Hi,
I've seen the Polaris tech tip about burning a hole in the #1 piston on Fuji motors and adding a second fuel pump. My question is whether there are any other known issues that may cause seizure or damage to the #1 piston on a 1996 SL 780 (oil injection system , ignition etc etc). After 18 months of trouble free riding my SL 780 has blown the #1 piston twice in less than 10 hours of riding and in each case the piston has been broken apart. On the first occassion the top of the piston had big chunks of metal missing and screwed rings. On the second occassion the skirt on one side was completely gone and the skirt on the other side was cracked with rings that were once again stuffed. I have read that the diaphram in the fuel pump can weaken with time and have problems delivering fuel to the #1 carb at WOT so I will at least replace the OEM fuel pump and probably add the second one as recommended in the tech tip. I don't want to bolt it back together and have it go again so any ideas as to other places to look would be much appreciated. Another quick question .. what do the numbers on top of the head mean ?? I have 2 heads that are stamped with a 1 and one head that has a 2 on it ??.
I've seen the Polaris tech tip about burning a hole in the #1 piston on Fuji motors and adding a second fuel pump. My question is whether there are any other known issues that may cause seizure or damage to the #1 piston on a 1996 SL 780 (oil injection system , ignition etc etc). After 18 months of trouble free riding my SL 780 has blown the #1 piston twice in less than 10 hours of riding and in each case the piston has been broken apart. On the first occassion the top of the piston had big chunks of metal missing and screwed rings. On the second occassion the skirt on one side was completely gone and the skirt on the other side was cracked with rings that were once again stuffed. I have read that the diaphram in the fuel pump can weaken with time and have problems delivering fuel to the #1 carb at WOT so I will at least replace the OEM fuel pump and probably add the second one as recommended in the tech tip. I don't want to bolt it back together and have it go again so any ideas as to other places to look would be much appreciated. Another quick question .. what do the numbers on top of the head mean ?? I have 2 heads that are stamped with a 1 and one head that has a 2 on it ??.
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