need help

I purchased a cag about 3 weeks ago, my friend purchased one at the same time. We put them together and bought the same type of gas and oil. We mixed 25:1 for the first 5 tanks. About the fourth tank we started opening them up. Both bikes were fairly close in speed but mine was faster on top end. Both of these bikes are stock. We are both running 32:1 now.

Last week the temperture dropped. Ever since then my bike has stopped running right I dont know if the change in weather has affected it or not. He was killing me all the way around.

What I've done to try and correct this.
1. I pulled the air filter out and cleaned it.(it had soaked up some oil/gas) No change in performance.
1a. Changed needle position from 5(stock setting) to 3. Helped top end but killed bottom end.
2. Pulled the carb apart and checked there was no obstructions. No change
3. Changed spark plug installed NGK bm7a. no change in performance
4. Positioned needle back to stock setting 5.

I am getting closer to where I was orginally but still am not there. His bike even has a different sound to it. It's like my powerband is not opening up all of the way.

Both bikes are stock and he has not turned any wrenches on his bike. Please Help.

The cold weather has made you bike lean out the air/fuel mixture b/c cold air is denser than warm air. The fact that your bike came stock with the needle in the 5th clip tells me that your bike was lean from the factory, thus your top end slightly higher than friends at first. When the bikes are assembled at the factory, the stock tunning position for the needle is the 3rd clip. If the bike does not run correctly the factory will adjust the needle as needed. I bet your friends bike's needle is in the 3rd clip. Now that the weather is getting cold you will need to either go one size bigger on your jet or shim your needle with the clip in the 5th positon. You can pull the needle out and place washers beneath the C-clip and reassemble to "Fake" a 6th clip position. I would try this before reaming/drilling your jet. Remeber that these bikes are all made to sloppy Chineese tolerances and there is always going to me some difference from bike to bike.

Would the colder weather not effect his bike also into making it run poorley?

I would think that if the weather was the factor that his performance could be effected also.

But I am no expert on 2 stroke engines I'm still learning.

Would changing to a hotter plug help my situation any at all?

Well if his needle is in the 3rd clip then the cold weather will lean his bike out a little as well. But the fact that he is still in the 3rd clip and not the 5th like you will change the behavior of the bike when running. When you lean a bike out it will increase the speed and possibly the overall performance of the bike untill you reach a certan point of leaness, then the engine will be starved of too much fuel and it will bog or shut off. Prolonged running of an engine that is too lean will cause it to overheat internally causing catasrophic engine failure. Burnging a hole in the piston, melting rings, destroying the cylinder wall, all sorts of good stuff. The best way to tell if you are running lean is to install a new spark plug and run the bike with you on it(to load the engine), gradually bring it up to full speed, hold it at wide open throttle for approx 10-20 seconds, then shut it off and coast to a stop. Pull the plug out and look at the color of the porcelin surrounding the electrode. If it's white it's lean, if it's burt and black it's rich, if it's a nice tan color then it's pretty close to where it needs to be and your problems lye else where.

I am going to try and put a spacer in tomorrow, I'll post up and let you know what I find out. What would I need to purchase if the spacer isnt enough?(for a permanent fix) I've seen tapered needles is this what I would need?

Do yourself a favor and use this tip.
This could save you a lot of time and money.

You might try running the mixture between 40:1 and 50:1 as well. This will effectively give the engine more fuel.

I will try that also
Thanks