lew
Member
i am new to the site and i am looking for any info to help me. ok well i bought a 1995 mach 1 670 from a guy and when i got it home i tore down the top end and put new jug and head gaskets on it well when i was in there i noticed that the pistons were brand new oem bombardier pistons and the jugs had a fresh crosshatching on them. so i put the gaskets in it and lubed the cylinder walls and put everything back together and it ran great. i took it out a couple of times and it screamed. well the third time i took it out i noticed it was running like crap.
so i took the plugs out they were burning fine but not quite as "chocolate" as it should have been. so i tested the gas and it had some water in it . so i then added 1 can of fuel deicer enough for approx. four gallons and put five more fresh gallons in it.. made it about 25 miles and blew a piston. i took the piston out and took it to a machanic with the jug and he said it looked like detonation. the edges were all chipped off.
so i put it back together with a new piston and ring kit the jug looked fine luckily. well i got all the specs for the motor and carburators and went through everything changed crank seals reset rotary valve. checked for bent crank. it has stock jetting pto 430 and mag 410. put it together fired up ran great. made it 1.5 miles and blew the other piston. same prob. now im thinking jetting any idea's
so i took the plugs out they were burning fine but not quite as "chocolate" as it should have been. so i tested the gas and it had some water in it . so i then added 1 can of fuel deicer enough for approx. four gallons and put five more fresh gallons in it.. made it about 25 miles and blew a piston. i took the piston out and took it to a machanic with the jug and he said it looked like detonation. the edges were all chipped off.
so i put it back together with a new piston and ring kit the jug looked fine luckily. well i got all the specs for the motor and carburators and went through everything changed crank seals reset rotary valve. checked for bent crank. it has stock jetting pto 430 and mag 410. put it together fired up ran great. made it 1.5 miles and blew the other piston. same prob. now im thinking jetting any idea's