[milo]

I'm planning to replace my worn out cam chain on my 97' ZXR250/ZX2R.
Do i need any special tools? How tedious it can be?
Some said that i didn't need to remove the engine.
Some mechanic said you'll have to..

confused.

thanks.

 

[Stormdragon]

First question is: Are you sure it's worn? Usually it's the tensioners that need replacing, not the chain, and even then only after a lot of miles.
A new cam chain is normally a big job, requiring the engine to come out, and the crankcases to be split. It might be different for your bike, but you'd be the rare exception.

 

[milo]

I've checked the tensioner and it seems to be okay.
The tensioner has reached its limit to tension up
the cam chain.. does it mean that my cam chain elongated?

If it is, then a few of my friend said that I'll need a new cam chain

btw, its rattling sound might not very loud but compared
with other ZXR250, it makes worry much :frown:

 

[JimmyD]

A service manual will tell you what you need to do.

 

[Stormdragon]

There is a slipper, which is what the cam chain tensioner tensions against. The slipper presses against the chain. Just because 'a buddy' says the chain is worn, doesn't mean it is. There are service limits, which you will find in the service manual. Yes, you should have a service manual if you're going to work on the bike. You'll need to measure the distance of X amount of pins on the cam chain to determine if it's actually worn. If you've never worked on an engine before, I suggest you not make this your first project.

 

[WeBeToyz]

Yes, you should have a service manual if you're going to work on the bike.

If you've never worked on an engine before, I suggest you not make this your first project.

I couldn't agree more. The only way I'd make this my first project was if I had a mentor to walk me through the process, someone I trusted who knew what they were doing based on experience.

 

[milo]

i do have the service manual.. and it didn't say anything about how to replace a worn cam chain / timing chain. i've replaced a worn cam chain on other bike before. the worn-out cam chain measured the same length as new item. And after given some 5kilograms of weight, it appears only a slight different of 0.5mm thus measuring a cam chain sometimes is useless.

'slipper' is the plastic thing called 'cam chain guide' right? its still in order. no need to replace one.

nevermind, i'll do it on this weekend, if i have some spare time.