Engine swop

[D10XUP]

I have a 1990 exup and i have just bought a 1993 motor as a replacement for the 90 ( as it needs a valve job doing) what are the main differences between the 2 motors. I know that there is a difference in how the oil is cooled but do the 2 motors differ internally and will there be any problems using this 93 motor in place of the 90 motor. any advice welcome Thanks. :bfg
Dave.

[wslonger]

'93 has the oil cooler built into the radiator. Not sure if you can use the older seperate units. the '93 has the external cartrige oil filters also big plus IMO.

[D10XUP]

Thanks for the reply, so can i just fit the 93 and do away with the old oil cooler ? or isn't it that simple, i know that the radiator is a different unit than the 90 version.

Dave.

[creed12r]

The 93 has the oil cooler built into the oil filter housing, and the radiator is different as you have found, if you have the complete 93 unit with coolant pipework etc you will have no difficulty and can swap any radiator pipes that are different.
All the rest of the engine will fit no problem.
chris

[D10XUP]

Cheers for the advice, much appreciated, that is what i thought but no harm in asking first . thanks

Dave.

[barneyfzr600]

Wouldn't the Iggy Box/Wiring Harness need to be replaced? Not very sure on that one! All I know is that the '87-'88, '89-'90, '91-'93, and '94-'95 bikes are different!

[exup freak]

ime doing the same job only flowing the head and a 1040 kit swap the r sump and pipe work on to the ru it will all fit i prefer the seperate oil cooler + keep the r cdi it haz a higher red lind (all u ru riders dont need a power pack just a r cdi) or even a genisis 1

[ChuckD]

In order to use a 93 in a 90 set-up, you must change the Oil pan, pump, filter housing, oil piping internally. All components from the 90 must be installed on the 93 engine. If you want to go the other way and use the 93 cooling system, which uses a spin-on, you will need to go with a 93 radiator. I have 5or 6 posts on this procedure in here somewhere. If you need more help let me know. I have done this conversion in both directions and am very familiar with what needs to be done.

[D10XUP]

Thank for advice Chuck i have just fitted the 93 motor in to my 90 frame and got myself a radiator from a 93. so i just have to fit the rad. will it fit on the 90 mounts or do i have to make some brackets up? as it looks a bit different to the 90 rad.

Dave.[/b]