Upgraded the Minja - ZX6R Forum
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post #1 of 5 Old 03-29-2017, 03:43 PM Thread Starter
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Upgraded the Minja

So I still have the Ninja 250 I started on, I call it the Minja (mini ninja). My wife rides it, and I've taken it out when I either had my bike in the shop getting tires or when I lost my key.

So I can rail on this bike pretty hard, but the original suspension is EXTREMELY soft. Like, bouncing up and down over rough pavement, lots of movement when cornering aggressively, and it jumps when upshifting. So I thought we should upgrade the suspension. The other day when she was riding she had it leaned over and it started rocking on her due to the really bad damping on the rear shock, so SHE agreed we should upgrade the suspension.

I got Sonic Springs using the rate calculator either they or RaceTech provides, and I bought RaceTech Gold Valve Emulators, and I picked up an EX250J shock (08+ 250) for the rear.

Last Saturday, I started the project. The rear shock replacement was cake. 20 min, two bolts, on and off.

For the front, I pulled the forks completely off the bike, cleaned them, replaced the fork seals (one was leaking), and reassembled with the new springs, valves, and spacers for correct preload. While I had the fairings off I decided to do some other maintenance. I cleaned the airbox, cleaned the entire engine and transmission housing of road grime and leaked oil gunk, and adjusted the valve clearances.

It rides SOO much better. I can clutchless shift through the first 3 or 4 gears with the throttle pinned and it goes like it's on a guide rail. No more bouncing or floating, it brakes better, corners better. Well worth the price of the parts.
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post #2 of 5 Old 03-29-2017, 05:18 PM
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Nice! So I'm guessing it rides more like and '08+ 250R now?

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post #3 of 5 Old 03-29-2017, 05:55 PM
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The right springs are the foundation of good suspension....

Hopefully the improved set-up works as well for your spouse?

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #4 of 5 Old 03-30-2017, 08:07 AM Thread Starter
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Quote:
Originally Posted by Strider View Post
Nice! So I'm guessing it rides more like and '08+ 250R now?
Yeah, probably, though I haven't ridden one.

Quote:
Originally Posted by RJ2112 View Post
The right springs are the foundation of good suspension....

Hopefully the improved set-up works as well for your spouse?
When I calculated the spring rate, I used her weight for the variables, so the springs should be set up for her. Even if it's not set for me for racing, I can still tell the bike is so much better off.

She rode last night and said she absolutely loved the new setup.
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post #5 of 5 Old 03-30-2017, 09:55 AM
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My FZ6 had terrible springs, from the factory. The rear was way too soft, and under damped.... the front had progressive springs that were much too soft on both rates. It never rode on the softer part, so the front had already consumed about 70% of the travel, just sitting on the bike.

I dropped in linear rate .95 Kg/mm fork springs and mounted up a fully adjustable Ohlins remote reservoir shock..... the difference was immense. The chassis was completely transformed, because it just did what I asked it to instead of all sorts of random stuff that mostly ended up being what I wanted.

It's really like a whole new bike, TBH.
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"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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