Hi I just read through the owners manual of your 2 stroke manual, during the run in period ( break in ) you should not go more than 20 KP h or 14.43 miles an hour.
Also your bike should not be running rich it should just have a higher oil to gas ratio.
this motor should not be operated more than 1/2 hour at a time and it will need to cool off completely before using it again during this break in period that last 500 Kilometers which is around 310 miles give or take.
We can help you make your motor perform better and perhaps run faster but if you continue running the way it seems you are you will need more than add on performance parts you will need to replace the engine prematurely.
there are other helpful routine maintenance procedures in the manual that if you haven't read I suggest you do so right away.
these little motors are very inexpensive but labor intensive and costly in terms of your time to go through a correct break in period but without investing your time correctly the first time you are doomed to repeat it.
If I was you I would read the manual again and check and recheck every single serviceable part on the motor to check for damage. if none is found continue with the break in procedure. if the motor shows signs of excessive wear to the cylinder walls you may consider buying another kit and using the old motor for spare parts.
It would suck to suffer through a break in period on a motor that is already on its way out due to improper operation during this period.
I wont say your alone on this as I bet that many people here have done the same thing with their motors some get lucky others don't then blame the cheap kit. I cannot say for sure that you have damaged the motor however from your post that I have read it deserves an inspection.
the manual has very specific instructions for routine maintenance if followed properly from day one there is still no guarantee that everything will go as planned but you have a better chance if after the break in period is over and you followed the manual to the letter you will have a better performing motor.
one that is worth the effort and cost adding aftermarket performance parts.
At this point I don't see any reason to buy performance parts as a proper running motor may perform well beyond your expectations once you get through the break in period.
once your past the break in period and your bike is tuned properly and still need more power and more speed you have many options higher compression head with larger cooling fins, the intake it seems you have addressed already however the new manifold may require porting and polishing to make it flow better. a chambered exhaust system will help with scavenging effect most importantly your motor must be tuned and the maintenance done on a regular basis. if you neglect the air filter for example which the manual claims should be cleaned every 5 to 20 hours which is very frequently any performance upgrades wouldn't work as designed.
So I would have a stock of filters so I can clean one and have 2 or 3 more ready to be used. as they are easy to clean but also easy to neglect.
I think the exhaust you have picked out will work fine for your engine the expansion chamber is small but I think effective for a 2 stroke motor even with the porting work your planning on.
if your really wanting a reliable well tuned 2 stroke motor check this company out as they have many coating options to maximize the efficiency of your engine and chambered exhaust system.
http://www.dprracing.com/scec.html#2strokepiston
I am still in the planning stage of my build but what ever gas motor I decide to use will be disassembled and the parts that this company can coat I will have done. it may be expensive compared to the price of the entire kit but I think the effort anyone has to put in to these tiny motors getting through the break in period is worth it with less problems and a better performing engine in the end.
