On a diesel forum I read about a guy whose bike was smoking and he found out that it was a very bad crosshatching job that caused it.

Is the crosshatching as important on a two-stroke ?

Should you crosshatch it every time you have it opened ?

Should the hatching be in a 45degree angle as described below or another angle, to retain more 2-T oil on the barrel/cylinder ?

http://www.hastingsmfg.com/ServiceTips/cylinder_bore_refinishing.htm
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

The crosshatching is to hold an oil film, and is needed. When everything is up to temperature the piston has almost no clearance whatsoever in the bore and purely relies on a quality stroker oil to keep the aluminium from touching the plating. As soon as the film is broken it'll nip up.

It should be somewhere in the region of 60 degree.

When I pull a motor apart I will stick a ball hone up and down the cylinder a few strokes. I do this in my parts washer while pouring kero on it. This helps wash all the particles out and cleans up any lacquer on the bore allowing the rings to seal perfectly on the rebuilt motor.

Don't ever use a 3 stone hone on a stroker or you'll chip the plating off as the stones catch in the ports.

My ball hones are always slightly smaller than the bore (As Eric Gorr recommends on his website) so you're only tickling the wall.

Matt@TYGA wrote:My ball hones are always slightly smaller than the bore so you're only tickling the wall.

Man that sounds like some kind of sexual deviancy!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Sorry Dave, I can't help it.....I've known Granty for way too long and his deviant ways have rubbed off on me..........

Ere... we've been blotto in many a seedy joint, but I don't recall anything ever rubbing off on you that was attached to me, so watch it!
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Andy.
NSR-WORLD.COM

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