Hi , I am new to this forum , I have recently bought myself a non running petter PH1 stationary engine which came off a small dumper truck , So far i've fitted a new exhaust and air filter , ive rebuilt the injector and bleeded the fuel system and im getting the clicking noise from the injector and getting a good spary from the nozzel , the engine is free and turning over no problem with the decompression lever in its on position which allows me to crank the engine upto speed , when i move the decompression lever to the off postion the engine compression becomes to high to keep turning the engine by hand and the engine trys to backfire and run backwards , when the engine backfires i get a small puff of smoke from the inlet manifold , can anyone give me some advice on what im doing wrong of what could be wrong with the engine . chris