I hear you and have checked all of those and believe that I have the engine tuned to the best that it can be based on other YouTube videos of the same stock buggy. Isent an email out to Daves Motors and explained my situation and he told me the best thing I can do is put a Tuned Pipe on it and it will wake that engine up like no tomorrow. He said that stock it has about 1.47 HP and with a Tuned Pipe I can get close to 3 HP, thats nearly doubled. I searched again on YouTube and found guy's with the same buggy with a Tuned Pipe on it and wow! man they rip like crazy, now! that's what I was looking for.
So... this is what I was told to do;
1) Get a Tuned Pipe
2) Install Red Clutch springs to get the revs up before engaging.
3) Get a better air filter system to let more air in.
With those basic 3 things I am told that this buggy will turn into a beast that can actually wheelie on take off and at speeds.
Thanks for the info guys I am off to spend some money. PS: Oh ha! have to buy a bigger steering servo, the stock on is already starting to skip.
nothin wrong with the redcat 1/5's.
I had bought a KM baja (hpi clone) and thought it was a great deal....till I raced a guy with a redcat rampage. That rampage smoked my baja in every way!
Now, on to your issue.
These engines are pretty simple overall. You have to look at the problem like if it was a weed wacker or chain saw.
You low-end power is very poor. This sounds like a engine running rich.
You have to have the choke off (once you have the motor started and idling)
You will want to adjust the low speed needle. there are 3 adjustments...the idle, low speed and high speed.
If the buggy is fine once its moving...then the high speed needle should be set right.
If adjusting the low speed needle makes no improvement....then there may be an air leak...
Check the gasket at the car(and the bolts) or check the muffler is on good.
If you buddies were good friends, they would help you diagnose the issue instead of wraggin on you. It sounds like they know 2 stroke motors, so they should be able to find the issue.