MOPED ARMY

Wrist pin clip.

Pull the top end and lets see pics.

Pull the plug and cover with your thumb, kick it over. If it doesn't blow your thumb off no matter how hard you push, your rings are toast. I vote wrist pin clip as well though. Although you did make it lean, the auto oil injection keeps things mostly safe on stock or very lightly modded setups.

Would say so.

I am trying to understand how this happened so I don't repeat it with a new piston. Was this likely caused by improper installation of the wrist pin clips by previous owner? Or because I ran it too lean and it got too hot?

This tragedy has got me considering a kit. It will be my first kit on any bike except one (already had it when i bought it). I have read loads of posts and wiki articles about it but there are still a few things I was wondering about.

I see lots of posts of people complaining about shitty clips in kits and saying not to use old ones. But I don't see any recommendations or links for "good clips".

I am considering the

Malossi cast iron 70cc https://www.treatland.tv/hobbit-malossi-cast-iron-70cc-kit-p/honda-malossi-45.5mm-313642.htm

or

DR Kit https://www.treatland.tv/honda-hobbit-pa50-moped-DR-46mm-70cc-cylinder-kit-p/honda-hobbit-dr-70cc-kit.htm

Any others I should consider for the NU50?

Can I use my stock head on these kits (above) or is that a bad idea.

I think I read that the jet on the stock carb is 85. I see people posting good results with DR kits and 90-95 jet in stock carb. I was planning on just getting a 90 and 92, should I get more jets in a larger range to find the right one?

That was not due to lean running in any way. That was mechanical failure. Either the clip was reused at some point (don't do that) or a new one installed improperly. OR, the bike was free revved to the moon while on the stand. Could be a combination of all three.

The DR is a killer kit. Loved mine, killed it losing a clip (revved on stand). Bought another, chunked a piston, honed it, new piston, ate a clip, honed it, new piston. The thing will not die.

Chris,

Thanks for noticing. I don't know what kit it is, i can check for any markings and measure it. Not sure how else to tell since I never bought any kits until yesterday (treats sale got me). I didn't realize it wasn't stock. I just got it on craigslist and the dude didnt know a damn thing about it. He tried to put the front end back on and didn't hook up the brakes at all. He also didn't know what the autochoke was and hooked the battery drain hose to the CARB! so the battery box was filled with oily residue (no battery tho).

The fact that its not stock certainly explains why it was so much faster and better than my stock Urban. I threw the BX31 belt on it and took off so I thought it was just that and didnt consider that it came kitted. But also explains the failure... someone sucked at putting in a piston and they should have plugged that decomp. Hope I can do better. (edited)

How fast was it running man since I'm undecided on the kit 60cc or 70cc. I dont want to change the carb.