Originally Posted by
pitpop
the engine should be easier to tune with the short needle, the long low/mid needle is for mileage
ok i got a sirio .21 and it will not start unless you pul throttle and as soon as you let go it stals and we have done the turbo and the right plug and nothing got new carb still nothing we have tried HSN, LSN and idle everything and 25% nitro 6 and 6 syn and caster please help im stuck