February 18th, 2015, 07:47 PM | #121 |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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Thanks bud, I pulled my 300 rotor and compared it to the 250 tonight, I took a photo of both of them and overlaid the photo on the PC and found the marks are dead on the same between the 250 and 300.
The other thing I did was try to swap the wires on the ignition pickup incase there was a difference there..... tried it, bike wouldnt run and would just misfire. Thanks for the help! |
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March 29th, 2015, 05:42 PM | #122 |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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@cuong-nutz - do you have a 250 or 300 valve spring you could get me some measurements?
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March 30th, 2015, 09:10 AM | #123 | |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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Quote:
Overall length Outer diameter Inner diameter coil thickness Thanks!!! |
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March 30th, 2015, 12:23 PM | #124 | |
RIP Alex
Name: Cuong
Location: Houston, TX
Join Date: Apr 2011 Motorcycle(s): '10 250r, '09 265r Posts: A lot.
Blog Entries: 2
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Quote:
49078-0060 (250) 49078-0077 (300)
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HalfFast Racing Team Serving Greater Houston Area Riders:WFO Riders MotoHouston HPC CMRA Ride Smart Fastline Lone Star Track Days |
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March 30th, 2015, 12:33 PM | #125 | |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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Quote:
some older 600's use the same retainers and the same buckets but measure up to 10mm longer free length so maybe I can get a set of 600 springs to work for me. if not I can send the head in to APE and have them make a set depengin on price. |
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April 1st, 2015, 04:52 PM | #126 |
ninjette.org member
Name: Michael
Location: Tehachapi, CA
Join Date: Oct 2014 Motorcycle(s): 2014 Ninja 300 Posts: 160
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We can do that... The only part I would be worried about with the 600 springs is coil bind at full lift. You need .050 space from full lift to coil bind to avoid breaking springs, and thats on the ragged edge.
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April 2nd, 2015, 05:55 AM | #127 | |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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Quote:
I'll give it a try with the 600 springs, I'm not looking to spend much more money on the project but if they work out it wont be to much. OP - Any luck on any spring dimensions? If not no worries I ordered a brand new 250 spring to check out. |
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April 2nd, 2015, 07:38 AM | #128 |
RIP Alex
Name: Cuong
Location: Houston, TX
Join Date: Apr 2011 Motorcycle(s): '10 250r, '09 265r Posts: A lot.
Blog Entries: 2
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Shawn, I'll get you the measurements when I get home. Battery died with my digital caliper.
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HalfFast Racing Team Serving Greater Houston Area Riders:WFO Riders MotoHouston HPC CMRA Ride Smart Fastline Lone Star Track Days |
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April 2nd, 2015, 07:47 AM | #129 |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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April 2nd, 2015, 04:10 PM | #130 |
RIP Alex
Name: Cuong
Location: Houston, TX
Join Date: Apr 2011 Motorcycle(s): '10 250r, '09 265r Posts: A lot.
Blog Entries: 2
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@garth285,
These are the best measurements I can do: coil thickness: 3.15 mm spring ID: 14.35 mm spring length: 39.25 mm spring OD: 20.8 mm coil distance: 3 mm 3 resting coils 5 active coils
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HalfFast Racing Team Serving Greater Houston Area Riders:WFO Riders MotoHouston HPC CMRA Ride Smart Fastline Lone Star Track Days |
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April 3rd, 2015, 05:29 AM | #131 | |
KAWASAKI GURU
Name: Shawn
Location: Florida
Join Date: Jul 2013 Motorcycle(s): Turbo Ninja 250 Posts: 863
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Quote:
Awesome, thanks so much! I should have some springs in within a few days, hey @APEmike you dont have a list of spring measurements laying around do ya, know if any other springs have near the same measurements? |
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April 30th, 2015, 04:01 PM | #132 |
ninjette.org member
Name: Kostas
Location: Greece
Join Date: Oct 2011 Motorcycle(s): Kawasaki Ninja 250R (2009 European Model) Posts: 32
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I have a ninja 250r('09) (european model so yes I have FI ..although no fuel gauge)
Is it possible to exchange the crankshaft from a 300r? it should be a nice bump in horsepower without any "mods" and if you want some port job and maybe a 1mm or 2mm overbore pistons it should be quite a power boost(compared to stock 250r) |
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April 30th, 2015, 07:31 PM | #133 | |
Freedom for Germany
Location: This World
Join Date: May 2011 Motorcycle(s): Ninja 250R-FI Posts: A lot.
