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Old April 2nd, 2012, 07:41 PM   #161
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Old April 2nd, 2012, 07:45 PM   #162
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^^ if @Felipe the Ant comes to Cleveland this summer and has time to do internal work on my engine for the cost of parts and teaching me some of the stuff, I'm totally letting him have some fun on my engine!
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Old April 3rd, 2012, 02:57 PM   #163
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Originally Posted by choneofakind View Post
^^ if @Felipe the Ant comes to Cleveland this summer and has time to do internal work on my engine for the cost of parts and teaching me some of the stuff, I'm totally letting him have some fun on my engine!
I'm totally down for that. I'll probably do mine too if I have the money
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Old April 3rd, 2012, 02:59 PM   #164
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Old October 8th, 2012, 03:46 AM   #165
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Wayan and RacerX, I would appreciate if you can comment on my thread. I am looking at doing some similar work on my bike and have been told a few things by a local mechanic here in Jakarta. I am not sure if what he says is 100% correct and/or what you guys think is the best way to go. I don't care about the cash side too much (just looking for extra-testicles for my bike): http://www.ninjette.org/forums/showt...967#post581967
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Old March 11th, 2015, 12:08 PM   #166
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each to their own but i have a 200 hp bike and i'm really digging the slowness of the 250r-it's kind of liberating -i 'm throwing a few go fast things at it but only a few people in the world can get the most out of a superbike-it's a blast wringing that little bike out and making the most of your riding ability -i'm, new to the 250r and maybe i will sick of the lack of power ,but right now its a blast
I don't have a 200hp bike (currently or previously) but I did have a 2004 zx-10r. What ratlab said couldn't be more true for me. The bike I've got is a blast and only NEEDS modifications to fit different bodies/riding styles (spring rates, clip-ons, rearsets, etc.). I've done all that and now all I have to do is keep her full of gas and fresh oil
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Old February 19th, 2016, 06:07 AM   #167
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282cc... mmm...mmm...mm... anyone know if that is possible to bore up with the original sleeve? or does it need a totally new/replaced piston sleve thinggy? lol, forgot what its called

back to square one, research time, yey!
Well I'm new on here, but have had a ZZR250 (same engine as old Ninja 250 up to 2006) for a few years with some serious chassis upgrades, done I decided it need more performance. After a bit of internet searching I settled on a 282cc big bore, so just picked up my spare cylinder after re-sleeve & big bore to 66mm.

To achieve this I used a second hand Kawasaki ZZR600 cylinder block, removed 2 liners & had them retro fittied to the 250 block, then bored to 66mm to take kawasaki ZX6R pistons.

I only picked this up this morning, so will be a while before I get round to rebuilding the engine. I'll throw some pictures up later.

So yes doable, but expensive as the block has to be machined, to accept the new liners, because the original 62mm ones can't be bored to 66mm, not enough material.

FYI the orginal liners are 62mm bore with 3mm wall thickness for 68mm OD. The ZZR600 press fit wet liners are 64mm bore with 3.5mm wall thickness, for 71mm OD. Now bored to 66mm so 2.5mm wall remaining. Those in the know say 2mm wall is the minimum thickness limit, so should be good.

The ZX6R piston weight is similar, need to weigh them & designed for a similar max RPM (14K in the ZZR250), so should also be good.

Last futzed with by Mohawk; February 20th, 2016 at 01:31 AM.
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Old February 19th, 2016, 01:51 PM   #168
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*71mm OD
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Old February 20th, 2016, 01:32 AM   #169
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Thanks now corrected at 71mm, sorry was a typo.

Last futzed with by Mohawk; February 20th, 2016 at 02:50 AM.
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Old July 7th, 2017, 07:32 PM   #170
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Originally Posted by sombo View Post
Well if it's been confirmed that the 500 motor fits in the 250 frame, then I got news for you. That would mean the 650 motor will fit too. Believe it or not, but the outter dimensions of the 650 motor are smaller then the 500 making it lighter and slimmer. Imagine putting one of those puppies in the 250 frame.......... 71hp with about 48lb-ft of torque.
It would be like the video game road rash. An 1100/750. 1100 wedged in a 750 chassis.

But that's the case with the 04+ smaller gixxers right? The 750 is just a 600 with a bigger engine?

In still making my way thru this thread, but is there a hands down conclusion?
I started a thread for big bore kits and no responses, and this thread starts out saying there are none.

The 500R 0-60 time is one, to 1.5 seconds faster than the 250.

Can the 500 be out in a Or even 250? Is it plug and play? Everything connects right back up?
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Old July 8th, 2017, 03:25 PM   #171
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The 500 may fit, but I've never seen a completed one. Nothing else will fit though, the carbs are bigger & wider spaced than the 250 because it has a central cam chain.
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Old July 8th, 2017, 05:45 PM   #172
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Haven't seen one for the Ninja 250. Here's a link to Wiseco big bore kits, which they make for a whole pile of different Kawasaki streetbikes (and other makes), but no kit for the 250:

http://www.procycle-online.com/bigbore/bbstreet_kaw.htm

When people go about improving the ninja 250's engine performance, for street use at least, typical mods include intake improvements/exhaust improvements/timing, rather than wholesale component replacement. There's no technical reason why more couldn't be done, but at some point the costs would be hard to justify instead of choosing a different bike to start with more power.
There's no substitute for cubic inches.

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Old July 8th, 2017, 05:54 PM   #173
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This cat make some serious sense.

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