Replacing a zxr250c motor [Archive]

High_Voltage

25th January 2010, 15:14

How easy is it to change the motors on a zxr250?
Mines got a bit of piston slap and is on its last legs so i either want to sell it as is and buy a cheap 600 or put a recon one in im looking at and get a bit more for it and i can still ride it while saving for a new bike

quickbuck

25th January 2010, 15:22

It's not too difficult. In saying that, if you have to ask, I guess you will need somebody to guide you and give you a hand.
BUT, Piston Slap you say? Why not just find an oversized set, and get it bored to suit?

Are you sure it is piston slap? Or, just a knock from the engine that could be piston slap?

High_Voltage

26th January 2010, 16:42

Ive done car motors before but just wondering if a bikes easier or more fiddly. well ive been told by a few people it sounds like the pistons gone and i had the cam chain replaced too so it isnt that. plus the motor i found is a good deal. $300 for the motor plus some spare oversized bores and pistons which i can put on my old motor. but cheers anyway

R6_kid

26th January 2010, 16:58

I did it completely by myself on a ZXR250A from bare frame to road legal bike. It's not hard at all but you have to have a plan and process otherwise it'll be a bitch. I can come help out if you need a hand.

The fact that you are taking a motor out first makes the process of putting a replacement one in a lot easier. Take photos, bag up bolts and label the bags. If you think things through before you start it'll be a simple process putting it back together. From memory there are two mounts at the back (one is a pivot which) and then there is one on either side of the motor. After that it's just exhaust/radiator/carbs/electrics etc.

quickbuck

26th January 2010, 20:21

Ive done car motors before but just wondering if a bikes easier or more fiddly. well ive been told by a few people it sounds like the pistons gone and i had the cam chain replaced too so it isnt that. plus the motor i found is a good deal. $300 for the motor plus some spare oversized bores and pistons which i can put on my old motor. but cheers anyway

Ahh, You'll be fine then. Go for it.
Sounds like you got a good deal on the motor too....

I did my first cage motor a few months back... Yes, needed a little help, but at the end of the day it is a process thing, and you'll be right.

R6 Kid has a great idea of taking photos etc. That's good.
In the old days we used to mark stuff and write it down... Not that I'm that old....