Quantcast
Jump to content


Baja 250, No Spark , I'm stumped ...


Recommended Posts

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.

Link to comment
Share on other sites

You need a battery too. That dash display going screwy is because the voltage is dropping too low when you are using the starter. The charger isn't supplying enough power to run the starter.

If it cranks too slow because of not enough battery power then it might not make spark, and if the cdi uses 12v it won't work at the very moment it needs to, just as the piston's coming up on compression stroke and the dash dies.

Link to comment
Share on other sites

I had the battery charger set to 20amps , it seemed to crank over fine but the display still spazzed out . So just yesterday I found 2 potential reasons why there were no spark . A blue wire coming from the stator that connects to the CDI , one of the connector pins was pushed back . I fixed it with some needlenose plyers , and the next thing I did was check for resistance between the coil and the plug cap with multimeter. One didn't have any resistance and the other did have resistance, so I put it back together, and wait a go ! Spark . Put a small bit of fuel in the piston just to hear it start up . I now drained the gas as there was water in there ,next I'm gonna clean the carb up before I actually take it for a run ! 

Link to comment
Share on other sites

Good work finding the pushed back pin..

Time after time it's the wires not the electronic bits.. or Switches.. That flickering could be a key switch, or perhaps the kill switch, with dirty contacts. I'm pretty sure the flickering will be because the voltage to the gauge is dropping below the about 5volts the internals of the gauge usually work on.

Link to comment
Share on other sites

  • 2 weeks later...
On 4/21/2024 at 11:15 PM, Mech said:

Good work finding the pushed back pin..

Time after time it's the wires not the electronic bits.. or Switches.. That flickering could be a key switch, or perhaps the kill switch, with dirty contacts. I'm pretty sure the flickering will be because the voltage to the gauge is dropping below the about 5volts the internals of the gauge usually work on.

Thanks .... So he got a new battery for it , and I had it running great except when I pressed the throttle it would big out and die. I ended up cleaning the carb and then it ran perfectly after that , I revved it up half a dozen times and then shut it off with the key to finish putting it back together for a test run . When I went to start it back up ... NOTHING.... I immediately checked to see if there was any spark and no there wasn't... So I'm back to square one again ...

 

I tried combinations of coils plugs plug caps and wires ... Nothing worked. 

 

Im going to have to go from the stator up to coil again with the multimeter... Gahhhh 

 

Oh, there's a few wires with the insulation off them , I wiggled them and moved them around to see if there is any spark .. but none still. 

 

 I don't know how it just went from sparking fine to nothing just like that . 

On 4/21/2024 at 10:58 PM, Gwbarm said:

Which one had no resistance, primary should have very little maybe.3 and secondary should be between 6 and 10. 

Thanks , and I'm not quite sure now thinking back on it . Also thought I'd have the darn thing going by now! But back to square one again. No spark again 

Link to comment
Share on other sites

50 minutes ago, Mech said:

You used the key !  The key switch has dirty contacts or lost movement in it's mechanism.

Just went out and tried , cleaned the contacts , and even tried connecting the two wires together, cranked over but still no spark , darn it 

Link to comment
Share on other sites

Well the standard procedure is check there is resistance through the cdi charge windings and the cdi trigger windings down on the stator plug, then crank it over and check there is some voltage produced at the charge pins and a momentary voltage at the trigger pins on the plug. You need a good spec digital gauge to detect the momentary trigger voltage, but an analogue gauge the needle flickers and is easy to see. , If there is voltage in both windings then we check they are getting to the cdi unit.

If there are those two voltages, and perhaps a 12v feed if needed, plus earth and a disconnected kill or a connected kill in some cases, then, if everything is ok, the spark should be very reliable. I would be suspecting the switches or the wiring. There are things that can go wrong in the engine though, like flakes of metal, or metal dust build up, that can short out the magnetic field between the magnets in the flywheel and the winding cores. If it's a flake of steel it can move and intermittently kill the trigger coil's output. I'd check for voltages out of those two windings, then look carefully at the wiring again.. short perhaps to frame ?

Oh, and is the dash still flashing ?

Link to comment
Share on other sites

28 minutes ago, Mech said:

Well the standard procedure is check there is resistance through the cdi charge windings and the cdi trigger windings down on the stator plug, then crank it over and check there is some voltage produced at the charge pins and a momentary voltage at the trigger pins on the plug. You need a good spec digital gauge to detect the momentary trigger voltage, but an analogue gauge the needle flickers and is easy to see. , If there is voltage in both windings then we check they are getting to the cdi unit.

If there are those two voltages, and perhaps a 12v feed if needed, plus earth and a disconnected kill or a connected kill in some cases, then, if everything is ok, the spark should be very reliable. I would be suspecting the switches or the wiring. There are things that can go wrong in the engine though, like flakes of metal, or metal dust build up, that can short out the magnetic field between the magnets in the flywheel and the winding cores. If it's a flake of steel it can move and intermittently kill the trigger coil's output. I'd check for voltages out of those two windings, then look carefully at the wiring again.. short perhaps to frame ?

Oh, and is the dash still flashing ?

Dash still flashing from 9to 0, but now it stops at 0 ! Thanks for this info. Tommorow I'll try to have another look at it and figure it out , again! Possible there is a shorted wire somewhere. Notable that once I got it running good and turned it off , I then proceeded to put everything back in its place and plastics and seat on etc... I put the CDI box back where it belongs. Maybe there is a shorted wire somewhere in around there . I'll check though and get my multimeter out for the rest of it ... 

Link to comment
Share on other sites

That sounds like a good plan, hopefully it is a shorted wire. They are sometimes hard to find, you may try feeding voltage directly in to the unit and see if it works then, that might give you an idea of where to start looking.

Link to comment
Share on other sites

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.

  • Similar Forum Topics

    • By justent_88
      Hello, im looking for some input on this situation i have. My 94 Mojave has no spark, and i have no idea what it is. Ive replaced/tested the magneto, the pickup coil, cdi, the ignition coil. Even the key and Killswitch. I haven't tested the harness its self, but i have tried another harness and still nothing. The only thing i can think of is the fly wheel itself. I have found a lot of metal shavings in the fly wheel and have cleaned it the best I could. But nothing happened afterwards. I am truly stumped here and hoping some of yous could shed some knowledge/ideas that could help get this thing to fire. 
    • By Spritee1
      having an issue with the unit when running under a load up a hill or in high gear, seems like the belt is slipping, there is a clapping sound coming from the primary clutch like it releases and snaps back in. i don't think I should have a noise like that. this is a friends unit and he has already replaced the primary twice with the same result.
      not sure where to look next
    • By Mhatayas
      What should I do about this , bad oil leak where the filter cover bolts on . Can I use some gasket maker 

    • 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.
       
    • 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! 

×
×
  • Create New...