ninjette.org

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

Notices

Reply
 
Thread Tools
Old March 10th, 2017, 06:50 AM   #41
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
We went to the oversized bearing route , rod and the shaft will be grounded and heat treated and will insert an oversize bearing and ensure factory spec bearing clearances.
juliusmichaelhonrada is offline   Reply With Quote




Old March 10th, 2017, 07:28 AM   #42
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
Sounds like a reasonable solution. I wouldn't know where to go if I wanted to get a crank heat treated after grinding, but I guess I could find someone if I looked hard enough.

Imagine someone taking it apart in 2058 to replace the bearing inserts.
Triple Jim is offline   Reply With Quote


Old March 10th, 2017, 11:23 AM   #43
Motofool
Daily Ninjette rider
 
Motofool's Avatar
 
Name: Hernan
Location: Florida
Join Date: Mar 2011

Motorcycle(s): 2007 Ninja 250

Posts: A lot.
MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16
Cool

Quote:
Originally Posted by juliusmichaelhonrada View Post
........rod and the shaft will be grounded and heat treated.......
The order of the operations is machining (with cutting tool)- heat treatment - grinding (to final dimensions and finish).

Re-read my previous post and links for clarification.
__________________________________________________
Motofool
.................................Never ride faster than your guardian angel can fly
"Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
Motofool is offline   Reply With Quote


Old March 14th, 2017, 05:53 AM   #44
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
got an update from the machinist he said the crankpin will need to be "build up"? what the hell is build up , will they weld a metal jacket? lol , they said they cant find the exact size bearing for the grind/ground method to work so they suggestd to build up the crankpin and use the std factory bearings? but what the hell is build up?

p.s it was something like this

Link to original page on YouTube.

juliusmichaelhonrada is offline   Reply With Quote


Old March 14th, 2017, 06:35 AM   #45
Mohawk
ninjette.org guru
 
Mohawk's Avatar
 
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016

Motorcycle(s): ZZR250, VFR800

Posts: 475
Build up is welding in new metal, then grinding it back to the original size. Its a poor way to repair the damage, but without pulling the crank apart its the only way. It does have some advantages, the pin will be welded to the webs, and provided they manage not to warp it it should be fine. White metal shells a very soft, its the finish that is important rather than surface hardening, but that can be achieved with carbon & heat treatment.

Have fun
Mohawk is offline   Reply With Quote


Old March 14th, 2017, 07:06 AM   #46
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
I believe a Ninja 250 crankshaft is a one piece forged part.
Triple Jim is offline   Reply With Quote


Old March 14th, 2017, 07:07 AM   #47
jkv45
Rev Limiter
 
jkv45's Avatar
 
Name: Jay
Location: WI
Join Date: Jul 2013

Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes

Posts: A lot.
MOTM - Jun '18, Oct '16
You are really in deep here.

Unless you are racing, taking a Ninja engine down completely and rebuilding it completely isn't economically feasible in my mind. Especially when you have issue like you do, the repair costs usually far exceed the cost of a replacement engine - and sometimes the value of an entire working motorcycle.
jkv45 is offline   Reply With Quote


Old March 14th, 2017, 08:08 AM   #48
ducatiman
ninjette.org certified postwhore
 
ducatiman's Avatar
 
Name: Gordon
Location: new york
Join Date: Sep 2009

Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R

Posts: A lot.
MOTM - Nov '18, Mar '17
^ +1 jkv
__________________________________________________
gordon@customcarbservices.com
Custom Carb Service
www.customcarbservices.com
ducatiman is offline   Reply With Quote


Old March 14th, 2017, 02:29 PM   #49
Mohawk
ninjette.org guru
 
Mohawk's Avatar
 
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016

Motorcycle(s): ZZR250, VFR800

Posts: 475
Ah but you are in the west like me & ripped off at every turn. He's in the phillipines where work is done for a reasonable cost ! No MacVilles to finance there (yet) !
Mohawk is offline   Reply With Quote


