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| MR175 No Spark https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=993 |
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| Author: | yamaha1999 [ Thu Apr 13, 2006 2:56 pm ] |
| Post subject: | MR175 No Spark |
Can someone please direct me in the right direction? I have a 1976 MR175 that has no spark. Actually , it has spark if I hold the coil wire and turn it over by hand, I get a heck of a poke(Im assuming this is because Im grounding myself out)but no spark if hook the spark plug up to the coil wire. Is this a bad condenser on the coil? Any help would be greatly appreciated. Thanks |
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| Author: | mitchie [ Thu Apr 13, 2006 3:31 pm ] |
| Post subject: | |
Assuming you are grounding the sparkplug to the cylinder and still have no spark, it sounds like you may have a bad cap connector on the end of the coil wire. They are about $5 and you unscrew the old one off the end of the wire and screw the new one on. |
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| Author: | yamaha1999 [ Thu Apr 13, 2006 3:35 pm ] |
| Post subject: | |
Unfortunately, I did try this hoping that would fix it, but no success. Thanks |
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| Author: | scraphous [ Fri Apr 14, 2006 6:01 am ] |
| Post subject: | |
check you ground. when you hold the wire your supplying a ground curcuit thru you to the kicker. |
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| Author: | mdlafferty [ Fri Apr 14, 2006 3:20 pm ] |
| Post subject: | |
Be sure to use a new sparkplug. |
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| Author: | yamaha1999 [ Mon Apr 17, 2006 9:22 am ] |
| Post subject: | |
Well, I have tried everything posted. Nothing worked. The only thing I can do know is replace the ignition coil or the stator. The problem is I dont know which is bad. Anybody have any Ideas? Also, where could I purchase these electrical parts? Thanks for all help. |
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| Author: | ricortes [ Mon Apr 17, 2006 12:05 pm ] |
| Post subject: | |
Check the coil and stator resistance with a VOM or DVM. Pull the connection between them to check. Guessing they should have between 2 and 7 Ohms resistance. Zero or infinate would be a problem of course. If you leave the stator in, you should see zero Ohms with the points closed, 2-7 with them open. If you don't, points or maybe condensor are the problem. You can hook up 6V DC to the coil to check it. I keep a small lead/acid sealed battery from one of those $10 rechargible 1,000,000 candle power flashlights around for doing that. You just wire it across the plus and minus terminals and when you disconnect the plus side of battery a spark should jump from the high tension lead to the ground terminal. |
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| Author: | yamaha1999 [ Mon Apr 17, 2006 2:56 pm ] |
| Post subject: | |
Does the MR175 have a rectifier on it? |
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| Author: | ricortes [ Wed Apr 19, 2006 3:39 pm ] |
| Post subject: | |
What I believe is a rectifier on my MR250 is square, just a bit bigger then your thumb, has black white stripe, black yellow stripe, and green wires going to it. |
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