Finally! Got a MB!

congrats on the new bike. There's nothing like the feeling of that new bike (or the second or third one). Enjoy yourself and have fun!

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70cc HT
Moon Dog
crabdance@gmail.com

Sounds are deceptive. When I lost spark from dead coil AND magento (long pedal home) it sounded like engine was running. Simply turning over and opening/closing intake/exhaust ports gives a sound very much like it's actually running.

I'd recommend the nerdy neighbor kid who adores you, and who thinks motorbikes are the only way possible to escape his world...show him how to pop the clutch while pedalling, and make sure he understands how important it is to hang on to that spark plug wire end to validate test for spark!!!! Make up something half-believable, like a spark is dependent on weight and momentum, so you need someone light to check for "light spark".

hmm.

So if it wasn't really running and just sounded like it, would it have made a sound difference with twisting the throttle? It did make a little difference in the sound/speed of the sound, but not much.

I'm gonna see if I can build a little rig out of 2x4's tonight to prop the back wheel up so I can get on it and pedal and see what's going on, instead of having to fiddle with stuff while I'm pedaling down the road.

Thinking something like a U with basically a 2x8 on the base (for heft/stability) and 2 2x4's coming up and the ends of the axle will sit on top of the 2x4's...maybe a little notch there so it doesn't slide out. Think that would work?

yes, actually...with the throttle open the intake ports aren't blocked, so even more noise comes out. (you'd be shocked how much intake noise two-strokes produce! Try once sticking your head down low so each ear is equal distance between intake and exhaust and rev it up, you'll see).
Anyway, easiest thing to check is spark present/not present.

interesting. I'll see what I can come up with this evening. My wife's grandmother is in town, so I don't have as much bike-time as I would normally...

So, fuel is flowing fine. Not getting any spark though. Pulled the cover off the magneto and got about 1/4 cup of water on the ground. Cleaned it up and dried the mag out in the oven for a bit, still no spark.

I'm getting voltage on the white wire while I spin the tire, hard to tell how much since I don't have a bike stand though.

Have a feeling it's the CDI.

This sucks, I get to ride the thing for a total of 20 min, and it's down. Can't purchase new cdi till payday, then I have to wait for shipping anyway. And to top it off I have to listen to "I told you so" from my wife because of it.

I just want to ride my dang bike

Hey jasonh,
I went to box up the brake parts for you, and noticed there is only one lever. I'd recommend it for the front brake as 80% of stopping power is in the front. You can use your old levers from the canti's on the rear. Only difference is a slightly less effective rear brake. No big deal cause it'll still be really easy to lock up a rear brake! I'm sure shipping is only a few bucks, if you PM me your address, I can ship them out and you can re-pay shipping whenever...i'm super easy going. And if money keeps getting harder to come by, I understand that too.

Hey thanks man. You have a PM

Why not check to see if you have power on the blue /black wire combo at the engine.

then check to see if you have spark at the plug.

If you have it going into the cdi and not out then that sounds like your problem. I would check the blue black not just the white. It could be a wire problem there I would do that before I invested in a new cdi.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

I've gone through in another thread and tested everything. Looks like the magneto is my actual problem (didn't think so originally because of stupid test mistake). I'll probably just order a magneto and cdi at the same time. $16 for a magneto + 9 shipping, or $16 + 15 for both with free shipping...might as well just take care of it. Hopefully I can be back on the road by next weekend.