125-200cc 8 miles per plug, this is getting old...

4 more miles down...

Still running.

It am gun shy to call it fixed, one more run should tell me.

I am planning a 120 mile ride this weekend and this is the bike I want to be riding.

Later,

Sounding good and another run past that original 8 mile point might wise ...

120 miles sounds like a long ways on a 125 ... Where you riding at?

It made it to 16 miles before the light faded and I got hungry, it was still running fine. First time in a while I didn't push it back to the barn. My dad will put a few more miles on it tomorrow for me.

Gifford, I did 114 miles there on the 125 last year. It is a great bike for that, at the end of the day the soft power delivery and light weight are awesome.

Pictures and videos in a few.

Later,

Ok some photos, while the video uploads.

First compression test, 98 hours on this piston/ring... The bike wasn't quite warm here, it ran for about 2 minutes then fouled a plug, I pushed it back and did the compression test.

Glamour shots between heat cycles...

Plug check after 16 miles with the stator swapped, top plug is current plug. Bottom one is one of the many fouled versions...


The only other change is the lighting coil is unplugged, both stators were wound by Walt but Ben had different connectors on his so I left it unplugged. The only other oddity was some scuffing on the inside of the flywheel probably from the epoxy from the rewind. I wouldn't think that would cause any issues.



Videos in the morning probably, they will take a while to upload.

Later,

Sounds good Jake, hope it's all sorted now. After reading it worked great for your dad then crapped on you in .3 I was beginning to think the problem was just you . jk

First video is up... This was before the stator change, the last plug that fouled, 11.5 miles.

Later,

You can sure hear it crackling/breaking up.

Could there be stay voltage leaking some where? Is the plug lead still in good condition? Try dielectric grease on the top of the plug next time. I know a hipo skyline that was blowing plugs after 1 pass. Was current 'leaking' up the side of the plugs, he put dielectric grease on the plugs, and no more problems. Just a thought mate. Good luck.

The madness continues...

So I put Ben's bike back together with my stator, CDI, and coil. I rode it 12 miles, it was still running fine when I parked it.

I went to hop on mine, it was running fine at 16 miles Tuesday when I parked it. My 12 year old nephew decided to start it earlier in the day, to see if he could, and it started fine for him. It didn't start at all.

I pushed it back into the barn and left, all I can do is laugh at this point.

I guess I will throw the phone book at it, check the reeds, clean the carb, change the crank seals, and change the ring. Maybe pull the kill switch, and push it off a cliff...

Here is how it was running at the last 4 miles of the 16 on this plug.

Later,

Years back I had a KTM that did the same thing, reeds looked good but I replaced them any way. It fixed the fouling. Reeds are cheap and easy to replace it's worth a shot. Good luck.

I guess you need to check your crank bearings too. If they aren't perfect they will cause the seals to leak and would also explain the inconsistant rub on the inside of the flywheel. Damn Jake but this is a puzzler.

Maybe it's your bike's way of saying it's ready to grow up to a 165

Seriously though, that sucks. I hate issues that have you chasing your tail.

un-related but cool vids fella! i'd love to have a back yard like yours!

Boy a head scratcher for sure. I have followed this with interest, but I don't remember if at the time of foul out if you checked to see what the spark looked like or if there was one at all? Seems like since the possibilities range from the stator to the carb that maybe not?

There is no spark from the plug that is in the bike when it fouls. New plug has great spark. I am interested in cleaning the fouled plugs to see if they are just oil fouled or if they are burned out somehow. That is a project for Sunday I guess, I have to get my WR250f ready for a nice long ride tomorrow.

Later,

Well, it is not the reeds, carb, or wiring harness... Jetting is RM needle in the middle clip, 40 pilot and 560 main. While I was checking the reeds I checked the jetting and put in a different TMXX I had laying around.

Today I rode it 5 miles and parked it, clipped some black berries for a while and came back to the bike. It ran for .3 miles and fouled the plug again.

Current photo of the reeds, they looked great still.





Later,

560 main??

Make that a 460... I fat fingered that one.

Later,

Did you get a chance to try the bad plug after cleaning or in a different bike?

As this is now a complete guessing game !! Im going for the wrong type of plug cap, what one is it fitted with ?