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By Dwight Williams
Hey everyone, I've been scratching my head over this for most of the day. I bought a couple of Bayou 220's, got them running (they've both been sitting), and started tweaking and fixing small things. One of them is mostly done, the other had an aftermarket carb on it and I've been trying to sort that out.
Anyway, while adjusting the carb it died a few times, I restarted and moved on until it died and wouldn't restart. I figured maybe I'd flooded it or something - after further attempts I realized I had no spark. Since I have two identical machines I have many parts at my disposal. I've swapped the CDI, spark plug and coil with no luck. I have good resistance readings from the stator and pick up (135 and 110 respectively), I don't have a peak voltage meter but I measure around 53VAC on the stator when cranking. I have a 4 wire stator, not an alternator like the newer ones. Grounds look good, I've checked the kill switch by verifying that it and the ignition switch grounds the black/yellow wire to the CDI. I can turn the engine slowly and see the pickup short the meter as well, seems normal right? So far everything I've checked looks the same on both machines. I've got the service manual and wiring diagrams. Do these readings make any sense? I'm obviously missing something but I'm stumped. thanks!
By Jeff Comstock
Ok, so I had no spark issues and foundy coil was bad. Bought a caltric coil, put it on and fired right up...for bout 20 minutes then it backfired once and again, no spark. I put it on my buddies 300 and it runs. Checked my cdi the same thing, but still no spark. Now I got my old coil and was ohming it and got reading of .01 on primary and 11.89 from POS to plug ( meter set on 20k ) new coil reads same primary but 12.83. what gives? It tests bad but runs my buddies 300, helllllllpppp
I have a 110cc Chinese atv,the harness is in good shape,I recently bought a new stator,coil,CDI,spark plug,came as a kit from Ebay,and I still have no spark,I've watched a few videos from YouTube tried the same steps,but still no spark.... ???? Bad Flywheel??? I heard is very rare for them to go bad,(the magnets in them) I'm gonna check the harness very good again!!! I just can't get spark!!! Any suggestions Please!!!!
By Frank Angerano
Not sure how many of you will remember this or give a crap about it but back in 2016 I picked up my first old atv to rebuild. Yamaha bear tracker 250. I picked it up in NJ while I was out looking for a quad for my little guy since he started this atv thing after seeing a few old pictures of me in my hay day riding.
The person I was getting the 50cc quad had this one laying around and asked if I was interested in it. It was beat up and hadn’t ran in a few years. No spark the guy said and he left it to sit. I wound up taking both bikes.
I wish I had pics but I deleted the original post on Quadcrazy and lost the old ones on my phone when I upgraded.
This was the atv that caused me to stumble upon Quadcrazy since I needed a little help with the spark issue. So needless to say I fixed it, did some cosmetic work and she was good to go. I took it upstate and used the shit out of it for just about everything under the sun. This atv made it through some deep snow, mud etc. I decided to leave it up there and use it as a back up since it’s been about 50 atv’s later and I have newer machines now. But unfortunately it sat for some time and it’s a little beat up so I brought it back home and going to clean it up. Amazing how one year sitting has done so much damage.
This was the first atv that I owned in over 30 years! It’s the atv that brought me here to Quadcrazy where now I endlessly check the site to see what’s going on, who’s talking about what and who can we help with there problem or can help me with mine as well as the on slot of what I do today as a hobby with atv’s. It’s been a great pass time for me and my son with the projects we have gotten and get into. He’s learned how to ride so well it scares me a little watching him. He’s learned how to fix, maintain and upgrade atv’s. He’s insanely good with carburetors as well.
It’s a good thing when a kid wants to play in the garage over his X Box!!
The funny thing about this bike is that when we finished it we thought it was the best thing! We were missing a rack on the front and didn’t care since it looked ok, had no clue where to get parts or how to fix plastics. I was so new to this again since I was staring all over again and now had to remember things and also teach my son!
So we will be tearing into the bear tracker to get her up and running again as well as maybe a few new cosmetic changes and hang on to her for a while since I love this bike. The last two pics are the bike the day we finished putting it all back together and when it was upstate for the first week.
