Yamaha 450 grizzly ATV no start diagnosis and repair
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- Опубликовано: 5 май 2020
- In this video something a little different, I recently done some diagnostic and repair work to the farm atv, it was a crank no start condition, I had fuel, spark and compression but still no start, I did repair it successfully so I hope some of the tips I give you can help someone else out if they have a no start condition on there atv.
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Excellent work! Exact same thing happened to my BB400. I suspected the flywheel. You confirmed what it was. Great job explaining the steps you took and the results you got! 👍
Sir you saved my buddy that's about to retire a good amount of money on buying a new quad. Thanks. Total of about 10hrs in repair
Glad it helped you out, my landowner friend was going to junk this atv but it’s still running strong today.
Thanks for the video.
Have a '90s 350 BigBear with no start. Compression is there. Have had carb, cleaned and rebuilt. Strong spark. But no start. Beginning to think its timing and possible woodruff key as well.
Thanks that was great advice, my 2003 Yamaha Kodiak 450 had the exact issue. Did all the same trouble shooting everything was fine. Bought the new woodruff key along with the gasket and flywheel puller and the key was split in half. Put it all back together it fired right up...thanks again.
Glad it was helpful, when I fixed it there was no info I could find on a broken key being an issue, thanks for watching.
Man ur video saved me so much screwing around exact same thing on my 450 kodiak just popped her off thanks man!
Glad it helped you out.
Your video just saved my atv from becoming a parts bike, very informative sir and much appreciated..
I’m glad it helped you out not scrapping your atv. Took me a little bit to figure this one out.
Thank you for your help I got it running ok
Great video. Buddy of mine might have sheared this key while trying to pull a broken sled across the yard🙄 now we have to dig in lol
Hope you get it back running
Thank you so much this really helped
Great video
Thanks for the great video. I just had the exact same issue and have it fixed now. I made video to post but im giving you all the credit. Thank You
Glad it helped out.
Nice fix bud. Good to know.
I would have sank to my knees weeping quietly :-)
Thank you sir! That was it👍
Glad it helped you out
Clever 🤔, I would have never been able to find out what was wrong with it, let alone fix it 😂!
You just have to be smarter than the machine and understand how it works
Thanks for watching, good luck with fixing your atv.
Best video ever.. going to trouble shoot mine thats been park for awhile
wau. I had also broken flywheel key in my Yamaha 450 grizzly. But it can affect valve timing? I don't understand now. doesn't the position of the flywheel only affect ignition timing?
Does the flywheel just get pushed back on and than later tightened with the boltfor the pullcord assembly?
Did u use a rubber mallet or anything to seat it on the woodruff key? Doing this same fix on my wife's bike right now :)
You can tap it back on with a rubber mallet just make sure it goes on square, crank bolt holds it in there’s a torque spec for it but you will have to check what it is for your bike.
WOW does that thing ever have a bad knock.
Fun
Nice
It starts after awhile but it makes a noise coming from that area
Hi... can u share me the electrical diagram? and the main manual please? I have the same yamaha
Hi I’m fairly sure I have the same issue can I check the piston is at tdc by measuring it by removing the spark plug and checking when the piston is at its highest point then check the ignition timing is at tdc also or do I have to remove the timing chain cover
You can remove the spark plug and use a skinny screwdriver in the hold to see when the piston is at tdc, there’s a sight window plug at the crankshaft, I show it in the video you can check the tdc timing mark through the window. There will be two marks one before true tdc that’s a spark timing mark the other one is true tdc.
@@huntnfishnuts5880 thank you so much for the quick replie
that key does not actually hold the flywheel in the correct position. It's just a mounting aid. The flywheel is wedged into place with that bolt.
I have a 1999 big bear 350 that seems to have same problem I'm not sure tho I'm not good at this stuff an only timed 2 cars in my life an it took me all day on that but besides that Iv took the timeing cover off top side an lind it up on mark seems good but didn't know about the crank timeing mark so it could be off there it has spark an has a very hard snatch back when trying to pull crank it. With pull cord like rip your hand off snatch back an when but it has always had that since Iv got it but it would crank an run good with 1 good pull some times 2 but it seems last time I rode it it ran good I switched it off an have field to get it to run again starter button don't work have to jump silonied so I just used crank rope ever since I got it an the man that I got it from helped me put new cdi an instater on before I left with it like I said ran good till I switched it off an since it's don't what ever it seems the starter engages at times when pulling the crank rope it snatch back an then when I pull it it wines an really stiff to pull like the starter is stuck engaged I like help to figer out what I need to do to fix it please an thanks for grate video to help with the woodruff key an the timeing makes on flywheel
There will be one mark on the cam at the top for the cog and the crank will usually have two marks one for mechanical base timing and one before top dead center for spark timing, you need to check your chain at top dead center so if your cam is on you should be able to see the top dead center mark on your crank in the sight window, if you cannot then it’s not in time. You have to check where the marks are for your particular machine as there all a bit different. Check your basic stuff first, spark then fuel then compression, if you’d timing is off your compression will be low.
