.

Good luck

 

as far as I understood, the difficulty was actually finding the motor, since it is a pretty rare bike. I don't remember where I saw It, but somebody said they would do the conversion if they could find a good motor, but that's a hard thing to do. They said that it was a drop and swap, but I was looking for other opinions, because I am not looking to become a bike junkyard with tons of parts bikes I will never use.

 

There's a gent down in Oz who did that very swap back in the 90's. PM me and I'll see if I can put you in touch with him. He called that bike 'the Gimp'.

 

The "Gimp" had a kR not F motor, a little trickier since the R's heads are wider. Not sure exactly what they share but I would say you have to address the exhaust if you're going to use the 750 radiators. The big F's front pipes do not bow out to make room for a lower radiator since it's 2nd rad is in the upper fairing. The 1000's cooling is always suspect so using just one radiator is out. Using the 750's exhaust in the 1000 is questionable since it's a smaller diameter. Big deal? Your call. The air boxes may be different but not sure. Probably need the 1000's ignition box, just a guess. Other than that, it should at least bolt in OK.

 

Are You saying that the 1kr motor is easier or harder to install than the 1kf? Could I fit an upper radiator into the vf750 upper fairing?

 

The R is trickier. The heads are larger because of the gear drive. Also, the hard coolant lines under the carbs head to the right, the F's go left to meet the thermostat. I suppose you could get a rad in the 750 upper but I haven't seen what's in there in a while. The fairing is just not meant to have a rad in there along with a headlight and still let air in. I would guess It's more of a hassle than not. If you could do it, you'd need both of the big F's rads, it's not just a matter of adding an upper rad to the 750's existing one. I would be inclined to remake the front exhaust to make room for the 750's lower rad but that's just me. So I guess to answer your question, it's not just a simple drop in and go with the bigger motor but if you're willing/able to do custom work, then it's certainly possible.