Quantcast
Jump to content


1988 Yamaha Big Bear - No Spark/Won't Start

toolman0114

By toolman0114
in Yamaha ATV Forum

 Share

Recommended Posts

toolman0114 Explorer

toolman0114

Posted
Posted

About 2 months ago I took drove my big bear from the garage and parked it in the shed, no problems. I started and ran great.

Today i tried to start it and it wouldn't fire. i pulled the plug and put it nxt to the cyinder and ther was no spark. I put a screwdriver in place of the plug, in case it was a bad plug, and same thing, nothing.

I checked the 30 amp fuse but no idea what to check next, or how to check it. I highly doubt it's the CDI box, or stator, I don't believe they would just die like that.

Any suggestions????

Link to comment
Share on other sites
  • 2 weeks later...
toolman0114 Explorer

toolman0114

Posted
  • Author
Posted

No I'm really confused.

I tore off the front plastics to check connections, still nothing.

Went out a couple days later to show a buddy who stopped by, and it started right up.

The next day I put the plastics back on but didn't have time to finish, it ran when I was done for the day.

The next day I finished putting it back together, and again it wouldn't start. I reached under the front plactics and giggled the wires and it started, I drove it around the yard and it died. I again giggled the wires and it started and ran, then it died and I haven't been able to get it running.

any suggestions? could it be a loose or broken wire, or could it still be the stator/pick-up.

:aargh::aargh::aargh::aargh::aargh::aargh:

Link to comment
Share on other sites
toolman0114 Explorer

toolman0114

Posted
  • Author
Posted (edited)
Check the kill switch and the wire going from the kill switch to the terminal board. because it kills the spark to shut down the engine.

I see the wires coming from the kill switch, it goes to a 3 prong plug, from there I can't find where it goes. where is the terminal board located? if i pull that wire off the terminal board will that elimanate the kill switch from the equation?

how about this:

from what my wiring diagram shows the kill switch has a black & a Black/white wire. the black goes to ground the B/W goes to the cdi unit. Am I correct to assume the kill switch grounds out the system much the same as a lawnmower grounds out the spark plug to stop it?

If I were to cut the B/W wire where it comes from the kill switch would that eliminate the kill switch? I could always solder it back together.

Edited by toolman0114
more info added
Link to comment
Share on other sites
toolman0114 Explorer

toolman0114

Posted
  • Author
Posted

I FOUND IT! I FOUND IT!!

I pulled the front plastics off again and started giggling the wires one harness at a time, what I found was when I shook the leads going to the key switch it fired, then died. I shook it again and it started, briefly. The bottom plate on the key switch is held onto the main part by 3 locking tabs, the plastic was so dry and brittle that one tab was missing, and the main body was cracked. I pushed it together and hot glued it in place and it starts/runs great. I ordered a new key switch. Thanx for all the help and advice.

This is by far the most helpfull board on the internet.

Link to comment
Share on other sites
  • 8 years later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Forum Topics

    • HSTAR
      1997 Yamaha big bear 350 Shift shaft issue
      By HSTAR
      Hey I have a 1997 big bear 350 4x4
      I replaced the shifter shaft and the shift arm linkage and the rod when I installed them all I was unaware that you had to line the dot on the shifter shaft with the gap on the linkage arm gap put it all back  together and rode it I can't get it to shift in the right gears  I can move the shift cam by hand and goes in different gears but with the shifter shaft in it riding I can't put it in R or N 
      Anyone know how to line up the shifter shaft and the shift cam s
       
    • Mhatayas
      Baja 250, No Spark , I'm stumped ...
      By Mhatayas
      My uncle bought a Baja 250, 2006. Knew there was no spark since the get go. He don't know anything about quads so is getting me to help him try to get it running...
       
      battery is bad so I connected battery charger to it to crank it over , cranks over well , but no spark .... 
      Lights and everything work fine , but with each crank over using the e start switch , the display reads 999 888 777 666 ... Right down to 000 and repeats itself . 
       
      He managed to get a parts bike , I changed over the CDI and the coil and the stator from the parts bike and there was another black box by the voltage regulator I changed over ... I used my multimeter to confirm as much as I could works , it's hard without knowing which wires are which , and I cannot find any diagrams online for this bike ? 
       
      Do you think it could be the Killswitch? There's so many wires coming from there I don't know where to start . Also I should mention it appears the fan on the front of the bike has been taken off (the wires have been cut too ) 
       
      If this bike sparked it would run . The previous owner said he parked it one day and it just wouldn't start after.
    • John Sinclair
      1992 yamaha big bear 350 carburator issues
      By John Sinclair
      I WANTED TO UPGRADE THE CARBURATOR ON MY 1992 BIG BEAR 350, SO I ORDERED A NEW CARB FROM EBAY.  ACCORDING TO THE WRITE-UP IT WAS A GOOD FIT FOR BIG BEARS FROM 1988 TO 1996.  WHEN I REMOVED MY ORIGINAL CARB I NOTICED THAT IT WAS DIFFERENT FROM THE NEW CARB MY CARB HAD TWO THROTTLE  CABLES THE NEW CARB ONLY HAD ONE CABLE.  HOW CAN I MAKE THIS CARB WORK ON MY TWO CABLE THROTTLE?  
    • ethie
      2012 Coleman 500 UT plug keeps fouling.
      By ethie
      Hi All
      I have a 2012 Coleman 500 Outfitter that keeps fouling out the plug within 10-15 minutes 
      not sure where to start
    • Uglyside38
      1988 Suzuki Quadrunner 250 intermittent spark
      By Uglyside38
      I have a 1988 Quadrunner 250 2wd. My brother in law sold it to my son for $20...had been sitting outside for several years. Got it home and had it running in about 30 mins. Ran it a bit and then went to looking at the carb as it was having trouble idling. Was getting it pretty close, then started losing spark...Also, it wouldn't start up every time...only about 1 in 5 tries. Anyway...now, it has what I can only describe as "intermittent" spark. I can get 1 light spark right when the start button is pressed and sometimes one when it's released...but none while cranking. 🤷‍♂️

      I have replaced the spark plug, ignition coil/wire, and traced wires best I can. I noticed a couple frayed wires at the pickup coil where it enters the case. So, now I have the cover off, stator and pickup coil out and trying to test the coil. I do have about 114 ohms resistance for pickup best I can tell. And I can read minute voltage when I drag a magnet across it. Could it still be bad? Can a bad ignition switch/button cause this? (I did have the switch off to oil the choke cable)...pulling rope makes no difference though...any ideas or help would be greatly appreciated!!! It's the intermittent part that's throwing me off! 

COMMUNITY SECTIONS

ATV FORUMS

QUADCRAZY MEMBERSHIP

Be a part of best online community of ATV riders and join thousands of people who love ATVs! Share your ATV photos, videos, ATV rides, get help with your ATV and more. Not a member?

SIGN UP TODAY

ADVERTISE WITH US

FOLLOW US ON

  • Automotive Webmaster
×
×
  • Create New...