I have a 2009 Suzuki King Quad, and it was having engine problems. It was bogging down and even dying whenever put under load. I tried to fix it by replacing the air filter and spark plug, since the dealership said I should have changed the air filter 700km ago. Now after doing that, it won't even start. It cranks, but won't fire. I got it running once since the plug and air filter were installed, but never since then. Does anyone know what I could do?