1999 Yamaha Timberwolf No Start

[jroger]

I bought a 1999 Yamaha timberwolf thinking it had a carb problem as the previous owner said he had been riding it and now it would not start. After getting it home I check the plug and had no spark. I got a copy of the wiring diagram but unable to trace it. I am an electrician and electronic tech, but this is a different schematic to me. Can someone walk me thru process... the run stop switch does this etc. power or ground, open or close to run or stop?

any ideas of trouble shooting the electrical would be helpful too.

Thanks

[Ajmboy]

Here are some pretty good articles that explains the ignition system of an atv and troubleshooting:

ATV Electronics series Part 1 - ignition systems: Off-Road.com

ATV Tech Tip: Diagnosing no spark or weak spark | ATV Mag Blog

* Added year and issue to thread title.

[jroger]

thanks a whole lot I printed it out and will study it. I 'll let you know by post how this comes out. thanks again

[jroger]

I went to the web site copied the article and tried to send a request for Article 2 and 3 but I keep getting the error CAPTCHA code is wrong.

Any ideas on this?

Thanks

[Raptor8]

I sent you a PM about this- hope it helps. Please let me know if it does.

[jroger]

There are four wires that go from I assum the stator to the CDI. The brown and red while spinning the engine reads 60 volts ac. on the w/r and w/g I get .1 volts ac. The brown and red read 300 ohms and the w/r and w/g read 0. I assum the brown and red are for charging the CDI and the other 2 are the pulsar coil to tell the CDI to pulse the coil to make a spark across the spark plug. With a 0 ohm reading an almost no volts on this coil I think it may be the problem. What do you think?

[DirtDemon]

I think the pulsar coil is supposed to read around 200 ohms, so I think you may have it nailed.

[jroger]

Ok, thanks for the reply. I will let you know.

[DirtDemon]

Any time man, Good luck.

[jroger]

I bought a 1999 Yamaha timberwolf thinking it had a carb problem as the previous owner said he had been riding it and now it would not start. After getting it home I check the plug and had no spark. I got a copy of the wiring diagram but unable to trace it. I am an electrician and electronic tech, but this is a different schematic to me. Can someone walk me thru process... the run stop switch does this etc. power or ground, open or close to run or stop?

any ideas of trouble shooting the electrical would be helpful too.

Thanks

Well it took some studing and research but I finally figured it out. The pulsar coil is open. Different wiring symbols and I think maybe mislabeling, but with patientence, that I was forced to have I traced it out.

Thanks for your help with the articles and links. When I get the coil in and installed I will let you know how it came out.

thanks

[jroger]

I priced a pulsar coil from 29 to 125 dollars. I went with the 29 dollar one. Got it in today. It is the same size. Just checking with my pocket knife, the magnet in the old one (original) seems to be just a tad bit stronger, but not really sure. I forgot to check the ohms doggone it. But anyway I put it together held the spark plug to the block and saw a gooooood SPARK!

Put the plug in, choke, and VARRRRRRROOOOOOMMMM, VARRRRROOOOMMM!!!!!!

Sweet sound.

Thanks for all the info and help.

Roger

[DirtDemon]

No problem, glad to hear you got it fixed.