Big Bear 350 Rehab - Part 4: CDI and Stator Troubleshooting
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- เผยแพร่เมื่อ 17 ธ.ค. 2020
- What a long, drawn out mess! In this installment of the project, we finally make some real progress. I go through the process of troubleshooting the CDI and stator, diagnosing the issue with the timing advance, and how I (FINALLY!) resolved it. I'm happy to say that the bike is now running like it should be!
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![HOW TO TEST A STATOR / WHAT IS A STATOR [step by step] GY6](http://i.ytimg.com/vi/VoXYzQ61tRM/mqdefault.jpg)
![HOW TO TEST A STATOR / WHAT IS A STATOR [step by step] GY6](/img/tr.png)
Great.job, never quit! That was a tough diagnostic.
Thanks for the video! I have a 87 Big Bear 350 and its been down for almost 4 years have replaced Carb, CDI, Coil, Peacock, Fuel Lines, did a Valve job, checked the timing and now have bought a stator and waiting for my Mechanic to swap it in, hoping this will solve the problem! I bought this new and have it set up for doing jobs around the farm and really need it ! from watching your video mine ran just like yours did( no top end)
Seriously impressive stuff! I have to say you've made the most interesting big bear 350 videos on TH-cam so far, I really hope you fix up the other bike too.
Thanks for the kind words! And thanks for watching.
Great information, thanks hoss
Thanks for watching!
You don’t have any back pressure from the exhaust pipe. Weld a plate over the the end of the pipe and drill a 1/2 inch hole in the plate. Ooops didn’t realize you put a proper pipe on it. Good job figuring it out.
Bridge the brake switch on the left side handle bars, fallow it down and unhook it. After that connect the 2 wires you unhooked together but not the wire from the switch, the ones that are part or the wiring harness
very useful i appreciate you!! thanks..
You're welcome!
Hi again, apologies for my comment in part 3 as I didn't realise there was a part 4 where you had solved the issue.
My issue persists whereby my 92 big bear struggles to start (occasionally backfiring ) and takes an awful lot of cranking to eventually start and when it does start it is a weak idle/firing. When I open the throttle is goes well. But it struggles to idle and the plug lands up sooted indicating that it is running rich. I am assuming the backfiring when trying to start is flooding. Are you able to tell me how to adjust the carb to idle less rich ? I can only see the fuel mixture screw which is a pain to adjust with the carb on the quad. Is there an air mixture screw or am I missing something? Great informative videos by the way!
That mixture screw is the only way that I know of to make any adjustment to the air/fuel mixture, unfortunately. After fooling with mine for so long, I ended up buying a replacement carburetor and once I got the ignition timing issue resolved, it has been running well.
Make sure you check compression it's because of valve lashes right doesn't mean a valving leaking and if a valves leaking compression it'll never have any power
Great job man Great job on the video I stand corrected on the exhaust just awesome
My grandson is having the same issue with same exact bike color and all
Hey I just got this exact quad. I have some very small things wrong with it such as the gap in the small boot in the rear axle. You had this exact problem in your pt 1 video. Do you know where I can get a replacement? I also am trying to find a pull chord but having trouble finding a handle that will fit snug with this engine.
They're great bikes! Not a real powerhouse but a good reliable workhorse.
I ended up ordering the boot I needed from Partzilla.com. It's supposed to arrive by mail today, actually. I didn't look to see if they had pull start parts or not, but that'll be soon to follow on mine are well. Mine had all the parts but the pull start was full of mud and rusted the spring in half.
Good luck with your project!
@@diymechanictv1233 thank you. Did you ever fix the fuel leak issue. I have the same thing. Also to replace the boot don’t you have to take the entire back half out?
Yes, the back swing arm and axle have to come off the bike to replace this boot, but it really doesn't look to be that big a job. Maybe I'll shoot a quick video on how it is done.
I never really saw it leak fuel. The PO said the petcock leaks, but I've never seen it leak once, so who knows...
Have you tried checking the diaphragm in your carburetor or replacing it it's only about a $10 part and it really acts like that's what the problem is
I'm sorry I should have watched to the end of the video
Why not make a series on getting the parts bike running? Keep up the good work👍
That's an idea I've toyed with some, actually. We'll see what happens when I get the truck done.
