Well i have 2007 suzuki LT-z400. Jetted, Piped and K&N filter. This last summer i have had some starting issues. I can push the starter button forever and ever until the battery dies and get nothing. But if i pull start it and pop the clutch and keep the engine going til its warm you can push the starter button and it fires right up but if you stop riding for a while and it goes cold theres no go on trying to start it with the button. I have torn the engine apart cleaned out the carbs, filters, breather hoses you name it. Anyone have any idea what the problem could be? If so please email me at xMIKEx801x@hotmail.com thanks for your help.