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[QUOTE="jaguar, post: 513068, member: 19340"]
see [url]http://www.mxsouth.com/keihin/keijetneedle.htm[/url] 
From R1173L the "R" is the Keihin part #, the "11" is the taper in degrees which is 1degree 15minutes, the "73" is the diameter at the fattest part which translates to option P 2.745mm, and "L" is the L1 length (top needle clip notch down to where the needle has a width of 2.515)) on the upper diagram of the needle which the chart doesn't list but it could be a length between the listed "K" (38.6mm) and "N"(39.95mm).
Theres no direct cross to your stock needle. the Kawasaki R1174L would be the next leaner. The Keihin # of the next two leaner ones are N427-48BGP and N427-48BHP which give the next two longer L1 lengths which is like lowering the needle to make it run leaner.
But I think you should just leave the needle alone and lube the engine normally instead of going 50:1 which is just too much. I run 35:1 semi-synthetic Motul oil and never foul a plug. When you put in less oil then your engine is actually sucking in more gas which means you just jetted it richer. Go to 35:1. You'll like it.
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