Old March 14th, 2017, 03:20 PM   #50
Motofool
Daily Ninjette rider
 
Motofool's Avatar
 
Name: Hernan
Location: Florida
Join Date: Mar 2011

Motorcycle(s): 2007 Ninja 250

Posts: A lot.
MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16
Cool

Quote:
Originally Posted by juliusmichaelhonrada View Post
.........but what the hell is build up?
http://www.practicalmachinist.com/vb...elding-206290/

http://forums.pelicanparts.com/911-e...pros-cons.html

http://www.gleasonengineering.com/
__________________________________________________
Motofool
.................................Never ride faster than your guardian angel can fly
"Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
Motofool is offline   Reply With Quote


Old March 17th, 2017, 04:04 AM   #51
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
Thank you so much guys , i learned a lot about crankshafts, one thing i noticed is that a pressed crankshaft is the best because you can just replace the crankpin anytime.

Next time i will be checking crankshaft methods of construction too before buying a bike ,honestly i was not prepared for this much trouble we thought it was only a carb issue because the engine was so quiet, well i will keep you guys updated if this welding will work or not , it might be a very radical solution but who knows, one thing about the ninja is that the engine parts are oversized or specced/constructed too much for its very low horsepower output might be for a longer engine lifespan.

i saw some stories online about a guy welding his honda cr250 crankshaft journal with a stick weld and he used an angle grinder and it worked this bike makes 45 horsepower , almost double of that of a ninja.
juliusmichaelhonrada is offline   Reply With Quote


Old March 17th, 2017, 04:53 AM   #52
Mohawk
ninjette.org guru
 
Mohawk's Avatar
 
Name: Chris
Location: Bristol, UK
Join Date: Feb 2016

Motorcycle(s): ZZR250, VFR800

Posts: 475
The forged crank is the BEST you can get, I never knew this bike had one. The ZZR makes 40Hp at the crank. This engine was designed in 1984 & thus puts it ahead of all bikes until 2005 in power terms ! It makes 160Hp/Litre since 1986 where as Litre bikes only started making that kind of power in the mid 2000's, so its a stonking engine for a 2 cylinder 250

I'm hoping my bigbore 282cc will make around 40Hp at the wheel when I get round to it

Hope you get it sorted soon.
Mohawk is offline   Reply With Quote


Old March 22nd, 2017, 02:50 AM   #53
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
i have a bad feeling about this



juliusmichaelhonrada is offline   Reply With Quote


Old March 22nd, 2017, 06:25 AM   #54
taz
????????????????
 
taz's Avatar
 
Name: T
Location: no where
Join Date: Feb 2016

Motorcycle(s): 2007 ninja 250, 14 ninja 300, 09 1125CR

Posts: A lot.
MOTM - May '17
that doesn't look usable to me.
taz is offline   Reply With Quote


Old March 23rd, 2017, 07:02 AM   #55
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
putting it back together now



bike will be parted out if the crankshaft blows again, the machinist gave us a 6 month warranty he said he made cranks like this for cars like chevy and no failure so far lets see but if it ever blows we wont be fixing this anymore crank will go to the trash can and we will sell all the usable parts to get all of our money back
juliusmichaelhonrada is offline   Reply With Quote


Old March 23rd, 2017, 07:41 AM   #56
taz
????????????????
 
taz's Avatar
 
Name: T
Location: no where
Join Date: Feb 2016

Motorcycle(s): 2007 ninja 250, 14 ninja 300, 09 1125CR

Posts: A lot.
MOTM - May '17
hope it works out good for you.
taz is offline   Reply With Quote


