Nikasil
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Zukiscott is correct! Any bore at all requires the cylinder be re-nicasiled.
The 105 bore with a steel liner/sleeve is not exactly something I would recomend. In order for the sleace to maintain any wall thickness, it must intrude on the water passages. Now you have a design with worse heat transfer properties[sleaved cylinder] than stock, with smaller water passages as well. This is likely to cause heat issues inside the cylinder. I've not seen the cylinder, so I can't tell you if the head would seal well or not, but there is no reason that it won't seal stricktly due to the bore. The fact that it's a sleave is not an issue, most ATV motors are done that way. It will not hold the bore as long as the nicasiled cylinder, but it should not wear any faster than most ATV motors either.
The 105 bore with a steel liner/sleeve is not exactly something I would recomend. In order for the sleace to maintain any wall thickness, it must intrude on the water passages. Now you have a design with worse heat transfer properties[sleaved cylinder] than stock, with smaller water passages as well. This is likely to cause heat issues inside the cylinder. I've not seen the cylinder, so I can't tell you if the head would seal well or not, but there is no reason that it won't seal stricktly due to the bore. The fact that it's a sleave is not an issue, most ATV motors are done that way. It will not hold the bore as long as the nicasiled cylinder, but it should not wear any faster than most ATV motors either.
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