Try to test the crankcase and front seal with a very slight pressure to crankcase. Remove exhaust and clean outlet and tape shut with ducktape. Remove carb and you will see a small hole next to where carb goes. Apply a slight pressure in that small hole with a tube. Next while blocking off where carb attached with a cork, or your thumb..... squirt bubble water on all joints and seals. If there is a leak it will show up. Hope you understand this. Do not have the pressure over 1-2 pounds or less. Capt,n