No spark 02 mm 700

M

midunn87

New member
Joined
Jan 25, 2014
Messages
14
Location
Richland Center Wisconsin
I can't seem to get my dad's 02 mm 700 to start it's completely stock. He said it started several times this summer and it would start right up, then after he let it sit outside for a couple weeks it got rained on a few times and he has not been able to start it since. Just thought it ran out of gas the last time he started it so he didn't think much of it. I pulled on it several times and nothing, tried ether and still nothing, pulled the plugs and no spark. Any body have this problem before? Any suggestions for things I should try.
 

Check connection at rectifier/regulator, and cdi boxes. Moisture, happened to me.
Dynmaic Ignition Sys Check


1.)do a dynamic check, hook up multi meter to pick up coil wires and pull the engine over, does it have varying voltage coming out of it?

2.)if "yes"it does, then check again at the same wires going into the cdi box, same thing?

3.) if "yes" - go to the output wire on the cdi, it goes down to the coils, does it show varying voltage at a higher voltage spec then on the other side coming from engine when you pull it over?

4.) if "no" the cdi box is faulty.

5.)if -"yes" then you have a primary coil problem if no spark
 
Rusty flywheel? You can see flywheel threw a square hole in the top of case. If its rusty it may not be triggering pick up coil when magnets pass it.
 
Well looking at the fly wheel is pretty rusty I tried to get a few pictures of it.
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You can unplug the master relay and the sled should start and run bypassing the CDI diagnostics circuit. To check the flywheel you need pull it the coil is under it.
 
Alright a few things I have tried with no success, first took Emery cloth and cleaned the rust off of the mag, still nothing hooked up the voltage meter to the pickup coils manual says I should have 189~231 I get 0, for the stator coil resistance I get 0.6 and the range is 0.36~0.44. I have checked the kill switch and key with the meter they work correctly, also tried the TORS system it works correctly, the manual says check the condensers and those are checked with a LCR meter not sure what that is. So at this point I am thinking the pickups are the problem. Anybody got any thoughts?
 
Just checking... When you say you cleaned the mag (flywheel), did you take it off and clean the inside? Not just the outside, right? I had a rusty flywheel and no spark a while ago, and I cleaned the inside of it and everything was right with the world again. I also used naval jelly to clean it (not the stator, but the flywheel).
 
No I did not take it off left my puller in wi dad never mentioned he couldn't get his sled started so I left most my tools at home. I think I am at the point of just taking it in and letting Yamaha look at it :/
 
sleddineinar said:
Just checking... When you say you cleaned the mag (flywheel), did you take it off and clean the inside? Not just the outside, right? I had a rusty flywheel and no spark a while ago, and I cleaned the inside of it and everything was right with the world again. I also used naval jelly to clean it (not the stator, but the flywheel).
Click to expand...
Probably a slightly brighter light too right.
 
midunn87 said:
...hooked up the voltage meter to the pickup coils manual says I should have 189~231 I get 0, .... So at this point I am thinking the pickups are the problem. Anybody got any thoughts?
Click to expand...

I'd start right there, double check your numbers if you have any doubt, but a 0 reading on a 189-231 spec sounds bad to me. At least the stator gave a reading, even if a bit out of range. It's not uncommon to have readings out of range on these tests, with the parts still being good. A zero reading though... I'd replace it. Unfortunately the pickup is attached to the stator, so for the common oem new or used replacements you have to buy the whole thing even if one is still good.
 
A couple of bucks said:
Probably a slightly brighter light too right.
Click to expand...

Not to steal another's post, but to answer your question. YEP! A lot brighter actually. I was asked by several people what watt bulb I was using, because it had to be something other than the stock one, since it was so bright.

As far a puller goes, most parts stores around where I live rent tools for free, you pay the price of the tool & then get your money back when you return it. Maybe they do same there in WI.
 
looks like you simply need a new stator from your readings. I will agree to disagree with the other poster about the outside of the flywheel not doing anything. Thats where the magnets are for the pick up coil, and when those rust it wont have spark, the inside of the flywheel is lined with stainless steel so it doesnt rust, it can become covered in a soot like coating but that will merely diminish the output of the lighting coils not the spark that comes from the pick up coil.

As mentioned earlier the pick up coil is bad and the only way to get one from yamaha is buy a new stator. One word of advice... buy a oem yamaha stator, dont go for the aftermarket stators, yes.. they are better priced but they dont last or even work at all so your time must be of some value to you so get a oem yamaha.

to change it is pretty easy, just remove exhaust can,remove recoil and then the 3 bolts that hold the recoil cup on( heat these up real good and quickly with a mapp gas torch to release the locktite on them so you dont strip out the heads, once those are off you remove the large nut and lockwasher. Use a steering wheel puller with 3 bolts just threaded into the flywheel the thickness of the flywheel and then it will pop it off( I use a impact gun and they pop right off). Youll then see 3 phillips head screws and 2 small allen head screws holding the pick up coil on, remove those and unplug the staotr. replace.... and it will run again!
 
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