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By RGS
1989 Moto 4 YFM350ERW intermittent spark.
Quad has set for about 7 years and was running when parked. When I replaced the battery and attempted to start it had no spark.
What I have done. Followed troubleshooting in the manual.
1. Coil failed the resistance check so I replaced it. Still no spark.
2. I performed resistance checks on the stator and they all pass.
3. Found a bad rear brake stop switch and unplugged it and connected the wires in order to disable. Now I have intermittent spark. I believe that the issue is with either the stator or CDI and not sure which.
1989 seems to be a transition year for electrical. I can get new aftermarket CDI units for 87-88 and 90-94. I cannot get ones for a 89. I can get new stators for 87-89 and 90-95. Looking at the schematics the wiring on my moto is closer to the 90 ones on the ATV side of the CDI and closer to the 87-88 on the stator side of the CDI. Looking at part supply sources the stator housing is the same part # for all the years and looking at some of the stators on Amazon that have the dimensions on them both of the stators are the same size.
What I am thinking of doing is to replace the stator and CDI with a 90-95 one as these parts are all readily available. Does anyone know if this has been tried before and if there are any issues with doing this.
As a side note I also have a 1993 Moto 4 YFM350ER that has been sitting longer but it is located about 400 miles from me at this time. By doing this change in addition to being able to get parts I will also have 2 ATV’s that are the same electrically.
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By Mikey69
Heres my story. Kinda long. I guess I was a late bloomer when it comes to quads. I had never ridden a quad in my life. Rode Dirt Bikes as a kid growing up. Back in Oct of '06 I found a Mustang on craigslist. Took it for a test drive one morning before work. Fast car. 351 Cleveland. I had planned on meeting the guy again after work. For some strange reason thats still to this day beyond me, I stopped in Hillsboro MotoSports on the way home from work. I had 6 Grand on me. There was a left over '05 sitting by the front door. It was on sale for $4999. It was $5499 OTD. I didnt even look at anything else. I knew nothing about quads accept I thought it really looked coool and I had the money in my pocket to buy it. I was sitting on it when the salesman walked up and asked... "Can I help you?" Without hestitation I pulled 60 Ben Franklins outta my front pocket and said "I want this Quad. Load it up in my truck." It was just about dark by the time I drove away from the shop. BTW, I didnt bother to ask my ol lady if I could buy it. LOL. Anyway, I took it by the house and showed her. She was kinda stunned but not mad. We drove over to a friend of mines house and unloaded it. I took it to the field across the street from his house. HOLY CHIT!!!!! I was surprised by the power. I had it for about 2 weeks and took it to Sand Lake. I was there a few hours and rolled it on a banked turn at the top of the bowl right before you get to the one-ways. When it rolled, I flew off and landed on my belly. The quad came bouncing and landed on my back. For a month I couldnt even walk. I was scared of it. I considered trading it for a 250EX. Went back to the shop. The salesman said..."Dude!!! You dont want a 250EX!!! Trust me. Just get used to it" I still wasnt convinced. I put it on craigslist for $4000. Calls were coming in. I had a guy that wanted to come look at it that evening. I decided to take it for one last ride at Browns Camp before I sold it. I was still afraid of it. After about 5 minutes I started feeling comfortable on it again. I decided right then, I loved my Honda 450 and would learn how to ride it instead of selling it. That was late Nov of '06. Work was slow for a Painter in Oregon. My new job everyday? Going to Browns Camp and ridding my Quad. I bought my Girl Friend an '02 Blaster. I rode my 450 for 4-6 hours almost every single day for 3 months. And yes, I know my way around Browns Camp pretty well. LOL. In March I bought her an '06 TRX250EX (Thank God I didnt trade my 450 for one of those) LOL Since then, I have become totally addicted to quads. I love them. Couldnt imagine not owning at least one quad. Luckily I have two. My "07 was $6500 OTD in July of '07. Bought it for my Girlfriend. Traded in her 250 EX. A month later we broke up. So, I wound up with two Honda 450's.
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By Arizona
I recently bought a 87 TRX 250 not running of course, the owner had a brand new Key Switch on it.
