Author Topic: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!  (Read 891 times)

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Offline acpat

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1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« on: February 20, 2017, 09:40:59 AM »
anyone know where there is good complete color coded diagram online ? yes I did not mark them and need to know what goes where ?

Offline acpat

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #1 on: February 20, 2017, 10:50:55 AM »
okay think I got it figured out only one remaining is black with white stripe coming out of cdi ? onyone ?

Offline 4V5

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #2 on: February 20, 2017, 01:43:53 PM »
Yamaha's are cool as they keep the wiring colours uniform across most their bikes..

Black wire with a white stripe is the kill switch... earthing that wire will turn the motor off... if you need two wires for a kill switch the plain black wire is the earth wire. ;)

IT465x4 IT400C IT175F YZ465G YZ250C YZ250WR XJ650G RD350LC RD250LCx5 DT175Nx3 TW200x2 DT200L DT200R RT3 RX100G GT80F YZ80L PW50J KH250B1 KZ250D1 PE175C TS250ER TS185ER AG175B AG100

Offline acpat

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #3 on: February 20, 2017, 11:50:02 PM »
Okay where does short male pigtail black wire go off the coil ? Is this the other side of kill switch ?

Offline DynoTronix

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #4 on: February 21, 2017, 12:04:37 AM »
Short wire from the coil winding should go to the orange wire from the CDI. 

Bill

Offline acpat

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #5 on: February 21, 2017, 06:10:37 AM »
thank you bill you guys are awesome

Offline acpat

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #6 on: February 21, 2017, 08:37:00 AM »
Okay new 81 yz250 motor in 82 IT250 frame
full of fuel = check
wires all correct = check
everything tight = check
kicked it over twice and bing bing bing.......Then the fun began. motor reved to moon as carb was overflowing out the vent. pushed in kill switch which some how back fed from the coil. (beginning of a new hair do) so freaking out I yank off coil wire. This finished off my new blonde afro. I think i will take a nap and fool with it in the am once I quit studdering 


Offline Devondan

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #7 on: February 21, 2017, 08:53:49 AM »
I think I have a wiring diagram, let me know if you need it!
Dan
IT  400D - Trail riding
74 Montesa Cappra - Racing
YZ250 H - Racing
Norton ES2 500 trials
Norton 250 Jubilee - Road
Norton 350 Navigator (in boxes)
Norton 350 Single M50 (in boxes)

Offline acpat

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #8 on: February 21, 2017, 11:38:54 AM »
you have a pm sir

Offline acpat

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Re: 1981 yz 250 wiring diagram ???? HELP PLEASE !!!!!!!
« Reply #9 on: February 22, 2017, 02:52:23 PM »
devondan got the diagram thank you. by using a single wire kill switch instead of a two wire, I became the ground. Need to order the correct two wire kill switch.