YFZ cylinder lining

[cletusEX]

Are YFZ cylinders nikasil lined? And has anyone heard of a problem with a bearing failing in the bottom end? if so what bearing is it? Thanks

[JH Racing]

yes they are nikasil. I have heard of the counterbalancer bearing going bad. The main problem I have seen is shift forks bending.

They are nickasil, and the problem with the crank is that there was not getting proper lubrication due to a misalignment. Very rare though.

[K_Fulk]

Is the sleeve aluminum or steel?

[Kennethyfz450]

Originally posted by sinister450
They are nickasil, and the problem with the crank is that there was not getting proper lubrication due to a misalignment. Very rare though.

alluminum

[sleeveslave]

Originally posted by K_Fulk
Is the sleeve aluminum or steel?

There is no sleeve in the cylinder. The cylinder itself is plated.

[Kennethyfz450]

Originally posted by sleeveslave
There is no sleeve in the cylinder. The cylinder itself is plated.

well good day ....

their is a sleeve... lol

oh well...

you can contact esr and they sale steel sleeves cheaper then you can have your sleeve board and recoated....

i think they might even do some type of core exchange with you... but the only way to fint that out is by contracting them..

[sleeveslave]

Originally posted by Kennethyfz450
well good day ....

their is a sleeve... lol

oh well...

you can contact esr and they sale steel sleeves cheaper then you can have your sleeve board and recoated....

i think they might even do some type of core exchange with you... but the only way to fint that out is by contracting them..

With all due respect, the YFZ cylinder is a solid cast aluminum with a nickel-silicon-carbide plate.

You can install aftermarket sleeves for standard bore or for big bore application, and those sleeves can be made from aluminum or cast iron (sleeves are not steel).

Also, the one thing you don't want to do is to plate a cast iron sleeve. There is nothing to be gained by doing so and it does not solve any problem(s) the aftermarket companies think they have.

Tech Staff
Northwest Sleeve

[K_Fulk]

Thanks for the info.

[speedfreaksguy]

Originally posted by Kennethyfz450


you can contact esr and they sale steel sleeves cheaper then you can have your sleeve board and recoated....



True, the price of a sleeve is cheaper than the price of replating, but unless you can install the sleeve yourself, resleeving will cost more.

Originally posted by sleeveslave
With all due respect, the YFZ cylinder is a solid cast aluminum with a nickel-silicon-carbide plate.

You can install aftermarket sleeves for standard bore or for big bore application, and those sleeves can be made from aluminum or cast iron (sleeves are not steel).

Also, the one thing you don't want to do is to plate a cast iron sleeve. There is nothing to be gained by doing so and it does not solve any problem(s) the aftermarket companies think they have.

Tech Staff
Northwest Sleeve

EXACTLY, bottom line they are Nickesil.

[Kennethyfz450]

Originally posted by sleeveslave
With all due respect, the YFZ cylinder is a solid cast aluminum with a nickel-silicon-carbide plate.

You can install aftermarket sleeves for standard bore or for big bore application, and those sleeves can be made from aluminum or cast iron (sleeves are not steel).

Also, the one thing you don't want to do is to plate a cast iron sleeve. There is nothing to be gained by doing so and it does not solve any problem(s) the aftermarket companies think they have.

Tech Staff
Northwest Sleeve

You could be right???:confused: when you bore your stock sleeve you have to recoat it.... if you buy a STEEL sleeve from esr you dont have to...

it may not be steel but that is what esr said... check it out at yfzcentral.com click on esr and find the thread about the 480 kits for 3?? dollars??

anyhow you could be right or i could have been misunderstanding something .. who knows:cool:

[sleeveslave]

Originally posted by Kennethyfz450
You could be right???:confused: when you bore your stock sleeve you have to recoat it.... if you buy a STEEL sleeve from esr you dont have to...

it may not be steel but that is what esr said... check it out at yfzcentral.com click on esr and find the thread about the 480 kits for 3?? dollars??

anyhow you could be right or i could have been misunderstanding something .. who knows:cool:

People who know better often refer to sleeves as "steel"... that doesn't make it so.

You could certainly make one from steel, but steel does not have the properties you would want to use inside the bore of a cylinder. All of the powersports manufacturers use various grades of cast iron. We use Class 50, the others Class 40 and occassionally ductile--but no steel.

As for the 450, you need to trust the pro's just a little bit :cool:
This is our business... and we're not in it to mislead people. The cylinder is entirely cast aluminum--one piece, no sleeve. And if you bore out or strip the plating from the aluminum you either have to replate it or install a sleeve.

Tech Staff
Northwest Sleeve

[hatch440ex]

What he said. :cool:

[Kennethyfz450]

The big bore kits are now available. It's a 97mm bore 12.5:1. Prices:

Piston kit $159
Nikasil $250
(or) Steel sleeve $150
Gasket kit $38


That means you can get the HP up for as low as $347 for the whole kit!

Here's how it works choose either nikasil $250 or steel sleeve $150 and add the rest up (nikasil is $447) and Steel sleeve is $347. We will charge you an additional $175 core charge, when we recieve your cylinder we will credit you back -$175, or you can send us your cylinder first and avoid the core charge.

PS You can order these kits and they will ship the same day!!!!!!


ESR is offering another route which is to go with a
steel sleeve that requires no replating !!
he may not have meant steel sleeve but that is what he said.
i just want to clear up that i didnt spread false information..


quoted right off yfzcentral!!
nuff saidsteel sleeve

[speedfreaksguy]

Originally posted by sleeveslave
People who know better often refer to sleeves as "steel"... that doesn't make it so.