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Old February 21st, 2017, 02:54 PM   #1
Cra1g
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Rear 42T Sprocket from JT

Couldn't find a specific model number for a rear 42T sprocket from JT on the wiki, so I searched Amazon and it says this one is compatible with my '07:

https://www.amazon.com/JT-Sprockets-...dp/B000GTTUCE/

I don't fully doubt Amazon, but just want to confirm that this is correct.
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Old February 21st, 2017, 03:14 PM   #2
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If you go to JT's site, you can find the correct sprockets that are available:

http://www.jtsprockets.com/catalogue
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Old February 21st, 2017, 05:21 PM   #3
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Quote:
Originally Posted by Triple Jim View Post
If you go to JT's site, you can find the correct sprockets that are available:

http://www.jtsprockets.com/catalogue
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Old February 22nd, 2017, 01:47 PM   #4
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I guess I should follow up by also asking if there are any good tutorials for replacing the rear sprocket? I followed the one on the wiki to replace the front sprocket and it was great, but they don't seem to have one on the rear sprocket..
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Old February 22nd, 2017, 02:03 PM   #5
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Once you remove the rear wheel, it's pretty self explanatory.
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Old February 22nd, 2017, 02:42 PM   #6
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Quote:
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Once you remove the rear wheel, it's pretty self explanatory.
Do the sprocket bolts need torqued to a specific value?
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Old February 22nd, 2017, 03:15 PM   #7
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Quote:
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Do the sprocket bolts need torqued to a specific value?
Always a good idea.

Rear wheel removal - http://faq.ninja250.org/wiki/Removin...the_rear_wheel

Torque values - http://faq.ninja250.org/torque/ex250f/ - 67 Nm or 49.41 Foot Pounds for the rear sprocket bolts
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Old February 22nd, 2017, 03:27 PM   #8
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You got a torque wrench that'll do two places past the decimal point, Jay?
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Old February 22nd, 2017, 03:37 PM   #9
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You got a torque wrench that'll do two places past the decimal point, Jay?
Ha - no, but the actual conversion is 49.416664003 - so I was rounding...
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Old February 22nd, 2017, 03:54 PM   #10
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Old February 23rd, 2017, 05:54 PM   #11
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Use a propane torch to heat the bolts, this will soften the threadlocker that will otherwise make the bolts a real pain to remove. While you're in there use cut up plastic from milk jugs to shim the cush drive to reduce driveline lash.
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