January 30th, 2019, 08:27 AM | #1 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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NEED HELP!!!!! 07 ninja ex250 won’t start
I just picked up an 07 ninja 250 ex and i took carbs out cleaned them(leaked when I was done) took them off again re cleaned about 7 times anyway the bike turns over (when jumped from terminals (dead batt) anyway dead battery but turns over and gets spark and gas is getting to the motor (gas on plugs) but it won’t start I’ve heard it backfire 1 time and that’s it the motor only has 14000 on it. Looking to fix it but I have no clue what it could be (besides the batt) if u could help out that would be great
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January 30th, 2019, 08:52 AM | #2 |
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MOTY - 2018, MOTM - Nov '17
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Hi Mikey and welcome!
You may have multiple issues here, so let's tackle them one at time. 1. cam-timing take off valve-cover, rotate engine by hand to TDC and verify each cam is oriented correctly. 2. valve-clearance adjustment. Out of spec clearance would prevent engine from starting... well, depends upon how far out they are 3. ignition. Pull ignition wire and stick spare plug into it. Lay on top of engine so case is grounded. Crank engine, do you see a hot blue spark? 4. fuel. Most likely culprit. Visible wet fuel on plugs means you're getting, way, way too much. Liquid petrol does not combust. My school shop teacher shows us scary demonstration by throwing lit match into bucket of petrol! It went out! Only when you vapourise small amount of petrol with lots of air does it ignite. Probably someone previously thought more fuel is better and monkeyed with your carbs to add more fuel. Verify all jets are factory-sized and idle-mixture screws should be 2.5-turns out. |
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January 30th, 2019, 08:55 AM | #3 |
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Name: Hector
Location: SoCal
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Did you set the air mixture screws to about 2.5 turns out? Did you drain the tank and put in NEW gasoline?
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January 30th, 2019, 09:04 AM | #4 |
ninjette.org member
Name: Mikey
Location: Rusk
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Yes tank was completely empty but a little rusty put alcohol and fuel and stuck a chain inside it and shook it a lot to get rust out then drained and let dry before hooking up to carbs I’m going to have to check the idle screws bc I’m not too sure but I wasn’t for sure about the battery situation my kz650 needs a full 12 v before it will start and won’t start with jumper cables so I’m a little iffy on it the bike sounds like it has compression but I don’t have a tester to check
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January 30th, 2019, 09:06 AM | #5 |
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MOTY - 2018, MOTM - Nov '17
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If you're near AutoZone they have free tool-rental program. Compression-test would be good start as it will tell you condition of rings along with cam-timing and valve-clearance in single test. Should be in +200psi range. I still suspect carbs issue.
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January 30th, 2019, 09:10 AM | #6 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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It’s an 07 with 14000 miles I’ll go ahead and check on valves Tdc and etc how would I go about checking timing I have bright blue spark out of both plugs
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January 30th, 2019, 09:51 AM | #7 |
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MOTM - Nov '18, Mar '17
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if an individual is not sure of the position of the pilot screws after doing a carb service that usually means they weren't actually removed during the cleaning service.
And by not removing them...it means your carbs are NOT truly clean. The pilot jet to pilot screw passage is vitally important to vigorously clear. Both screw and jet MUST be removed to fully access and service the circuit, returning to accepted starting position of 2.5 turns. (Further setting/tuning , bike hot, for highest RPM for each cylinder is advised, up to the individual to take the time and effort.... and avoid burning oneself! ) Minimum compressed air (powerful, not the canned stuff) and carb cleaner required in this application. FWIW...always wise to replace the tiny orings and clean/polish the metering tip of the pilot screw whilst you're in there, too! NEVER start a carb service without full kits/orings and float valves in hand. These are consumables with replacement needs, never meant to last the life of the bike. Good luck with it, hope the above helps and you work it out easily.
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January 30th, 2019, 09:54 AM | #8 |
ninjette.org member
Name: Mikey
Location: Rusk
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They were taken out I’m just not sure if there 2.5 out or not I count turns out and sent them in the same amount
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January 30th, 2019, 10:39 AM | #9 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
Once the engine is fully warm you need adjust them to the optimal setting, which changes with numerous factors like temperature, mods, type of gas, etc. Idle mixture adjustment - https://faq.ninja250.org/wiki/How_do...dle_mixture%3F You also want to sync the carbs and set the idle speed to 1300 when you are done. There are other factors that can affect how the engine runs and idles, including mods, air filter condition, jetting, other settings, and valve adjustment. |
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January 30th, 2019, 10:53 AM | #10 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Jkv45
Can u guide me through timing I’m gunna check that here soon I don’t wanna dig in and screw up so if u could tell me what to look for that would be great |
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January 30th, 2019, 05:48 PM | #11 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Alright update!!
