ninjette.org

Go Back   ninjette.org > 1986 - 2007 Ninja 250R > 1986 - 2007 Ninja 250R Tech Talk

Notices

Reply
 
Thread Tools
Old May 31st, 2019, 05:44 AM   #1
Theorist
ninjette.org member
 
Name: Eric
Location: MA
Join Date: May 2019

Motorcycle(s): 2005 250

Posts: 39
16 tooth front sprocket -- Anyone with personal experience?

I'd really like to hear from anyone who has used or tried to use a 16 tooth front sprocket. Please reply with any helpful experience you might have. I'm particularly concerned about chain length and how much aluminum I need to grind away from the inside of the front sprocket cover.
Theorist is offline   Reply With Quote




Old May 31st, 2019, 03:19 PM   #2
DannoXYZ
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
Hi, I have 16th sprocket on both my pregen and newgen street bikes. Had to leave sprocket-cover off on pregen as it's too tight of a fit for chain to clear. I may grind clearance channel on inside of sprocket-cover and see if it'll go back on.
DannoXYZ is offline   Reply With Quote


Old June 1st, 2019, 01:05 AM   #3
Theorist
ninjette.org member
 
Name: Eric
Location: MA
Join Date: May 2019

Motorcycle(s): 2005 250

Posts: 39
Thank you. Did you use it with a 45 tooth rear sprocket and a new 106 link chain? If not, do you believe to would fit?

I did some calculations and work on the sprocket cover clearance but won't know until it arrives and I install it.

Geometric calculations indicate the 16 tooth sprocket needs 5.015 mm more radial space than the 14 tooth sprocket. I measured a 5mm thickness of pages from a magazine headed for recycling. After cutting a strip of these pages about 2cm wide, I was able to place it around the chain on the 14 tooth front sprocket and then_barely_ fit the front sprocket cover on over it. I used the splatter marks of the grime flung from the chain to the sprocket cover to mark, score, the relevant areas on the sprocket cover. Using a Dremel I removed 1-2mm of aluminum from the inside of the cover. Then I used some play do to 'see' under the cover. I pressed the play do on the inside cover, pressed the cover into place over the sprocket and chain to create a mould I could measure. Moving around, I couldn't find any place with less than 6-7 mm of clearance. I removed another 1mm of aluminum where there wasn't at least 7 mm of clearance around the chain and 14 tooth sprocket, so hopefully at least 2mm clearance around the chain and 16 tooth sprocket.

When the 16 tooth sprocket arrives I'll try to mount the modified sprocket cover over it and listen carefully for any new noises as I ride. I'll also look for any marks suggesting any contact been the chain and sprockets cover the next few times I clean and lube the chain. I'm most concerned about grinding debris between the chain and sprockets cover, so I'll be looking for and signs of that.

Last futzed with by Theorist; June 1st, 2019 at 10:54 AM.
Theorist is offline   Reply With Quote


Old June 2nd, 2019, 09:59 AM   #4
DannoXYZ
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
Yes, stock 45t in rear. I just slide rear wheel forward 5mm using adjusters on swingarm.
DannoXYZ is offline   Reply With Quote


Old July 5th, 2019, 09:32 AM   #5
Theorist
ninjette.org member
 
Name: Eric
Location: MA
Join Date: May 2019

Motorcycle(s): 2005 250

Posts: 39
In case anyone else wants to try using a 16 tooth front sprocket and the front sprocket cover, here's my experience.

I first ran them together after grinding away some aluminum from the inside of the sprocket cover to give the chain more clearance on the larger sprocket. I then removed the cover and found that the chain had rubbed against and eaten into the sprocket cover at the front and especially at the bottom, between 7mm and 21mm from the edge facing the transmission. I ground more aluminum away, so that a straight edge over these areas left a 2mm gap. After riding another 300 miles, the chain is no longer contacting or marring the sprocket cover. I'll inspect the inside of the sprocket cover again when I adjust or replace the chain.
Theorist is offline   Reply With Quote


Old July 5th, 2019, 11:22 AM   #6
Triple Jim
Guy Who Enjoys Riding
 
Triple Jim's Avatar
 
Name: Jim
Location: North Carolina
Join Date: Jul 2016

Motorcycle(s): Ninja 250

Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
Thank you for that. Have you found any evidence of contact on anything other than the cover?
Triple Jim is online now   Reply With Quote


Old July 31st, 2019, 08:53 PM   #7
DannoXYZ
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
Nothing else rubs except for inside of sprocket cover. I found easier solution to 16t on pre-gen is to just use sprocket-cover from ‘08-12 new-gen bikes. No grinding needed whereas I couldn’t even put on pre-gen cover due to too much interference.



Yeah, those are Ninja 300 rearsets too!
DannoXYZ is offline   Reply With Quote


Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
15 Tooth Front Sprocket is My Bitch Please look at pics reroka 2008 - 2012 Ninja 250R Tech Talk 20 June 12th, 2014 05:25 AM
15 tooth Front sprocket reroka 2008 - 2012 Ninja 250R Tech Talk 16 April 24th, 2014 01:07 PM
15 tooth front sprocket sidekick10121 1986 - 2007 Ninja 250R Tech Talk 3 March 16th, 2014 01:04 PM
13 Tooth Front Sprocket from PitBull 1ER6F Motorcycle-related 0 April 23rd, 2013 09:32 PM
15 Tooth Front Sprocket FerociousNINJA 2008 - 2012 Ninja 250R Tech Talk 5 September 14th, 2010 05:21 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Motorcycle Safety Foundation

All times are GMT -7. The time now is 10:27 AM.


Website uptime monitoring Host-tracker.com
Powered by vBulletin®
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Except where otherwise noted, all site contents are © Copyright 2022 ninjette.org, All rights reserved.