ninjette.org

Go Back   ninjette.org > 2008 - 2012 Ninja 250R > 2008 - 2012 Ninja 250R Tech Talk

Notices

Reply
 
Thread Tools
Old July 26th, 2019, 07:00 PM   #1
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
A shocking tale!

I had couple extra rear shocks laying around, so made comparison:



#1 ‘07 EX500 shock 45014-1365, 312mm length, is exact same as #2 '86-87 1st-gen 250 shock with 0.15mm thicker spring. Not significantly stiffer enough for +90lb bike.

#2 ‘86-87 EX250E 1st-gen shock 45014-1339, 312mm. Both this and EX500 shock have rotating-collar preload-adjuster which also makes it easy to replace spring.

#3 ‘88-07 EX250F pre-gen shock 45014-1406, 315mm, smallest wire-diameter softest spring. Non-adjustable in every way.

#4 ‘08-12 EX250J new-gen shock 45014-0234-37S, 320mm, stiffest stock spring, gets 5-way pre-load adjuster

#5 K-tech Razor-R shock, independent preload & length adjustments (set to 320mm). Also separate rebound & compression adjustment knobs

#6 Ohlins shock from GSX-R1000. Adds about 4-lbs extra weight. Not sure it's any better than Razor-R. Lap-times not any different in practice @ Thunderhill today.

Last futzed with by DannoXYZ; September 11th, 2019 at 06:31 PM.
DannoXYZ is offline   Reply With Quote




Old July 26th, 2019, 07:14 PM   #2
Snake
ninjette.org certified postwhore
 
Snake's Avatar
 
Name: Rick
Location: Alexandria, Louisiana
Join Date: Jan 2009

Motorcycle(s): 05 Blue Ninja 250

Posts: Too much.
MOTY - 2017, MOTM - Jan '19, Oct '16, May '14
I’m not sure which one is the best but I like #5.
Snake is offline   Reply With Quote


Old July 27th, 2019, 10:10 AM   #3
Alex
ninjette.org dude
 
Alex's Avatar
 
Name: 1 guess :-)
Location: SF Bay Area
Join Date: Jun 2008

Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE, '15 CRF110F, '13 TT-R50E

Posts: Too much.
Blog Entries: 7
They are shocking! (or would be in motion, at least)
__________________________________________________
Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org

ninjette.org Terms of Service

Shopping for motorcycle parts or equipment? Come here first.

The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)
Alex is offline   Reply With Quote


Old July 27th, 2019, 06:13 PM   #4
Snake
ninjette.org certified postwhore
 
Snake's Avatar
 
Name: Rick
Location: Alexandria, Louisiana
Join Date: Jan 2009

Motorcycle(s): 05 Blue Ninja 250

Posts: Too much.
MOTY - 2017, MOTM - Jan '19, Oct '16, May '14
So which would you recommend?
Snake is offline   Reply With Quote


Old July 27th, 2019, 06:52 PM   #5
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
Quote:
Originally Posted by Snake View Post
So which would you recommend?
I like K-Tech Razor-R. I had ordered it with specs for my weight and riding style and it needed minimal adjustments on track. Asked for some fine-tuning help from Dave Moss in beginning and he fiddled with it a little and it's been perfect.

I prefer a softer suspension for my riding style, which is not as aggressive as others. I don't toss it into corners or muscle it around.

The Ohlins I had rebuilt last year with lower-weight oil. Even so, I've had to back off low & hi compresion-damping to minimal levels. It was causing some traction issues with skipping off tops of bumps. I'll still need to change to softer spring as this shock was designed for 150-lb heavier bike. It also has hydraulic preload adjuster which I think is kinda gimmicky.

Putting Razor-R back on tonight. Back-end is pretty much perfect with it and I've never lost rear. Even whacking throttle to 100% while leaned over in middle of T2©Thunderhill only pushed front-end. Might try 120 front tyre, but more than likely, I'll downsize 150 rear tyre.
DannoXYZ is offline   Reply With Quote


1 out of 1 members found this post helpful.
Old January 4th, 2020, 04:43 PM   #6
InvisiBill
EX500 full of EX250 parts
 
InvisiBill's Avatar
 
Name: Bill
Location: Grand Rapids-ish, MI
Join Date: Jul 2012

Motorcycle(s): '18 Ninja 400 • '09 Ninja 500R (selling) • '98 VFR800 (project) • '85 Vulcan VN700 (sold)

Posts: A lot.
Blog Entries: 1
MOTM - Aug '15
I just wanted to point out that the EX500 spring has more coils, so it's actually softer than the PreGen spring. The numbers I've seen are 300lb/in compared to 440lb/in.

I don't have the means to measure them precisely, but while I had the springs off, I used the fancy "stand on it and see how much it squishes" method. The EX500 spring is definitely much softer. This is supported by the SV650 shock (with a spring rate similar to the PreGen's) being a very noticeable upgrade that a number of EX500 riders have done.

It doesn't make sense for the heavier EX500 to have a softer spring, but a lot of Kaw's bikes have way-off spring rates. I've seen models with the front and rear sprung for 100lb and 300lb - not at all matched, and neither one near an average rider's weight. I've come to the conclusion that they don't put much thought into their budget bikes' spring rates (or just ignore those calculations when they pick which part they actually put into the bike).
__________________________________________________

*** Unregistered, I'm not your mom and I'm not paying for your parts, so do whatever you want with your own bike. ***
InvisiBill is offline   Reply With Quote


1 out of 1 members found this post helpful.
Old January 5th, 2020, 06:40 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
I wonder if it can also be mistake in converting between units? Imperial vs. metric.

Case in point, I ordered some silk pants from Hong Kong and sent in measurements as centimetres. They assumed it was inches converted it again into centimetres and I ended up with pants that were made for 400-lb giant!!!

Last futzed with by DannoXYZ; January 6th, 2020 at 02:24 AM.
DannoXYZ is offline   Reply With Quote


Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
[visordown.com] - Motorcyclist's SHOCKING near miss with LAMBorgini Ninjette Newsbot Motorcycling News 0 May 8th, 2017 03:12 AM
[visordown.com] - Shocking crash caught on helmet camera Ninjette Newsbot Motorcycling News 0 March 9th, 2017 03:50 AM
Most shocking! Girl meets concrete. EthioKnight Videos 23 May 15th, 2012 09:38 AM
[hell for leather] - RideApart 4: a shocking truth Ninjette Newsbot Motorcycling News 0 May 7th, 2012 05:40 PM
[2fiddy.com] - Shocking Ninja 250 Ninjette Newsbot Motorcycling News 0 September 30th, 2008 02:57 PM


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 07:44 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.