Old March 23rd, 2017, 07:59 AM   #57
jkv45
Rev Limiter
 
jkv45's Avatar
 
Name: Jay
Location: WI
Join Date: Jul 2013

Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes

Posts: A lot.
MOTM - Jun '18, Oct '16
Quote:
Originally Posted by juliusmichaelhonrada View Post
bike will be parted out if the crankshaft blows again, the machinist gave us a 6 month warranty he said he made cranks like this for cars like chevy and no failure so far lets see but if it ever blows we wont be fixing this anymore crank will go to the trash can and we will sell all the usable parts to get all of our money back
You were fine up to that point...
jkv45 is offline   Reply With Quote


Old March 29th, 2017, 12:15 AM   #58
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
Everything is back together now , the starter cranks very slowly initially, removed the sparkplug cranks faster but still slow, later it wont crank , battery may had died on us, reads 12.8 volts , then when cranking it reads 7-9 volts. you can almost tell it by cranking and looking at the voltmeter that when the voltages drops to 7-9 volts it sounds like the engine is going into compression stroke
juliusmichaelhonrada is offline   Reply With Quote


Old March 29th, 2017, 03:02 AM   #59
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
it was the starter solenoid , i hammered the thing 3 times and it cranks 200% faster than before , the bike started havent tried riding it yet but the crank didnt seem to blow , not yet
juliusmichaelhonrada is offline   Reply With Quote


Old March 29th, 2017, 04:10 AM   #60
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
we tried riding it , bike have power now, the only problem is the idle still fluctuates , 1500 to 3000 suddenly
juliusmichaelhonrada is offline   Reply With Quote


Old March 29th, 2017, 05:53 AM   #61
taz
????????????????
 
taz's Avatar
 
Name: T
Location: no where
Join Date: Feb 2016

Motorcycle(s): 2007 ninja 250, 14 ninja 300, 09 1125CR

Posts: A lot.
MOTM - May '17
nice to now it worked out for you, sounds like some carb work yet in store as long as the valve clearance is good.
taz is offline   Reply With Quote


Old March 30th, 2017, 12:20 AM   #62
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
anyone have a video on how to clean the 4 tiny holes under the butterfly valve and the mixture ports and the 2 holes in front of the airbox side
juliusmichaelhonrada is offline   Reply With Quote


Old March 30th, 2017, 05:38 AM   #63
ducatiman
ninjette.org certified postwhore
 
ducatiman's Avatar
 
Name: Gordon
Location: new york
Join Date: Sep 2009

Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R

Posts: A lot.
MOTM - Nov '18, Mar '17
sodablast followed by ultrasonic, compressed air
__________________________________________________
gordon@customcarbservices.com
Custom Carb Service
www.customcarbservices.com

Last futzed with by ducatiman; March 30th, 2017 at 07:55 AM.
ducatiman is offline   Reply With Quote


1 out of 1 members found this post helpful.
Old April 1st, 2017, 04:27 AM   #64
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
So we bought carb cleaners , did sprayed the 4 transition ports , and mixture ports. recheck all the hoses 1 was cracked(coasting enrichener fuel source) cut the cracked part and stretched it to accommodate the nipple ,we put RTV silicone in the diaphragm cover to seal it more just in case.
it runs now does not surge anymore from 1500-3500 suddenly and hangs there, now it goes up and down very slightly.

my brother dont know how to sync the butterfly valve and im sure its the cause(because he was the one who put the carb all back together) but im happy that we got some progress right now , it was the carbs all this time.

Here is the video sorry for my bad english

Link to original page on YouTube.

juliusmichaelhonrada is offline   Reply With Quote


Old April 1st, 2017, 05:11 AM   #65
michogan
ninjette.org newbie
 
Name: mick
Location: Melbourne
Join Date: Apr 2015

Motorcycle(s): zzr250

Posts: 3
parts fiche

http://www.cmsnl.com/
hi guys if you are looking for a parts fiche this website has a good one and they include the zzr250
Cheers
michogan is offline   Reply With Quote


Old April 1st, 2017, 05:53 AM   #66
ducatiman
ninjette.org certified postwhore
 
ducatiman's Avatar
 
Name: Gordon
Location: new york
Join Date: Sep 2009

Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R

Posts: A lot.
MOTM - Nov '18, Mar '17
after disassembly, a bench synch can be performed using feeler guages or even a business card to equalize the throttle plates...or if you're real good...by eye.

