NRSPTR Posted January 10, 2015 Share Posted January 10, 2015 So I decided to replace my chain and sprockets today. I pulled of the front sprocket, and am noticing that the OEM sprocket has a rubber like material attached to both sides. I am replacing it with a JT steel sprocket (JTF339-16) which does not have this rubber material. Am I supposed to try to separate it off of the original and put it on the new one, or is it not a necessary piece??? Also, width of the OEM sprocket teeth is definitely wider in diameter than the JT. I just reconfirmed on JT's web site that the sprocket I ordered is for a 530 chain and it is. But it sure is concerning me that maybe it was intended for a 520 chain and incorrectly stamped. What do ya think??? Link to comment Share on other sites More sharing options...
Member Contributer TomP Posted January 10, 2015 Member Contributer Share Posted January 10, 2015 It's not required. Lots of people prefer the OEM sprocket because of the damping the rubber provides. Aftermarket sprockets don't have it (and I can't imagine how you'd re-use it from an OEM sprocket). Can't help you on the apparent size difference, sorry. Link to comment Share on other sites More sharing options...
Member Contributer Lorne Posted January 10, 2015 Member Contributer Share Posted January 10, 2015 That's why Honda charge more. The plain sprocket is noisier than the o/e rubber damper unit - I went with one on one of my VFRs. Dunno if you need to shim the plain sprocket, some of the old hands will have a tough or two. ;-P Lorne Link to comment Share on other sites More sharing options...
AllWeather Posted January 10, 2015 Share Posted January 10, 2015 This exactly why I use a genuine front sprocket when ever I change them out the rubber is bonded to the sprocket and can not be removed and re used it helps to quieten the chain/sprocket noise I won't use JT sprockets anymore after having to return 3 rear ones as they were out of round straight out of the bag They are stamped and quite badly finished The last set I bought were laser cut from a crowd in Australia called "Chain Gang" http://www.chaingangchainsandsprockets.com.au/ Link to comment Share on other sites More sharing options...
NRSPTR Posted January 10, 2015 Author Share Posted January 10, 2015 Thank you all for the feedback! Guess I'll eat the cost of the JT and order an OEM sprocket. Thanks again all! Link to comment Share on other sites More sharing options...
Auspanglish Posted January 10, 2015 Share Posted January 10, 2015 You just slap it on... I too suspect that my current rear sprocket by JT is slightly oh so slightly out of round... but should have same diameter Link to comment Share on other sites More sharing options...
Member Contributer FJ12Ryder Posted January 10, 2015 Member Contributer Share Posted January 10, 2015 I'd use it. I don't really think you'll notice the difference in noise between an aftermarket sprocket and OEM. Maybe if you're going really slow, have the stock exhaust, and lean your head down really close... Link to comment Share on other sites More sharing options...
Auspanglish Posted January 10, 2015 Share Posted January 10, 2015 You don't notice the difference in noise... but more than for noise I imagine it's for vibrations in the footpegs... I haven't really noticed this changed all that much either. Link to comment Share on other sites More sharing options...
NRSPTR Posted January 10, 2015 Author Share Posted January 10, 2015 You don't notice the difference in noise... but more than for noise I imagine it's for vibrations in the footpegs... I haven't really noticed this changed all that much either. I'd use it. I don't really think you'll notice the difference in noise between an aftermarket sprocket and OEM. Maybe if you're going really slow, have the stock exhaust, and lean your head down really close... If it were just the issue of not having the damper material, I'd probably use it. But the width difference just doesn't seem right to me. It's a good millimeter narrower and you can feel the sloppiness when you put it in the chain and shimmy it back and forth. A new sprocket shouldn't have "more" play in the chain than a worn one. The JT was only $16 so I will just trash it and chalk it up to a lesson learned. An OEM is on the way from Partzilla for $45. Thanks again to everyone for your input, I really appreciate it! Link to comment Share on other sites More sharing options...
Member Contributer expvet Posted January 10, 2015 Member Contributer Share Posted January 10, 2015 Smart move, with a time consuming job like having to remove your chain in order to redo the sproket removal it's not worth it. Better to have the peace of mind than the $16.00 in the pocket. Link to comment Share on other sites More sharing options...
Auspanglish Posted January 11, 2015 Share Posted January 11, 2015 I'd still try and return it for a refund... although that'll depend on the returns policy of the mob you bought it from. Link to comment Share on other sites More sharing options...
Member Contributer adeyren Posted January 11, 2015 Member Contributer Share Posted January 11, 2015 Just ordered a 16t front sprocket, should be here Mon. http://www.ebay.co.uk/itm/400795954297?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT Will measure the original and the new one see if theres a difference. Link to comment Share on other sites More sharing options...
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