@@huntnfishnuts5880 thanks for the evice I ain't got around to checking the timeing mark on the flywheel but on cam it lines up on the mark an the timeing chain seems good an tight no slack or marks or stiff links that I could tell or see it is getting spark an seems to be good compression to it I ain't checked with a compression tester yet tho I'm see tomorrow if the timeing mark is in line on crank an cam an go from there on it I was thinking at first it may be the carburator it bad cuz it's in bad shape on inside has broke float in it too I cleaned all jets out good an clear see throw them all but the adjustment screw in it won't move or can't get it out cuz the grove for flat head is broke off it looks like so I was looking for a carburetor for it but can't find a ome one for it anywhere an here bad things on all the aftermarket carburetors
@@justinerkhart4611 if you think it’s fuel just try some starting fluid, if it starts and dies you have a fuel delivery problem, check you have flow to the carb after that make sure your bowl and carb are clean,
I did and it is not engaging the magneto
Where's the other video
Hi I did all that and my starter just spinning not turning the magneto I am stuck any ideas please
The Magnitogorsk will not turn its mounted to the inside of the case. The starter should engage the flywheel edge to start the bike. Check the engine is not seized, it should turn when you pull the rope, if the starter clicks and does. It turn you may have a bad starter solenoid, try tapping on the starter to see if it starts to work while pushing the start button. Check you have proper voltage at the starter should be the same as battery voltage. You may have a bad starter , make sure it’s aligned properly with the flywheel. Take it off the bike and bench test it put power and ground to it and see if it functions. If the starter won’t work try starting it with the pull start.
Probably bad one way bearing and the magneto does spin it's the flywheel or another name for it the stator is attached to the case and is stationary but If you have a good flywheel key I would say that one way bearing or gear check all gear clearances.
great vid maybe its just the video but that ticking sound is way way louder then my 421cc wolverine
The exhaust manifold has a small leak but the engine is fine, the camera makes it sound worse than it is, thanks for watching.
Do you riegue the bolt that holds the magneto
Yes I reused it, I only replaced the key and the gaskets. It’s still running just fine today.
@@huntnfishnuts5880 how tight do put the bolt on
Do you need to torque it
@@reymondrodriguez342 you should torque it to proper spec so it will not loosen.
@@reymondrodriguez342 that bolt in the middle of the pull start that goes through the magneto gets torqued to 36 ftlbs
My kodiak 450 would not start and it back fires what can it. be
Might want to check your timing, also check that your getting proper spark
@@huntnfishnuts5880 thanks
@@reymondrodriguez342 start with the simple stuff first, check spark, check your fuel, make sure your getting fuel. If you pull the spark plug and it’s wet with fuel it’s flooding. You might not begetting spark, check the compression, if it’s low it’s out of time or you have worn valves or piston rings.
got a 2021 kodiak grizzly 450 that wont start either, has a code 12. Wonder what it would be?
I'm here now for my confession. After I let a kid start up my Kodiak for fun, it later refused to start. I checked everything - connections, switches, fuses, battery, grounds, relay, even regulator. NO LUCK. Then I sat on the quad and tried to remember what he might have done while sitting on it. Then I discovered a very small button I NEVER KNEW EXISTED under the starter switch - the engine kill switch. So after replacing the solenoid and almost submitting to a mechanic for help, I found the problem. The kid had hit that button by accident I never knew it. I told my wife I had finally found a loose plastic wire connector, so we'll leave it at that.
Haha I used one. Of my neighbors quad when his cattle got out and turn off the quad with this switch he later called me and said I broke his machine I went over to look at it and started it right up! He was flabbergasted lol I showed him the switch
Ok maybe I have it to tight
Hey man I just saw your video and I have the 400 version and it sheared the woodruff key and I replaced it and still can't get it to fire do you think the timing is somehow off now and if so how do you even fix the issue I'm stuck and clueless I checked everything except timing I was fortunate enough to find sheared woodruff key video and found it sheared and changed it but I still can't get it to start so I'm guessing checking that all the timing marks line up is my next step but I'm absolutely new to this timing crap and would so appreciate the help big time. Thanks please help hahaha
If you changed the key you had to have taken off the timing chain, when you install the crank flywheel there’s a timing mark on it you have to see through the sight window, take the timing cover off the cam and make sure the cam timing mark is lined up with the case mark and the flywheel mark is in the window, if not you have to remove the case cover and set the chain so the marks Line up properly.
@@huntnfishnuts5880 do you mean by removing the tensioner bolt and spring and then pulling the cam gear off and turning it till the lines match up and then putting the cam gear back on if they aren't lined up and that should fix the issue? I'm guessing they can jump time when the key shears off ?
@@420banshee7 both the cam and crank are keyed on so they are fixed once installed line the marks up on both then install the chain then the tensioner last, set the chain tension recheck your marks then rotate the crankshaft clockwise with a ratchet for 2 revolutions then recheck your timing marks if they still line up your timing is correct if not adjust the chain until they do Lind up turn if again and recheck, once correct make sure you have spark and fuel.