Hey are u going to fix your parts bike
I bought a cheap cdi and wired up for $9 got a spark but the timing seems off you no if the old CDI has built in timing advance and maybe mine new one doesn't
That's sure what it seems like to me. That or you have the 2 pickup coils and the CDI is connected to the wrong coil.
man I am glad I found this video. i have an 87 350 and it only fires once on the 1st rotation. then again after the key switch is reset. my pickup coils are in spec 192 but source is 325 which is close to 330. any thoughts any help appreciated
I'm not an expert on these, but it sounds to me like the CDI would be a good place to start.
I am also working on a 1989 350 big bear, and have the same issue, sparks once then nothing, shut key off , turn back on, push start button engine turns over sparks once then nothing. Bought cheap caltric stator, cheap cdi and a Ricks coil. Still sparks only once. Do you have 2 trigger coils? Do you have 3 relays? Is it the cdi that switches from basic timing to advanced?
@@fjb6576 have you disabled the park brake sensor. They fail all the time. Basically the park brake sensor goes bad and acts as a restrictor.
did u figure it out man ?
Also you're exhaust could be stopped up that will cause that too big time try taking your muffler off and running it
It's the rectifier shure of it
Question for you does your exhaust pipe coming off the engine still glow red hot after fixing the cdi and stator?
No it doesn't. I think that the ignition timing was way late so it was ejecting fuel that was still burning through the exhaust. Runs a lot better and much cooler now that the ignition timing is right.
Im having the same issue with mine glowing red but now my machine is stuck in reverse after pulling a few logs any recommendations?
when you pull that carb off again,you should be able to disconnect the throttle cable at the carb. just pull the throttle lever in the carb back and slip out that little brass retainer at the end of the wire and it will just fall off so dont lose it. then you unscrew the nut just on the outside of the carb and the wire will pull through
Sounds good, I'll have to try that if I take it off again.
@@diymechanictv1233 just installed my carb after a cleaning and carb kit install. Half the parts weren't correct but was able to use the orings and seals with the original parts. I'm having a hell of a time getting it run smoothly. Any adjustment suggestions?
I thought you said it idled rough?
What would cause a 1995 to cut out low-mid rpms. Revs fine in neutral but once in gear it has no power and will cut out or miss until i get up enough speed than it will be alright once im in the high rpm range. I had my carb gone thru and everything is clean. It dosen't smoke or dosen't backfire.
I have the exact same problem.
@mikechapman599 replacing the pickups in the stator solved the issue for me.
@@mikechapman599 mine was a cracked intake boot. It wasn't even noticable when looking at it but sure enough when i goy it appart it was split in 2 pieces.
Thanks, guys. intake boot is brand new last year. But I will double-check that.. it may be the pick-up
Do you know would case a big bear to have loss of power I have rebuilt the carb and checked timing and other stuff just cannot figure it out
Does the exhaust get like stupid hot? Like practically glowing?
@@diymechanictv1233 no. Could the stator or the magneto cause that problem
It did on mine! The timing wouldn't advance as the RPMs increased.
@@diymechanictv1233 I am confused on what you are saying
Mine would idle fine but had no power above idle because the ignition timing wasn't changing like it should.
If you still have cid box ill buy it, i need it bad!
Keeping this one as a spare, but thanks anyway.
Souds like the carb
That's where I started...but not what it ended up being.
For the boggy throttle Check the diaphragm of the carb make sure there is no holes or rips. This was the case for me
@@marc2109 did your big bear do it under a load? Mine has power but it will cut out ridding at lower rpms-mid rpms. If im at really high rpms it will be totally fine and i can do 70kmh easy. No loss at power up top but when its struggling or at the beggining of each gear it will cut out. I am thinking of the stator being bad.
Brother you ain't got a spark problem You got a fuel problem now you need to check your compression and see what it is I'll tell you if it's the valves and the rings it ain't smoking so I wouldn't think it would be rings but it could be the carburetor it's definitely a fuel problem now some of them had a slight adjustment you could turn on that stator loosen up and turn it left or right and that could be out of whack
Setthe vavls
Yeah that's for sure You're you're mufflers clogged up that is 100% fat it does the same thing on a car when a catalytic converter gets stopped up that thing will have no power it'll fire up but it won't have any power and the thing will glow red You're exhaust is stopped up for sure
I love NE Ohio Dover
Compression
I’ll give you $300 for the blue bike,,,,
I bet you would!