Hey, I just bought a high performance carburettor and installed it on my bike engine. I had no room for the air filter so I am using a stocking and hose clamp as a filter. When I tested it out I was moving much slower than I go with my stock NT carburettor which doesn't sound right. I have a windowed piston and I run 18:1 mix fuel (what the manual suggested but is this too rich?) When I go full throttle the revs sit at a spot where they sound different, kind of borey.. How can I get it to run better?