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Quote:
But one easy word from me about engines, the longer the stroke the less the engine likes to rev up to higher rpm and if you do the more early it will break |
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May 4th, 2015, 03:31 AM | #134 | |
ninjette.org member
Name: Kostas
Location: Greece
Join Date: Oct 2011 Motorcycle(s): Kawasaki Ninja 250R (2009 European Model) Posts: 32
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Quote:
I was rev 12k-12.3k before that(just made an oil chance ..authorized kawa dealer) but it was under warranty and was completely restored, new head new cylinder+pistons ..I'd prefer if I have more mid rev power than high because as said as much as I like it, it comes with a price, now I don't go more than 11k most of the times and usually change gears at 8-10k Last futzed with by crackez; May 4th, 2015 at 04:37 AM. |
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May 4th, 2015, 08:34 AM | #135 | |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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Quote:
https://www.ninjette.org/forums/show...&highlight=335 Last futzed with by bruce71198; May 4th, 2015 at 08:39 AM. Reason: add link |
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May 4th, 2015, 05:32 PM | #136 | |
Freedom for Germany
Location: This World
Join Date: May 2011 Motorcycle(s): Ninja 250R-FI Posts: A lot.
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Quote:
And a word about more midrange power: Advance your ignition by 5 degrees (please don't ask me about the company, since in my believe the owner has good technical knowledge, but what I think from the human point of view it looks quite different). |
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May 5th, 2015, 12:00 AM | #137 | |
ninjette.org member
Name: Kostas
Location: Greece
Join Date: Oct 2011 Motorcycle(s): Kawasaki Ninja 250R (2009 European Model) Posts: 32
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Quote:
From what I saw the oil bolt was missing when check the bike ..after the incident and they told me that it can happen when such thing occur(also these occur sometimes and I was like whaaaa) I'm not convinced that it was engine failure or my fault, if the bolt wasn't tight properly it could happen to drip oil or even worse the bolt to fall appart from vibrations, I didn't see any torque wrenches when they screw it so. I do have a torque wrench and I tight it according to the manual. This happened a few years back but since then I do the oil changes and the oil filter changes with no incedent, still afraid to push her far ..going fast and having the engine broken is a bad experience, when it happened something pulled me back and the force was quite strong, luckily I was able to hold her and also from instinct I've put all my body in front(I had a bad experience with a Honda Astrea Supra(previous bike) .. its a moped with back flat tire and did the same ..saved me too, I had chance the piston there from 50mm to 53.5mm although going from 97.1cc to 112.3cc wasn't much the power increase was huge stroke 50mm) ..when engine broke oils and water engine went to the back tire.. almost no control of the back tire.. it was like going through ice heheh I can talk about it for a while but my post is already long Not sure if I'm going to do this but I'm researching ..if its possible, I just don't trust much other people and I don't have a guy that I know he would do a good job, you know what I mean? if it was up to me I could turn the bike into electric I do have the knowledge to do that(I already have a custom ebike) but that isn't possible because I live in Greece and mods like this cannot pass regular check ups(happens every 2 years and check almost everything and Co2 emissions) ..there not too strick check ups so having it 300cc won't matter, no one will notice it - but finding a mechanic to rely on after this simple oil chance incident is hard(it might be as they said and the bolt might fall after this small "explosion" but still I have my suspicions I'm not a mechanic myself, far from it.. changing a moped head or piston/cylinder with a help of a mechanic is different than the ninja, to their defense I did change the spark plugs to iridium ones a few months before my accident ..don't know if these push the engine too much although I doubt it) |
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May 9th, 2015, 09:47 AM | #138 |
ninjette.org member
Name: Olgierd
Location: Europe; Poland
Join Date: Sep 2010 Motorcycle(s): Ninja 250R Posts: 12
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Awesome thread
Was wondering if You have both shifting forks laying around from 250 and 300 ? I need to know how diffrent they are both visualy and by measurement. I am over 2000mil after engine swap and I keep miss-shifting gears despite best of efforts and technics plus to lever has long throw. As I read it's common for ninjas to have moody gearbox. |
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December 24th, 2015, 12:50 PM | #139 |
ninjette.org newbie
Name: Mark
Location: San Diego, Ca
Join Date: Dec 2015 Motorcycle(s): 2007 EX 250 Posts: 2
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cuong-nutz, thank you very much for taking to time to add this wealth of knowledge to the community.
This is my first post so I'll get right to it. I'm very slowly building a high hp turbo 250 for landspeed racing and am in the initial stages of motor design. What is the connecting rod measurements for the 250 if you have one laying around? big and small journal diameters, & rod length Thank you, Mark |
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December 24th, 2015, 06:23 PM | #140 | |
Freedom for Germany
Location: This World
Join Date: May 2011 Motorcycle(s): Ninja 250R-FI Posts: A lot.
