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Post by bultaco on Dec 19, 2008 3:39:31 GMT -8
In my search to replace the 15/45s on my 99 XT600E I discovered Yamaha changed the countershaft sprocket design when they added electric start, from a six spline narrow sprocket to a fine 22 spline sprocket with a wide shoulder. JT list the same part number for the 1990 to 1998 XT600 countershaft sprocket as JTF577. the sprockets I presently have on the bike are a JTF577.14T and a JTR857.47 giving me a ratio of 3.21 to 1 over the stock 3.00 to 1. this appears to be the lowest ratio available having searched every year and combination of XT/TT I could find. a lower ratio requires some ingenuity and a trip to your local machine shop.  
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Post by bultaco on Dec 20, 2008 4:41:55 GMT -8
99 Europen XT600 Rear Sprocket Yamaha Part # 4DN-25445-20 - 45 tooth.
1995 Part # is the same.
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Post by bultaco on Dec 20, 2008 4:44:22 GMT -8
Have been told the largest rear sprocket listed by Sunstar for the 95 XT600 is 45 tooth.
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Post by bultaco on Dec 20, 2008 4:52:01 GMT -8
Don't trust BVP sprocket part numbers. I ordered a sprocket and discovered they list the correct part numbers on the wrong parts, for example, the BVP countershaft sprocket listed for 1990 and later XT600s is not the proper 22 spline type sprocket but the old 6 spline design from the pre 90s XT600s. parts people have mentioned frustration with BVP parts.
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Post by bultaco on Dec 20, 2008 5:00:18 GMT -8
JT Sprocketswww.jtsprockets.com/Suppliers for JT Sprockets.
Motovan 800-363-0808
Steen Hansen Racing Products. 780-466-8653
BSL 418-862-6423 (NOTE: New address for Bike Alert Inc. replace 1465 Trae Lane with 2230 Skyview Drive)
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Post by bultaco on Mar 10, 2012 18:30:52 GMT -8
(UPDATE) As of March 2012 The JT 14/47 sprockets are no longer listed in Canadian supplier catalogs and have to be special ordered. (stock 15/45s may still be available) April Ferguson at Bike Alert in the U.S. was nice enough to make an exception and sold the 14/47s directly to me ! :-)
See full details below
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Post by Jens Eskildsen on Mar 13, 2012 9:53:37 GMT -8
www.off-the-road.de have up to a 50 tooth rear sprocket. Also "PBI" makes sprockets as small as 13 for our bikes. This gives you plenty of options for really low gearing.
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Post by bultaco on Mar 14, 2012 1:00:12 GMT -8
Thanks for the heads up Jens, PBI looks promising I'll give them a call.
A link to the PBI Sprocket website and some info.pbisprockets.com/Home_Page.htmlPBI Sprockets. manufactured by Chris Products Inc. Oregon.
email: info@chrisproducts.com
Ph 503-645-6500 | 800-628-1256 | 503-645-8500 fax
Monday to Friday 7am to 4pm
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Post by bultaco on Mar 14, 2012 16:18:45 GMT -8
Fired off an email to PBI and received this response to sprockets for a 1995 XT600E
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Post by bultaco on Mar 25, 2012 18:29:45 GMT -8
New chain and sprockets.Spend a few extra bucks so you don't end up with a ►Cheap Chain                Note: UPS do not accept cash
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