YZ250 Has No Spark - Troubleshooting = Problem Solved
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- Опубліковано 25 лип 2024
- This isn't exactly a how to, but this is how I tested/troubleshooted (troubleshot?) and diagnosed why my 2017 yz250 lost spark on the line at Oakland Supercross Futures • Supercross Futures Oak...
I have never tested electronic components on a dirt bike before but it wasn't too hard thanks to the owners manual. If you have any questions feel free to ask.
Here is the Rocky Mountain video I used as a reference
• How To Test a Dirt Bik...
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You seem like a cool dude, down to earth. I fix this stuff for a living but I'm right there with you on the electronics! Not my bag of tricks man. I just put my 87 yz250 back together after sitting in totes for 10 years and gave it a few kicks last night with no luck so I will be out there testing spark today. Wish me luck brotha
Bud DePetris thanks man. You got this! Just follow what the manual says and you should find your problem.
@@KevinPersonius I hope so! It's been put on the back burner for a long time. Im hoping I got it all back together right after all these years
@@buddepetris5472 did you find the problem? I’m working on an 88’ wang to see if it’s a common old bike thing
@@Goon_Toob i’m currently doing an AF swap with a 87 yz250 into a brand new kawi 250 f frame. I have no spark. And cannot find a stator, any idea where i could get something like that for that old of bike?
@@KevinPersonius was it the stator
Good job man. Glad you found the issue.
Thanks bro!
Thanks for making this video! Great job
Great video, helped me out alot!
I know it sucks, but you should feel lucky you found the problem pretty quick. I've seen guys pulling their hair out trying to chase down electrical issues...testing, re-testing, swapping parts in and out, running the harness looking for shorts etc. Good Job! Looking forward to seeing it fire up in your next vid. Actually...can you kick it over with your injured foot? Might have to get a designated kicker :)
Thanks man. I was worried it was gonna take me a long time and spending lots of money replacing working components but I got it first try. Lucky I ride 2 strokes and they have a lot less wiring going on than the modern FE 4 strokes.
I did get on the bike and try to kick it but that was a bad idea! It hurt and I couldn’t even give it a full kick. I tried to get Kari to kick it but she’s just not strong enough.
I have most over part 2 filmed but I felt like I gave some bad advice as far as ignition timing so I’m making a spark plug dial indicator to make sure the timing is correct for sure before I start it.
Looks like you'll have to get a friend to "guest star" in the vid and kick. On the lookout for the next vid!
LSForce10 thank you! I planned on already having it up but I wanted to add some stuff to it first. I’m having a hard time staying motivated with my leg. I get lazy lol
So did a new stator fix the problem?
Could you please help me. I've watched both your videos and saved. But does a 2015 yzf 250 have this. As I can't find part online lol. Thanks
Legend man thanks
Great thanks - Helped me test the ignition electrics on my daughters CR85. Seems like its the coil ! NIce bike by the way !
John Gittins thanks man! Glad I could help out.
Thanks. My coil test reads 0. All the rest spot on. Every wire harness connector was encased in dried mud, boots did not do shit to protect them. Don't ever buy used woods bikes. I'm heat shrinking and rtving the clutch cable were it goes into the case. I can't imagine having more wire connectors on a dirtbike your jumping on, to much room for failure if the shit cuts out on you.
I have a 1982 Suzuki sp125 that will only spark for two kicks then nothing until you let it sit and come back to it. The it will spark a couple times and stop again. Anyone have any ideas?
Mountain Smoke Garage loose ground connection somewhere? Maybe start testing components when it loses spark and see if you can find the culprit.
What repair manual are you using haynes, chilton? Its very detailed and has good pictures
It the Oem Yamaha manual that came with the bike.
I really need a 2011 yz250f 4 stroke , if anyone knows where I can get one ??
Im having the same problem on my 98 kx250 i hope the ebay stator works they don't look exactly like the original but they say its a direct plug and play replacement
Did u try that new stator?
I have same fucking problem won’t start!!
@lojzabeats4705 I did and it didn't work I had to buy a used one and the used one worked perfectly don't buy anything but the oem one hope this helps
I read where the factories are removing the wiring harness before washing? Diselectric grease and silicone should fix this problem. Yea I tore this whole motor apart this weekend customer said it just locked up. Turns out the guy he bought the bike from didnt torque the nut on the generator wheel. So wheel is gone, I also think it had the wrong key in it. Lucily thats all that was wrong!
ryan menke I haven’t heard of them doing that. I do know they strip the bikes down to nothing after a race weekend. Dielectric is a good move for those connections though.
