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dstoner25
07-13-2012, 03:05 PM
Hey guys,

Im new to this website, but i figured it would be a great place to get advice.
I just bought a 1986 honda atc 250 es big red. Only paid a hundred bucks so what could go wrong. I hooked up the battery, turned the key on and it turned over with the electric start. The bike wouldnt start and the neutral light isnt on. I swapped out the cdi with a different cdi box and the neutral light came on but still no spark. I was reading some of the forums and it was saying it may be:
1) Coil
2) Pulse generator
3) Stator
4) Cdi
5) Neutral Safety Switch
I have a manual coming from honda to get the ohm readings for the coil, stator, and pulse generator. Well what do u guys think any advice????

kb0nly
07-13-2012, 03:28 PM
I would start checking voltages. See what you have for voltage from the stator, it will be an AC voltage, then check the input and output of the pulse generator, should see voltage on the input and pulses on the output, an old school test light works best for seeing the pulses on the output.

Check for input and output of the CDI, output can be checked at the wire on the coil. You said no spark so i assume you pulled the plug and checked it while turning it over. Check your plug wire ends, cut a bit off and reattach to the coil and plug cap to get clean connections if they look corroded. Try a new spark plug?

dstoner25
07-13-2012, 04:23 PM
Ok thanks i should be getting my manual today or tomorrow but i will try that thanks for the reply. Ill keep in touch if i have any other questions.

Flyingw
07-13-2012, 06:12 PM
You can download the manual here for free..

http://www.oscarmayer.net/atc/manuals/

daveb42099
07-13-2012, 09:11 PM
It could be the trigger coil i had to replace the one on my 86 about 3 months ago

kb0nly
07-13-2012, 09:27 PM
The 250ES manual isn't there, i don't have it either, but some of the other 250's are wired the same and gives you the same troubleshooting info. Check my signature link below for the manuals.

daveb42099
07-13-2012, 09:43 PM
The stator ohm readings on that machine should be .2 to .8. The single red and black wire just bellow the cdi is wear you test at the trigger coil i cant rember the ohm readings but take a dial style multi meter and see if it produces a voltage it will be very slight and the wire is blue and black. And the cdi make sure its the same one the plugs may be the same but they might be different.

dstoner25
07-14-2012, 03:09 AM
Thanks everyone for the great advice ill be looking into this early next week. Ill keep in touch...

bigred2
05-19-2013, 04:32 PM
Hey guys, along these lines... I'm working on my 1986 Big Red 250 and the start switch was bad. Having a junk 1988 fourtrax I I took the start, light/ hi-lo/ switch off and put it on Big Red. Had an extra wire but figured I could make it work. Well... everything worked except didn't have a spark (important part I know). I assume that it's the extra wire that's suppose to go to the engine stop switch, but I don't know what to do. The things I've tried have blown the 15 amp fuse. I'm not opposed to straight-wiring the engine stop switch but I'm not sure how to do that because I believe the switch is closed to stop... any help?

dylanisaacs
05-19-2013, 05:04 PM
here is the 85-87 big red 250es manual

http://www.hondaatvforums.net/forums/honda-atv-schematics-manual-help/23640-86-big-red-250es-manual.html

Trittd
02-01-2016, 10:56 PM
I have a 1986 250es big red that lost spark while riding. I already checked connections and switches and still no spark. My friend. Who works on big reds believes it would be the coil. Can someone please tell me how to check/test the coil, stator, cdi.

ps2fixer
02-02-2016, 02:41 AM
Pulse Generator - https://gyazo.com/ed058a42e6cda6e35e32d85002dbc823

Ignition Coil-
#1 - https://gyazo.com/49866bcb320be1a1825df333d453be95
#2 - https://gyazo.com/b3e0cb78eb0249b91a6955957fa6ab5a

Stator - https://gyazo.com/af7e9753b296f69d2c2771bf25fe1be1

All of the tests above require a multi-meter set to read resistance (2000 setting generally works fine). The service manual images explain where to take the readings, positive/negative does not matter when looking at resistance.

Posted this for OP's reference and Trittd.