So I took valve cover off looked great somebody definitely rebuilt it motor was clean four a manual for it online figured out how to time it and it was already timed out it all back together went to start it and I sprayed starting fluid in it and it started but wasn’t picking up fuel took carb back out noticed I forgot the small jet next to big main jet well anyway I pulled them out and someone had drilled them out is there a problem with that or is it fine? |
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January 30th, 2019, 08:19 PM | #12 | |
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Quote:
Drilled jets out to remove? Visible damage? Or to resize? Oversized visible to eye? To expect accurate answers, please clarify on all counts, please.
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January 30th, 2019, 08:23 PM | #13 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Yes forgot to pull the pilot jet out when went through the carburetor I took it off again today bc it would only start and run on starting fluid and when I took it apart I thoroughly looked at it and I noticed the jets and I pulled them out and they have been drilled out in the center to make the jets bigger will that hurt anything
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January 30th, 2019, 08:26 PM | #14 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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I’m sorry I’m new to this stuff so if I’m making it a little difficult to understand I’m sorry I’m just trying to get it to run
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January 30th, 2019, 09:02 PM | #15 |
ninjette.org certified postwhore
Name: Gordon
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Starting fluid is not a path to a repair, on the contrary can do permanent damage to the costly slide rubbers. Its use will not correct the root of the problem.
The pilot jets are drilled so large that you, being "new to this stuff" can tell? Not sure what would motivate someone to create that destruction. Yes, a return to new, correct pilot jets would be highly recommended. Keihin size 38 pilot is what the factory supplied. That would be the first, obvious recommendation. I believe I've got them in stock. Its dawning on me, if pilots have been radically drilled...what other "tricks" did a previous owner do to the carbs? A scary thought. Are the main jets marked with a size? Tiny, stamped on the side of the jet. Needles have numbers? Are they adjustable (with a clip?) indicating a jet kit is installed. Beyond replacing pilot jets, there may be more involved. Your carburetors need careful review in and out, top to bottom......now knowing that someone irresponsibly hacked the pilots...WHAT ELSE DID THEY DO? OR NOT DO? Does the bike have factory airbox and exhaust installed? I dunno...you may want to consider my services. It would certainly cut to the chase.
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gordon@customcarbservices.com Custom Carb Service www.customcarbservices.com |
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January 30th, 2019, 09:13 PM | #16 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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I’ve worked on a few bikes of my own and was taught a little about bikes and I kno the pilot jet is a very small jet with a small opening these pilots holes aren’t that small so I’m pretty sure they have been drilled or something I’ll get a pic tomorrow when I go to work on it tomorrow
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January 31st, 2019, 03:17 AM | #17 |
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MOTY - 2018, MOTM - Nov '17
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Do search for "clean carbs ducatiman" to see what it really takes to refurb carbs back to factory-fresh condition. You may find it would take you an extraordinary amount of time to really restore those carbs. Ducatiman can get it back to you within week or so and you'll be riding in no time!
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January 31st, 2019, 07:12 AM | #18 |
Rev Limiter
Name: Jay
Location: WI
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Sounds like you need to replace all of the jets and check for other rookie carb mods.
Drilled jets will mess everything up, so I'd replace all of them. It also sounds like all of your problems are carb related. If you want it done completely, absolutely, positively right, you need to talk to ducatiman. They will be good as new and almost perfectly adjusted when you get them back. If you choose to do it yourself, be prepared to struggle a bit and remove/disassemble/reassemble/install the carbs a few times before you get it right. |
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January 31st, 2019, 07:33 AM | #19 |
ninjette.org certified postwhore
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@Oldskool you've listed your location as "Rusk"...exactly where is that?
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gordon@customcarbservices.com Custom Carb Service www.customcarbservices.com |
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January 31st, 2019, 08:06 AM | #20 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Rusk is a town in Texas. How much is it for ducatiman to do a carb
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January 31st, 2019, 08:47 AM | #21 |
Rev Limiter
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.
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January 31st, 2019, 09:18 AM | #22 |
ninjette.org certified postwhore
Name: Gordon
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so, providing no pics of drilled pilot jets?
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gordon@customcarbservices.com Custom Carb Service www.customcarbservices.com Last futzed with by ducatiman; February 1st, 2019 at 11:13 AM. |
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February 13th, 2019, 06:50 AM | #23 |
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February 15th, 2019, 09:41 AM | #24 |
ninjette.org member
Name: Jack
Location: Texas
Join Date: Jan 2019 Motorcycle(s): Ninja Kawasaki 250r 2006 Posts: 22
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Rusk is not too far from where I live! I sent my carbs to Ducatiman and shipping was really cheap. The time it took for it to get back to me was insanely quick too. Definitely give him a PM if you want to without question eliminate the possibility of your carbs being the issue.