Hello, i have a 2011 yz250f 4 stroke, i pulled the cam box off and in pulling it of my socket adapter fell into the piston chamber. So. To remove it should i pull out the bolts to the celender head and pull it up high enough to retrieve the adapter?? Or is there a better way that you know of ???
If you still have the head on I’m not sure how it feel into the cylinder. Did it fall though the intake or exhaust ports? I’d try to fish it out with a magnet if it’s sitting on top of the piston.
It's the top cover the one you take off first to get to the timing chain and cams. I was taking the lastbolt out ,that's when the mini socket adapter came off and fell in , belive me I'm not happy about it either but it happened. Now I need it out. I'm pulling the head up just enough to look for it and get it out , I need to order a carb kit for it to, also the bucket , shems for the valve buckets
The hole under the spark plug hole is to small, can't see nothing but I did look in the exhaust and nothing there.
So I'm pulling the next one , just enough to locate it, and go from. There
@@charlesjohnston9067 get a small magnet the a swivel head and see if you can fish it out
Hey man, im having problems with something electrical that im not sure of, bike was recently rebuilt from top to bottom and i mean everything was changed internally. Bike runs doesn’t start. Bought a new stator and BOOM starts right up, i leave the bike for two weeks and now it doesn’t start. I unplugged the brand new stator and plugged it back and BOOM again it started. Not sure what i should be looking for now, its definitely something electrical, do you have any tips on what i should do/change?
honesty man I have no Idea. my best guess is the the connectors are dirty or corroded since the problem is intermittent. either that or maybe a loose/bad ground.
@@KevinPersonius Damn...finding the exact wire is gonna be a problem...mind aswell change every wire.
@@EarthWasHere I meant check the connectors where they pug into each other.
I have a crf450 ,my sparkplug is live but bike won't fire
Short-cutted list for an engine to run is
1. Air
2. Fuel
3. Spark
But that's actually not correct.
You actually need
1.afr (air fuel ratio)
2. Ignition at timing (spark at the right enough time)
3. Compression
Assuming your spark looks healthy and bright, (so then it's not a bad stop switch, because you have spark)
Afr:
If you have way too much fuel or way too little, it may not even try to fire.
Turn off your fuel, drain your float bowl, then try spraying starting fluid into your air intake. Starting fluid has a much wider range of explosive afr, so it's not as picky as gas at starting.
If your engine runs on starting fluid, then you have a fuel issue.
If it won't run on starting fluid, you either have a major timing issue or a major compression issue.
Timing could be a bad cdi, bad stator/magneto, flaky wiring connection or stop switch, or a shattered key on your flywheel/magneto showing it to shift and change your timing (very common with lawnmowers and chain saws, causing them to fire backwards and rip the pull cord from your hand).
Compression:
if air can't get in or there is an opening so pressure can't build, then your engine won't run. do a compression test (buy it borrow a compression tester). Remember to use full throttle for the test.
Could be as simple as a broken reed valve (2 stroke), 4 stroke cams/timing at wrong angle so valves open at wrong times (either by mis-instalation or more serious timing chain slipping), broken or stuck valves (4 stroke) or something like bad rings, a hole in a piston, damaged cylinders, etc.
Luckily book have a pictures 😂
let me gues stator wheel came loose and spun?
ryan menke nope. It shorted out somehow. Maybe I got a little crazy with the pressure washer. You could see where it arced out.
ryan menke that did happen to my buddies 18crf 250 though.
So did a new stator fix the problem ?
Clint p yea it did! Only I couldn’t start the bike with my broken leg lol. If your yz250 doesn’t have spark and you need help finding out why DM me on instagram. @kpersonius264 I took notes once all the electronics if you need help.
@@KevinPersonius
Awesome, I have same problem, no spark. Did all the tests like you, only thing is the same test where yours failed, mine did too, except instead of a low ohm reading i got a 7.43 megaohm reading. So looks like a new stator is in my future.
Thanks for the video!!!!
Awesome man. I’m glad it helped
@Caespa check you coil, sparkplug boot, kill switch could.be bad and look for any wires that may have rub ed though and grounding out to your frame
never use a pressure washer on a bike, water can get past your seals and start developing rust
Got bored to much talk
It's called explaining yo
You talk too damn much you talk too damn much