[jetfreak]

Hi, where you can get the parts I can't tell,
Im from Holland, u c
but I would recommend you to go look for
a 44mm carb, an aluminium cilinderhead
and a factorypipe, maybe a new impellor as well
try looking at ebay!

 

[jetfreak]

If it's an 550sx you need NGK BR8ES spark plugs,
best way to free the pistons up is to order a new basegasket and headgasket und take off your cilinderhead and cilinder and see what's going on,
but you can first try to put some oil in the sparkplugholes and wait for a few days sometimes that will help!!