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February 15th, 2019, 07:33 PM | #25 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Sorry everyone I haven’t been on for a while I got a carb kit and bike started up I now have a problem with pcv or something at first oil and gas were pouring out of the air breather but I changed the oil and haven’t started since
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February 15th, 2019, 07:35 PM | #26 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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I’m sure the gas came from flooding the engine for long periods of times but to be sure I changed it there was(4 quarts of oil gas mix when drained)
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February 16th, 2019, 09:01 AM | #27 |
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MOTY - 2018, MOTM - Nov '17
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Glad to hear you're making progress!
Petrol from flooding engine with too much goes out tailpipe when engine is cranking. More likely float-valves weren't sealing and gas dribbled into engine that's stationary (sitting & not spinning). Did you replace float-valves? O-rings for pilot jet? |
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February 16th, 2019, 09:04 AM | #28 |
ninjette.org member
Name: Mikey
Location: Rusk
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Are you talking about the needle?
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February 16th, 2019, 09:15 AM | #29 |
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MOTY - 2018, MOTM - Nov '17
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The float-valves are #16030. They are pushed up by floats and seals off fuel-inlet from gravity pressure. Otherwise, fuel continues to flow into carbs, fills up bowl and pushes out jets and dribbles down into engine.
While at university, I got my first VF500F for free because guy thought he seized engine. Upon closer inspection, crankcase was completely filled with petrol and engine wouldn't crank or bump-start. Leaky float-valves was culprit. I went back and gave him $500 for it. |
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February 16th, 2019, 09:17 AM | #30 |
ninjette.org member
Name: Mikey
Location: Rusk
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Yes they were replaced I’ve just always called them a needle valve
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February 16th, 2019, 05:37 PM | #31 |
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MOTY - 2018, MOTM - Nov '17
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Replaced with stock sizes?
- pilot jet - pilot needle & O-ring - main jet Also: - soaked in caustic radioactive solvents in ultrasonic cleaner? - flossed through all hidden fuel-circuits in carb? - soda-blased all fuel-circuits? |
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February 16th, 2019, 06:38 PM | #32 |
ninjette.org member
Name: Mikey
Location: Rusk
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I pulled apart and dipped it in a can of carb cleaner then soda blasted and redipped then dried out put a pipe cleaner through the ports and re built it with new stock sized jets and even put new floats
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February 16th, 2019, 08:42 PM | #33 | |
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MOTY - 2018, MOTM - Nov '17
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did you floss all hidden secret passages?
Quote:
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February 16th, 2019, 08:47 PM | #34 |
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MOTY - 2018, MOTM - Nov '17
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Also disassemble carbs down to individual components for thorough cleaning of each part?
Take apart emulsion tube into constituent parts: main jet, holder, needle jet collar. Note how needle-jet collar is oriented so you can re-assemble later same way. Unscrew pilot jet being careful to not lose spring, washer and O-ring. Might as well replace O-ring, float-bowl seals and float-valves. Then use soft copper wire of various diameters to poke through all tiny little orifices in all parts. Some people use guitar string to floss out secret passages in carburetor body. Blow compressed air through all circuits and verify you've got air coming out other end. Here's good site for working on these carbs: http://www.vulcangadgets.com/files/keihin_carb.html |
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February 16th, 2019, 09:37 PM | #35 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Yea man I got all that stuff down read a lot of different forums and videos and different websites got it done and started up fine but I never changed the oil after getting (due to being a project) so I just wanted to get it to run first but anyway the motor was full of oil fuel so I drained it replaced oil filte and oil but I haven’t gotten around to starting it yet but I plan on starting it tomorrow
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February 16th, 2019, 11:48 PM | #36 |
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Alright! Looking forward to it starting up and running!
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February 17th, 2019, 03:43 AM | #37 |
ninjette.org guru
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If the oil has fuel in it, I believe that points towards the petcock.
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February 17th, 2019, 09:34 AM | #38 | |
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Quote:
For the carbs to overfill, the petcock is leaking and the float needle and seat are not sealing, if ether is working properly it won't fill the crankcase with gas.
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May 6th, 2019, 06:02 PM | #39 |
ninjette.org member
Name: Mikey
Location: Rusk
Join Date: Jan 2019 Motorcycle(s): 07 ninja ex250 Posts: 22
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Need help I had taken a break on the 07 ninja 250 and moved well picked the bike up yesterday and the ignition had been messed with and now I have no powers to anything and no spark any advice I did order a new switch off eBay and will be here soon (I understand I’m going to have to put on a resistor)
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May 12th, 2019, 06:09 PM | #40 | |
ninjette.org member
Name: Simon
Location: Westerly Rhode Island
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