Advice wanted Rf900 lump in oil cooled slingshot frame

[Swirl]

As it says above how hard is it to sling a water cooled Rf900 motor in a spare oil cooled 1989 slingshot frame I've got knocking about

Edited February 10, 2016 by Swirl
missed a bit out

[Rene EFE]

Not very clued up on the watercoolers, but if you keep the RF lump in one piece, you're gonna have a hard time with the carbs (downdraft)

Easy fix would be an R head, but don't know if it's as easy as just swapping one for the other.

[snoorder]

I'm with Rene, It's not going to be an easy fit because of the RF900 downdraft carbs. I have read somewhere on the old forum that the head can be exchanged for a 750W head with normal carbs. At least then the engine should fit in the frame.

Next challenge would be the engine mounts and location of the sprocket. Again I don't know the details but there are some differences. Unfortunately because I like the idea of an oilcooled engine in the (better looking) watercooled frame... It has been done but it's a lot of work.

[Swirl]

unsure on carb set up but know there 40mm of some sort, just an idea milling round in my head

[Gammaboy]

RF900 carbs are ~36mm downdrafts - flat out not going to fit in an oil cooled frame.

[Swirl]

I bought a full Rf9 the other day, Ooooppppssss, so no need to worry about it going in the frame now.

[gixxerturbo]

I had a 93 750 with a RF9 engine and i used the 750 head from the oem engine but I remember the compression was really high and I had my head machined the other option would be a really thick headgasket or a spacer on the bottom of the cyl like many people do with turbo bikes to lower the comp rate.