KRS Aluminum Big Bore Kit?

DorkoElite303 · Post by **DorkoElite303** » Mon Dec 29, 2008 8:31 pm

Anyone have any reviews on these Aluminum kits???

If you ride one, how do you like it? Other peoples opinion on it?

Should I just stick with a cast iron?

Kenny_McCormic · Post by **Kenny_McCormic** » Mon Dec 29, 2008 9:39 pm

Iron lined AL>solid iron>solid AL

veedubh20 · Post by **veedubh20** » Mon Dec 29, 2008 10:30 pm

trash bore!

just buy malossi mhr bore got dual rings...

Wheelman-111 · Post by **Wheelman-111** » Tue Dec 30, 2008 12:58 pm

Greetings:

I see a KRH bore kit on Daywot's store. I have NO experience with this specific setup. The price is attractive. The story reads that this is a Nikasil-lined bore. I do know a thing or two about that.

Compared to many other alloys, Aluminum is a great heat condutor. That's a useful in a high-output engine application, as it runs cooler than an iron sleeve. However raw Al has poor abrasion resistance, making for a short service life as a cylinder.

In 1967 a patent was granted for a hard Nickel/Silicon - Nikasil - coating plated inside cylinders. This stuff wears longer than iron. It reduces friction - and associated parasitic power loss - considerably. Furthermore the thinness of the lining does not interfere with the cooling properties of the aluminum. Thus the engine can be tuned for higher output with less risk of a meltdown.

Read all about it: http://en.wikipedia.org/wiki/Nikasil

One downside is that a Nikasil cylinder cannot easily be rebored or even honed in the event of a piston-related catastrophe. Another is that a poor piston/cylinder size match will not last very long, and cannot be adjusted by boring the cylinder to match an oversize piston.

Kenny_McCormic · Post by **Kenny_McCormic** » Tue Dec 30, 2008 1:18 pm

Bore and replate? I know there are shops that could probably do it.

Wheelman-111 · Post by **Wheelman-111** » Tue Dec 30, 2008 2:04 pm

Greetings:

Several shops popped up for a Google search of "Nikasil Replate". Easily done for $165-$195./single cylinder.

DorkoElite303 · Post by **DorkoElite303** » Tue Dec 30, 2008 9:44 pm

Anyone have any experience???

burnt_toast · Post by **burnt_toast** » Tue Dec 30, 2008 10:46 pm

No experiance with the KRS, but I've ran Airsal T6 aluminum 70cc in my jog style bikes, three of these bores in total and had good success with each setup but one, where piston clip cause failure.

Besides that, aluminum bores do run much cooler, are lighter and can be pretty mean when ported.

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KRS Aluminum Big Bore Kit?

KRS Aluminum Big Bore Kit?

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