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Quote:
maybe the attached picture could show what you're looking for? You'll find them here: https://www.spearsenterprises.com/ex250.html May I ask you about your plan: high cr and low boost or the real thing, low cr and high boost? Good luck Last futzed with by Somchai; January 23rd, 2016 at 11:38 PM. |
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January 16th, 2016, 12:57 AM | #141 |
ninjette.org newbie
Name: Mark
Location: San Diego, Ca
Join Date: Dec 2015 Motorcycle(s): 2007 EX 250 Posts: 2
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Somchai,
Thank your for the link, it seems they make more aftermarket parts for this engine than I was aware. I would love to share the details of my build, but its only in planning stages at the moment to see about the feasibility of my project within budget & hp/mph goals. Initial plans are to go with somewhere around 10.5:1 CR and over 30psi boost. This is a dedicated race only Bonneville build. The air up there is thin and requires higher CR and boost to compensate. Spec fuels will either be leaded 117 octane or methanol. My concerns are how good of a platform is the ninja 250 to use in this application vs another model 250? Obviously I will be asking way more than ANY 250 should be easily capable of, but if one platform isn't quite as durable (block, heads, etc) as another then I will obviously choose the beefier one. One of the areas I will need to likely spend most of my budget will be the rotating assembly. It seems IMHO any of the readily available aftermarket parts (rods & pistons) will not be durable enough or are not suited for high HP and high boost. The piston pins are only .630" .120" wall thickness. this will have to be increased which will necessitate custom ordered rods and pistons, which have to be ordered in sets of 4. Another area of concern is the heads and how much can the ports be enlarged before hitting a water jacket or other obstacle as well as the ability for larger valve springs. Any how, enough ramblings for one night, Cheers. |
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April 8th, 2019, 06:51 AM | #142 |
ninjette.org guru
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016 Motorcycle(s): ZZR250, VFR800 Posts: 491
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Digging up an old thread here.
So if no one has yet made a decent 300 big bore kit, then how about running a 250 cylinder in a 300 engine, using Wiseco 64 or 66mm 12.5-1 comp pistons ? So the question is will a 2008-12 250 cylinder fit into a 300 engine ? Looking at pics from this comparison strip down, it looks possible. Anyone got the parts to test / dry fit ? |
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April 8th, 2019, 07:32 AM | #143 |
CCS Amateur #501
Name: Dave
Location: Iowa
Join Date: Jun 2015 Motorcycle(s): '09 250 SE 'Booger' Posts: 406
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Spears sells a +2 mm kit. $1000 us. Oversized 250 pistons will need custom rods or some other tweak to work with the 300 crank. Piston skirt clearance may be an issue? Oversize 300 pistons would need rings for iron cylinders instead of nikasil (i believe... I have been told this but havent found a definitive source on the question.)
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April 8th, 2019, 10:15 AM | #144 |
ninjette.org guru
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016 Motorcycle(s): ZZR250, VFR800 Posts: 491
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Since I posted this question, a bit more research lead to spears site. But I’m in the UK, so add in import duty & 20% taxes & their kit is expensive, plus no idea of the weight of the pistons. The Wiseco 64 or 66 300 pistons at 12.5/1 compression would work.
The other thing I found on sears is the high comp stock bore gasket that may be a simple solution for a bit more torque ! FYI Nikasil or other SIL rings will work fine on an iron bore, but NOT the other way round. Last futzed with by Mohawk; April 8th, 2019 at 03:13 PM. |
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April 8th, 2019, 02:38 PM | #145 |
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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Look up bruce71198's big-bore 250 builds. He's doubling 250's power output, or more than current 400!!!
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July 5th, 2020, 12:26 PM | #146 |
ninjette.org guru
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016 Motorcycle(s): ZZR250, VFR800 Posts: 491
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So having acquired a 300 engine & compared pistons with newgen 250.
Weight complete with rings, pin & 1 circlip. 300=157grams 250=167grams So 250 pistons are quite heavy due to the raise dome for higher compression. It also has a higher deck height. The ZX6R 66mm piston I have been reworking is down to 175grams. The 300 uses a modern X braced piston design compared to the older parallel pin boss walls on the 250 & 600 pistons. This lets it run a 5mm shorter wrist pin, which saves 4grams. 31.3grams verses 35.3grams. ZX6R pin is 40.2gram due to having 3mm wall thickness, compared to 2.5mm wall on the 250 & 300 pins. Just bought I’d share. |
1 out of 1 members found this post helpful. |
July 18th, 2020, 02:05 PM | #147 |
ninjette.org guru
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016 Motorcycle(s): ZZR250, VFR800 Posts: 491
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So some more digging & the bare piston weight of the spears 13/1 is 135grams.
I'm going to go with ZZR600 64mm big bore for 315cc. These pistons complete are 169grams, with a little work I can get them to down to 165grams, so 8grams heavier than stock but should be fine. Will give 12/1 compression. |
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May 1st, 2023, 08:34 PM | #148 |
ninjette.org newbie
Name: Glenn
Location: Sydney Australia
Join Date: May 2023 Motorcycle(s): YZF600r - I know it's not an Ninja, but the Ninja pistons insterest me a LOT Posts: 1
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Old thread I know and I don't own a Ninja but am considering the EX250 pistons as candidates for a FZR400/YZF600r project.
The very reason I am seriously considering the EX250 pistons is because of this thread and these forums. Just wanted to say you guys leave so many other forums for dead when it comes to getting across the important details and taking meaningful measurements and photos. Seriously good work! |
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