Motor has no power.

16:1 is way too much oil, generally ppl break in with a 20:1 ratio - I daresay even 32:1 would be OK with today's quality two stroke oil.

Just about ALL of these engines run very poorly until they're broken in, 100 - 200 miles for most, so ya need to do quite a bit of riding (not a horrible chore lol). Check your plug color frequently while you're in the break in stage at least and adjust the fuel/air mix accordingly - yer lookin for a nice chocolate brown electrode (let yer motor cool before pullin' the plug else you may strip the threads). Black & greasy = too rich and move the carb's needle clip up a notch, gray/white = too lean (harmful to motor) and you'll need to drop the clip a notch. Sounds like yer runnin' really rich - a good place to try the clip is the second slot down and work from there.

Sorry I didn't see this post till now - hope ya get that sorted

If you didnt take your time putting rtv or gsket sealer on the carb when you mounted it you will have an air leak,also let it sit at hand tight for an hour, then tighten the rest of the way, make sure you let the rtv dry a little before starting, i had this same problem and it drove me nuts, i used a tooth pic to get the silicone in the groves in side the mount clamp, if that makes any sense, just make sure there is a really good seal or you will get a leak, even with the leak my plug looked rich. and my motor took 300 miles to break in, at 250 or so it got a sudden increase in power and then seemed to use a lot less fuel as well. good luck,,, I mix 24:1 for break in

I had already moved the clip up one notch making it the 2nd down from the top. It ran better, but still bogs at speed, has no low-end, sputters, pops and wheezes. I have been putting miles on it and it is running marginally better, but I have not had time to drain and remix fuel, not have I had the opportunity to seal the carb mounting with RTV as recommended. Funny, the end cap on my muffler fell off on my way to work, and now I sound like a noisy dirtbike motorcycle (which is far from what I want), though sadly, it now has more power. I can't find the darn thing so I have to order another cheapo.

If ya can - get rid of the dang thing altogether and get a tuned pipe (I really like mine from Sick Bike Parts), if ya cant - replace the bolt in the new factory muffler ASAP, those are so soft mine wouldn't flatten a lockwasher without stripping. I solved that problem with 3 lil spot welds, two on the lip of the can & cap, one on the bolt head (spot welds so I could grind 'em off later if I wanted).

Then I replaced it two days later when my expansion chamber showed up in the mail lol

As for the "bogging" - bet ya just need more miles, you made it a lil leaner and it responded - the rest does sound like a new motor learnin' it's role in life

Funny that this is what my wife suggested also, just after the cap fell off and disappeared along a rural stretch of miles that I ride to work, but if I happen to find that darn cap during my next search and rescue attempt, tacking it back is my plan. The noise is embarrassing as I am a 5th grade teacher and am not craving both parent and student attention as I pull into school every day. The kids love it.

Weekend update. Okay, drained the tank, and refilled with 25:1. Then I disassembled the carb, nipped off 1/16th of an inch of the primer pin's tip, so it would not interfere with the vertical movement of the float, slightly bent each of the little brass tabs up to allow the float to go higher in the bowel. Aired up the tires to max capacity, oiled my chaines, rechecked my nuts (heheh) and stuffed some steel wool balls in my muffler, put a redbull can with hose clamps on the end of my cap-less, noisy arse muffler, and it started RIGHT AWAY. Okay! Much better. Instead of huffing 200 meters to get it started, it started on the 2nd or 3rd pump of the pedals, still needed a bit of choke for a few meters, ran better than ever (which means better than crap for the 1st time). Still, though it runs better, it still sputters and tries to die when I am going along at speed on flat ground.

Sweet! Glad you made progress man, now comes the "hard" part - rack those miles up!

It really will drive ya a lil nuts trying to "fix" the engine till it breaks in, now that you've gotten the major stuff out of the way - ride! My 'Black Stallion' took almost 300 freakin' miles before it snapped out of it and ran right.

I prolly treated it too nice lol

mine is a BS (Black Stalling) also. I have maybe 50 miles so far. I have not sealed the carb with RTV yet, but I did stick in a new squishy O-ring to help. I may still pull the plug to see how it is (lean or rich) still and get some RTV, but it can get me around with less frustration for a while like this.

Idk if this will help you, but I narrowed the jet in my carb by a very small amount and my engine got WAY more powerful. I filled the jet with solder, and while the solder was still "wet", I pushed the lead from a germanium diode through it and quickly pulled it back out. Didn't need any fancy drill bits, no fancy exhaust pipe or carb, just a $0.03 electronic component and some trial & error =D

not sure how this happened BUT it appears that I am both DevonAlcorn and GoesVroom on this board. Dual personas?

Anyhow, got my ego all pumped up thinking all was doing so well on my bike now. So, I left in my work attire to attend a meeting last night for my school district. My accelerator cable snapped off, okay, so I reached down and twisted my idle speed adj. screw a bit to keep limping me toward my appointment. GOt there in time. My first night ride home with lights, helmet and tail light, and now the chain hopped off and got snared inside the engine sprocket cover...couldn't pull it out...jammed, couldn't remove the cover, because I did not have a correct wrench to accompany my screwdriver in the dark. It was a long walk home last night to help put my babies to bed. Forget about my dinner...jeesh. So, eventually, I ordered several new cables, a muffler and an extra clutch cable to be safe. Grrr 4 cables and a black muffler for $40 free shipping from ChinaGas.net

Let me know if I am foolish to use them.