touch107fm Posted April 3, 2013 Share Posted April 3, 2013 Hi Guys Yesterday I decided to give my polini thor a major service. Before I go into my problem with my Polini thor 100 has anyone replaced the rings on theirs yet, If so do what item code did you use. On the polini parts list there is one for the piston and rings together 928 020 001 . Also did you get the parts through polini or source them locally. I took the carbie apart and cleaned it fully no problem there. I put it back together and tried to pull start it didn’t fire up as expected.. I left it a while and came back to it and it felt like the bloody thing had seized, To confirm it was not running after the carbie clean out when I went to start it after about 1 hour if felt like it was seized. I tried to pull start it but would not turn over – Removed the spark plug no joy! Removed the pull start no joy! Removed the cylinder head to inspect and could see nothing wrong. I then removed the cylinder shaft so the piston was free everything looks fine. Now I start to move the piston up and down by hand via the pull start cooling fines. I can get it to turn freely but at the same position in one cycle it becomes very stiff, it is possible to do the full cycle but as I said gets very stiff at the same point. My understanding is in one cycle the piston goes both up and down? I for the life cant think what the hell happened from the carbie clean but I need to get to the bottom of it. Could it be the bearings? Crank shaft? Any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
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