coil testing

[Bansheekidd97]

i just got done rebuilding my bro's shee engine, it ran for like five minutes and lost spark. so i got out my fluke multimeter and my yamaha service book and began to trouble shoot it. in the book it gives two tests for the coil, primary and secondary. the primary you touch your leads to where the orange and black wires go and its suppose to be between 0.28-0.38 i get 0.3 the the secondary you touch the wire where the plug boot goes and where the black wire goes i think i tried both. you should get 4.7-7.1 i get nothing. so i thought the coil was bad, so i ordered a new one 2nd day air thru vitos. so for the hell of it i tried testing that one same results. i tried 3 different fluke meters all set to ohm setting. wtf im i doing wrong?? oh come to find out it was the switch in the thumb throttle causeing the problem.. thanks

[BenBB]

Secondary should be 4,700-7,100 Ohms...did you have the meter on the right range? I've actually never tried to test one, have a shop here that'll bench test it for nothin', from what I've read testing with a meter isn't always accurate to tell for sure if it's shot...

[lonestar]

i just got done rebuilding my bro's shee engine, it ran for like five minutes and lost spark. so i got out my fluke multimeter and my yamaha service book and began to trouble shoot it. in the book it gives two tests for the coil, primary and secondary. the primary you touch your leads to where the orange and black wires go and its suppose to be between 0.28-0.38 i get 0.3 the the secondary you touch the wire where the plug boot goes and where the black wire goes i think i tried both. you should get 4.7-7.1 i get nothing. so i thought the coil was bad, so i ordered a new one 2nd day air thru vitos. so for the hell of it i tried testing that one same results. i tried 3 different fluke meters all set to ohm setting. wtf im i doing wrong?? oh come to find out it was the switch in the thumb throttle causeing the problem.. thanks

I never got a reading on a stock coil either. On the secondary. I think yamaha dealer will check it for you for nothing. They gotta differant way of doing it. They juice it up with volts then they check it. This is what i was told.

Edited July 29, 2006 by lonestar

[dalegoldston]

Once you found the problem with the switch did you run with the new coil or the old one? Cause I am getting the same reading on my coil but I know I do have a problem with my stator.

[Bansheekidd97]

Once you found the problem with the switch did you run with the new coil or the old one? Cause I am getting the same reading on my coil but I know I do have a problem with my stator.

we ran the new one.