I think it is the wrong one or wrong wire colors as the colors dont match up with wiring diagram i downloaded for it.
anyone have a pic of their ign switch wires where they connect with the wire colors for that model? I ended up leaving the black/w stripe and
green wire disconnected in order to hot wire it for other testing but would like to know as the colors dont match diagram.
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By oxidized_black
these are what i have in my collection ... always looking for more
1985 - 1995 Polaris All Models service manual
1996 - 1998 Polaris All Models service manual
1996 - 2003 Polaris Sportsman & Xplorer 500 service manual
1996 - 2003 Sportsman 400 & 500 ~ Xplorer 500 service manual
1999 - 2000 Polaris All Models service manual
2001 Polaris 90 service manual
2001 Polaris Scrambler 50 ~ 90 Sportsman service manual
2001 Polaris Sportsman 500HO Parts Manual
2001 Polaris Sportsman 500 Parts Manual
2002 - 2003 Polaris Sportsman 600 & 700 Servive Manual
2002 Polaris Sportsman 700 service manual
2003 - 2005 Polaris Magnum 330 service manual
2003 Polaris Predator 500 service manual
2003 Polaris Predator Parts Manual
2003 Polaris Trail Blazer 250 service manual
2003 Polaris Trail Boss 330 service manual Part I
2003 Polaris Trail Boss 330 service manual Part II
2003 Polaris Trail Boss 330 service manual Part III
2004 Polaris Predator 500 Owner's Manual
2004 Polaris Sportsman Owner's Manual
2005 Polaris 400 & 500 Sportsman service manual
2005 Polaris 700EFI Owner's Manual
2005 Polaris 800EFI Owner's Manual
2005 Polaris Sportsman 400 Parts Manual
2005 Polaris Sportsman 500 Parts Manual
2005 Polaris Sportsman 6x6 Owner's Manual
2005 Polaris Sportsman 700EFI & 800EFI service manual
2005 Polaris Sportsman 800 Twin EFI Parts Manual
2006 - 2007 Polaris Outlaw 500 service manual
2007 Polaris 700 800 800x2 EFI service manual
2007 Polaris Ranger 700EFI 6x6 Parts Manual2007 Polaris Ranger 700 4x4 & 6x6 service manual
2007 Polaris Ranger XP 4x4 service manual
2007 Polaris Sportsman 450 & 500EFI - 500X2EFI service manual
2007 Polaris Sportsman 700 800 - 800EFI service manual
2008 Polaris Sportsman 500EFI & 500x2 service manual
2008 Polaris Ranger 6x6 700EFI Parts Manual
2008 Polaris 800 RZR service manual
2008 Polaris Sportsman 700x2 - 800EFI - 800 Touring service manual
2009 Polaris 850HD EPS service manual
2009 Polaris Outlaw 450 & 525 service manual
2009 Polaris Outlaw 90 service manual
2009 Polaris Predator 50 service manual
2009 Polaris Ranger 2x4 service manual
2009 Polaris Ranger 4x4 Crew service manual
2009 Polaris Ranger 500 2x4 service manual
2009 Polaris Ranger 500EFI 4x4 service manual
2009 Polaris Ranger 500EFI 4x4 service manual
2009 Polaris Ranger 700 4x4 Crew service manual
2009 Polaris Ranger 700 4x4 service manual
2009 Polaris Ranger INTL service manual
2009 Polaris Ranger RZR 170 service manual
2009 Polaris Scramber 500 service manual
2009 Polaris Sportsman 300 & 400HO service manual
2009 Polaris Sportsman 450 & 500X2 service manual
2009 Polaris Sportsman 500 service manual
2009 Polaris Sportsman 6x6 800 service manual
2009 Polaris Sportsman 800EFI & 800EFI service manual
2009 Polaris Sportsman 550XP service manual
2009 Polaris Sportsman 850XP service manual
2009 Polaris Trail Boss - Trailblazer 330 service manual
2010 Polaris Ranger RZR S service manual
2011 Polaris Ranger RZR S service manual
2011 Polaris Ranger RZR SW service manual
2012 Polaris Sportsman 400 service manual
Visit the Polaris service manual Section: https://www.quadcrazy.com/files/category/7-polaris-atv/
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