Got an 826 hydro that has been brought back to life after sitting 2 years. Did some work to it, got rid of the ether injection and what not as well as put the panels back on. When driving or when under load at certain rpm it will shoot a stream of blue smoke. Its more noticeable when the tractor is low idle working around the yard and disappears when you rev it up. Although I had it full throttle on the road and every once in a while itd shoot a bit out but seems to clean up more once the tractors been running. I dont know if this is old diesel left in the tank or dirty or worn injectors would just like to know if anyone else has had this. Thanks.