Additionally...in your case, Julius...I'd urge you to set/adjust both pilot screws as well.
__________________________________________________
gordon@customcarbservices.com
Custom Carb Service
www.customcarbservices.com
ducatiman is offline   Reply With Quote


Old April 5th, 2017, 02:08 AM   #67
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
Bike wouldn't idle , it still goes up and down from 1500 to 2500 every 1 second , its consistent , it doesnt hang , it just goes up and down like some moto gp bike that cant idle and the rider have to blip it everytime because there was no flywheel to store the rotational energy for the bike to idle.

The floats is our last hope now, it has come to our attention that we should try the old ex250f float bowls with the overflow tube and check for overflow , so far there was no overflow but also came to our attention was the float height , it was set to 19mm which is way too lean , now we had set it to exactly , 16.80mm using a digital caliper and and we put the old 250f float bowl to check for overflow , there was none , now we are just waiting for the carb to dry out in the sun(we use water to test overflowing) then we will put the stock zzr250 float bowl (assuming we have no gas overflowing and leaking with the 16.80mm float height


juliusmichaelhonrada is offline   Reply With Quote


Old April 7th, 2017, 05:34 AM   #68
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296

Link to original page on YouTube.

juliusmichaelhonrada is offline   Reply With Quote


Old April 7th, 2017, 06:01 AM   #69
taz
????????????????
 
taz's Avatar
 
Name: T
Location: no where
Join Date: Feb 2016

Motorcycle(s): 2007 ninja 250, 14 ninja 300, 09 1125CR

Posts: A lot.
MOTM - May '17
Wow nice work. What was the carb originally off of.
taz is offline   Reply With Quote


Old April 7th, 2017, 06:24 AM   #70
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
aftermarket keihin pe(roundslide) 28mm originally for the honda nsr 150 2 stroke market, it was in my 2 stroke yamaha rx135 i took the old Y manifold from my previous gpx250 and just tested it and it seems to be working better than the stock carb
juliusmichaelhonrada is offline   Reply With Quote


1 out of 1 members found this post helpful.
Old April 7th, 2017, 06:26 AM   #71
juliusmichaelhonrada
ninjette.org guru
 
Name: Julius Michael
Location: Philippines
Join Date: May 2016

Motorcycle(s): GPX250-RII

Posts: 296
i didnt rev it high because the main jet was only #102 , way smaller than stock
juliusmichaelhonrada is offline   Reply With Quote


Old April 7th, 2017, 06:49 AM   #72
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
Very interesting. I've been wondering how a couple Mikuni VM carbs would work on a 250. Next time please hold the camera a lot steadier!
Triple Jim is offline   Reply With Quote


Old May 3rd, 2017, 05:59 AM   #73
mediace
ninjette.org newbie
 
Name: din
Location: malaysia
Join Date: Dec 2016

Motorcycle(s): el250

Posts: 5
how single carb performance?
mediace is offline   Reply With Quote


Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
Poor idle 250 ZZR Tkell1 1986 - 2007 Ninja 250R Tech Talk 3 August 24th, 2016 07:42 PM
Idle jumps to 9000 rpm on choke then wont stay idle after off Shawn250 2008 - 2012 Ninja 250R Tech Talk 1 June 19th, 2012 06:45 AM
Erratic idle, wont start cold, etc. d16soda 1986 - 2007 Ninja 250R Tech Talk 9 August 24th, 2011 02:12 PM
bike wont idle right :( 86ninjarider 1986 - 2007 Ninja 250R Tech Talk 11 August 3rd, 2011 09:09 AM
bike wont idle james250ninja 1986 - 2007 Ninja 250R Tech Talk 7 April 1st, 2010 12:05 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 02:51 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.