July 10th, 2017, 07:22 AM | #1 |
ninjette.org member
Name: S n 0 r r £
Location: Stjoerdal, Norway (San Diego, CA, USA, 2015-2016 , Bielefeld, Nordrhein Westfalen,Germany 2021-'22)
Join Date: Sep 2012 Motorcycle(s): TMZ 5.952 "Tula" 200, Ninja 250 -Special ed. '11, ZZR 1400 (ZX14), Honda CB 1100 F Super Bol D'or Posts: 143
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200 miles with old rear sprocket - damage done?
About 10 days ago i showed up at Ride in Trondheim, Norway, to have the 250 serviced. I was told that the mechanic had become ill, and that they could unfortunately not do the service on the bike that had been agreed upon earlier.
I should use it for a trip to Østersund, Sweden, a few days later, so instead I made an agreement with a workshop there, CJ Motorteknik. I had bought a new chain and the front and rear sprockets from a 3rd company in Norway. After a couple of hours they called from CJ Motorteknik and told that the rear sprocket did not fit, so it was decided to change the front sprocket (smallest diameter) and the chain, but keep the old rear sprocket. I have always heard that both sprockets as well as the chain should be changed at the same time, not for old parts to damage new ones. Since there was no chance in getting the right rear sprocket during my few days in Sweden, I drove approximately 300 kilometers (180 miles) with the combination of the old rear sprocket and a new chain and front sprocket. The old chain and front sprocket were in bad shape. Should I change the old rear sprocket ASAP, or is it likely that the damage is done, anyway? There is little, if any, visible wear on the rear sprocket. Should I rather just run the bike with the present mix of new chain and front sprocket and the old rear sprocket, or not..? Thanks for any advice, and sorry if similar cases have already been debated here.. |
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July 10th, 2017, 08:34 AM | #2 |
ninjette.org sage
Name: Aaron
Location: Winder, GA
Join Date: Jun 2012 Motorcycle(s): 2013 Ninja 300 Posts: 718
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It's probably not a big deal to run the old rear sprocket if (and I stress if) it's truly in good shape, but I would go ahead and replace it for peace of mind, especially if you were already going to have it done.
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July 10th, 2017, 09:16 AM | #3 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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You didn't hurt anything in that distance. I've changed a worn chain and kept the old rear sprocket many times, if it had little or no visible wear. Some sprockets can be turned over so the backs of the teeth become the drive surfaces, and it's essentially new again.
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2 out of 2 members found this post helpful. |
July 11th, 2017, 09:09 AM | #4 |
Certifiable nontundrum
Name: Harper
Location: NC Milkshake stand
Join Date: Mar 2013 Motorcycle(s): 2013 SE NINJA 300 Posts: Too much.
MOTM - Sep '13, Sep '16
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Should be fine
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August 2nd, 2019, 12:02 AM | #5 | |
ninjette.org member
Name: S n 0 r r £
Location: Stjoerdal, Norway (San Diego, CA, USA, 2015-2016 , Bielefeld, Nordrhein Westfalen,Germany 2021-'22)
Join Date: Sep 2012 Motorcycle(s): TMZ 5.952 "Tula" 200, Ninja 250 -Special ed. '11, ZZR 1400 (ZX14), Honda CB 1100 F Super Bol D'or Posts: 143
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Quote:
So, I'll not combine a new chain with old parts another time.. |
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August 2nd, 2019, 12:47 AM | #6 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Yes, couple hundred KM is fine, but riding for years with worn rear-sprocket accelerated wear on your new chain and front-sprocket.
One trick that could have been done when CJ Motorteknik called about new rear-sprocket not fitting is to flip old sprocket inside-out. This places chain-load on other unworn side of teeth. Effectively doubling sprocket life. |
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August 2nd, 2019, 05:53 AM | #7 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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August 29th, 2019, 02:31 PM | #8 |
ninjette.org member
Name: Hex
Location: USA
Join Date: Aug 2019 Motorcycle(s): EX250F, 1960 T100A, GPz900R, 74 XLCH, etc. Posts: 23
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August 29th, 2019, 04:34 PM | #9 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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August 29th, 2019, 05:18 PM | #10 |
ninjette.org member
Name: Hex
Location: USA
Join Date: Aug 2019 Motorcycle(s): EX250F, 1960 T100A, GPz900R, 74 XLCH, etc. Posts: 23
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Same reason. Accelerated wear and premature failure. They don't wear on just one side.
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