Maintenance & Technical > KX500 Original

Steel-Sleeved Bore

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Kawasakifreak:
Hi,

I'm thinking about buying a KX500 which the owner states has been re-bored and a steel sleeve/liner pressed in a few years ago - it's running on it's 2nd standard piston & rings.

Is the seller hiding more serious damage to the engine which prevented him re-boring using Nikosil ?

Also, does a steel liner remove heat from the bore area as efficiently as Nikosil ?  Could steel liners increase the potential for piston seizures ?

Any advice greatfully received.

Cheers.

Polar-Bus:

--- Quote from: Kawasakifreak on November 23, 2010, 06:33:13 PM ---Hi,

I'm thinking about buying a KX500 which the owner states has been re-bored and a steel sleeve/liner pressed in a few years ago - it's running on it's 2nd standard piston & rings.

Is the seller hiding more serious damage to the engine which prevented him re-boring using Nikosil ?

Also, does a steel liner remove heat from the bore area as efficiently as Nikosil ?  Could steel liners increase the potential for piston seizures ?

Any advice greatfully received.

Cheers.

--- End quote ---

This is new to me... a "steel" liner ? To my knowledge all "pressed in" replacement liners are fabricated from Cast Iron ?

BDI:
The biggest diff is the warm up time. If your bike has a sleeve in it you have to let it warm up good before you ride it do to the diff expansion rates of the sleeve and piston or the bike will cold seize.

Hillclimb#42:
Most people generally put a sleeve in because its cheaper. Most cylinders can be repaired and re-nikosil plated, but costs more. Nikosil lasts longer and disipates heat better. Using nikosil also has the advantage of using stock piston and rebuild kits. Hondas use sleeves and can be bored to correct imperfections, but have the over bore piston sizes readily available. Not sure how you get over bore Kawi pistons. I'm sure its being done, and would be what you need, if its already on the second set of piston and rings in that sleeve. The sleeve vs nikosil has been discussed at length on here in the past. ( Search function) From what I remember, the nikosil cylinders let you have a tighter tolerance between piston and cylinder, where the sleeved cylinders need a little more room for expansion/contraction, which should be fine as far as seizures, as long as the shop goes by the proper clearances.

BDI:
You have to let a sleeved bike warm up good no matter the machine work, if you don't you will scuff the piston. You are right about the search function, there is enough info on here about sleeves to choke a horse.

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