Sorry to here that your quad is full of problems, but they are china made. I have a kazuma 500 and that has been a nightmare with problem after problem.
Gearbox went bang twice, the bolts that hold the final drive plate shook loose and smashed the gears. Carb overflowing constantly, flywheel turned on the woodruff key twice and im sure there are more probs to come. Lucky for me I work as a mechanic, so I can sort it out at my leisure. But if you buy Chinese products they will be inferior to the more quality jap products.
Like it has been mentioned, go to trading standards as it seems unfit f