Had no intention of this post going so long. 🤷🏻♂️
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By Gary Ferguson
My old Big Bear nearly left me stranded but I managed to limp back to my garage just before it died. Now No Spark. I’ve changed the obvious, inexpensive and easy parts- spark plug & coil without any luck.
Ive stripped it down and traced all of the related wiring, checking as many connections as I can but no luck again.
Next I pulled the cover and accessed the stator housing to inspect and do some resistance testing to ID a possible short.
Here are my readings:
Source coil- 325 ohms
Pickup coil- 225
Can anyone tell me if these are good numbers, and if good, where to go next?
I assume my next purchase will either be a new stator or CDI, but since neither of these tend to be returnable items I want to be as sure as I can I’m gonna get a resolution to the problem!!
Gary in SC
By Dave Ayoub
Ok i am not quick to jump on a forum and post a question without doing my own part and trying to research and solve the problem myself but I cannot find any definitive information anywhere about my problem. I have a Big Bear 350 that I picked up very cheap which had been sitting in a field for years. I am not new to building wheelers but this one has me beat. After rebuilding top end and replacing the carb it fires right up. The vin has some number worn off from being next to the shifter but from the parts in the clutch i assume it is early since 87 parts seem to be the only ones that match. Thats when the plot thickened.
Reverse works fine but when in the forward gears it would not go past 1st and was hard to get into neutral. ie. a it took a million clicks up to thump into 1 and as many down to find neutral. still never getting past 1st. within minutes i could hear metal screeching and whirling around in the clutch side of the motor. I took the cover off to find that 3 out of the 4 springs on the centrifugal clutch had broken and were shredded. Also the black mechanism that the pawl on shift shaft grabs moves was loose so it wasnt always grab to change the gear on the transmission. I tightened that mech, and replaced the springs assuming it would solve the problem since the gears were not actually changing from the lever and the carrier should obviously not only have 1 spring left.
After putting everything back together it did go into 1st fairly easy but then i again couldnt get it back to N without a million clicks down and couldnt get it to go past 1st. I did one time get it into a higher gear who knows what one but i gained some speed and dropped rpm.
If i jack both the front and the back wheels off the ground and run the motor it becomes much easier to shift and i can get it to run through the gears pretty well. Usually going into N without a huge fight. not perfect but it does hit neutral and roar while spinning the wheels instead of gain rpm and with the power.
I have tried every possible position on the clutch adjustment screw without any noticeable result. I think this could potentially be where my problem lies at this point.
does anyone know if the case is supposed to be threaded? because mine is not. obviously it seems as though it should be since every other bike ive touched has been. i even took the cover off my quadrunner to make sure it wasnt crazy.
when the screw is adjusted and the jam nut tightened the screw will just slide back out since there is no threading in the case. accomplishing nothing.
Does anyone have any insight on any of this? Are my plates stuck, Centrif clutch worn out, case stripped or something else crazy im over looking?
By Wolf Studios
Hi guys so I'm looking for any help or advice with a yamaha big bear 350 1997 (i think) it's fairly dirty and just been say for many years, boss says it's a non runner and I've tried and it will not start, ideally would love to do it up and get it running but have been told the engine has gone, cannot find a new engine anywhere. Anything I should check first before just taking the entire thing apart?
Working on my oldest son's buddy's 2000 Big Bear. He was having some power loss at WOT so i thought it worth while to clean the carb and put at kit in it...or at least clean the OEM jets and use the new orings that come in the kit. It starts and idles like a champ, but dies and wants to backfire with any throttle at all. I assume lean because it will run decent with the choke on. Air screw adjusted fine, nice crisp idle. This one has fuel/air screw, low speed jet, mid jet, and main jet. I was assuming just trash in the low speed circuit so pulled it and cleaned again, still does the same.
Two questions I guess:
1. Does it sound most likely trash in the off idle circuit? This one has a few more passages and jets than I'm used to...and a darn diaphragm.
2. It now really wants to leak at the bowl drain screw. It doesn't seem to tighten enough to completely stop the flow. Seat looks good, screw was dirty but cleaned up fine with a touch of 2000 grit paper. First for me. Any idea here?
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