MOPED ARMY

Were you running at full throttle when it happened or at a constant throttle position? Could've had a lean spot somewhere in the midrange of your throttle and seized it.

and the cylinder

Possibly an exhaust leak or it wasn't jetted properly. How were your plug chops?

Yeah I don't run WOT for 1.2 miles even when broke in. You have to variate your revs a bit.

cause stock parts were built to last. kits were designed for racing. you can make them last for a long time if your not constantly pushing them to the edge.

Also, how long did you run the bike at WOT before doing a plug chop and did you do the chop immediately after cutting the engine?

Did you chamfer the edges of the ports to smooth them out? How does your ring look? Busted? Cause it looks like it got caught on the exhaust port.

I run that kit and use an 88 main jet with the same carb running the high flow air filter... What air filter were you running?

I installed the kit...ran the bike for about 400/500 miles gently...only smoothly opening up the throttle the whole way. After about 200 miles i pulled the plug and it had a nice brownish/black tint. It was definitely not lean. I then ran it for another 200/300 miles and pulled the head off and just wanted to make sure the cylinder was OK. Everything looked good...so I figured I was golden at this point. I ran the bike for probably an hour or so opening it up a few times for about a mile or 2. Parked it...came out the next day...ran it fairly 'normal' again...but then going through the liberty tunnel in pittsburgh....i got out the other side and BAM. i heard a weird metal noise. I stopped the bike and let it cool off for a good 30 minutes. Tried to start it up again...and nothing. It was really hard to pedal to start...so at that point i knew the piston was hanging up. I may have just ran it too hard too soon. I didn't grind anything down on the bike...no smoothing out of the exhaust ports or anything like that. I didnt know it was crucial. This is my first kitted bike by the way. I'm willing to try this same kit again...as it did run awesome when it was running correctly...but maybe i'll go with a modest 60cc kit instead? any suggestions are welcomed.

15mm BING 82 main jet. 15mm intake. Needle is 2nd groove from the top (mine has 4 grooves). I got the intake from treats hq as well as the exhaust. B6HS plug (stock). Nothing too fancy really. I suspect I just killed it due to running it at WOT too long. Cruising at 35 didn't stress the bike at all...

Also, Tim from TBS has an Airsal kit for sale. I think it's new or only has a few miles on it... You should hit him up. You can probably get it for less than a new one...

It was probably lean. The main jet doesn't really kick all the way in until you are blasting it so it would run okay at lower RPMS... Did you just check the plug color or did you do a plug chop at full throttle?

What pipe is it?

TBS is the cincinnati branch of the moped army and tim is a dude that's in it... :)

I'm about to roll but if you just pull your plug out without doing a chop at full throttle, you can't actually tell if the main jet is lean... Unless it's hella lean, which your probably isn't. With your new Airsal, start with a 92. Buy 88, 90 and 92. Once you break it in rock the 90 when it's cold and the 88 when it's hot and you'll be rocking. Also, move to a cooler B8HS during break and in the summer and a B7HS in the cooler months. That should make you happy dude. If you are running a Grand Prix pipe you might need a lower range like 86, 88, 90, i would assume.

Interesting... your first post says "after 100 miles" every post after that the miles seemed to grow,

You said the plug looked dark brown/black after 200 miles.. doesnt sound like you did a chop .

Sounds to me like you never checked the plug the right way and were too lean add that to a too hot of a plug and wide open for a long time = meltdown

http://www.strappe.com/plugs.html

http://www.dansmc.com/spark_plugs/spark_plugs_catalog.html