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The 700XL is a good gun worth repairing and fairly easy to work on. You should be looking for two Senco rebuild kits, part number YK0243 for the top end and YK0244 for the bottom end. After installing all the parts from these kits you'll have a brand new gun. To take it apart, remove the four screws holding the head cap on. Keep track of how everything comes out so you get back together the same way, the kits have good instructions to get all the right o-rings in the right places. The o-rings on the long skinny trigger valve are hard to get off and on but they will stretch enough to do so. Use the assembly lube liberally on all o-rings. The center piece in the cap can be pried out gently with a screwdriver and is hard to get back in but make sure it is fully seated and straight in the cap when you put it back together.
Since the engine is running it needs to have an exhaust port, If it is in fine working order I would assume that it is simply the exhaust from the chainsaw. even with the trigger not pulled you are still idling causing exhaust build up. I would need more information to be able to delve deeper.
Assuming that there are no leaks, remove head and pull headvalve. Look for fine scratches where oring contacts head. If there is a deep groove worn into head or scratched, sand with 400 grit paper to restore smooth surface. If badly worn replace head. Reinstall parts using silicone paste (looks like vaseline, sold at lowes in the plumbing department, used for faucet orings) )
if you took the trigger apart the part that you unscrew has a nylon ball and a black rubber ring you should check them and make sure that you didn't loose them when you took it apart,if they are there, then you need to service the gun, and after you clean all the moving part and you put it back together, it may still leak from the top,Take a rubber hammer and give it a good hit,now not to hard, and it should seal
very simple to fix it
1 pull the trigger all the way out
2 there is a little piece of metal, pull it all the way out (detach the piece out from the gun) an connect one side of the spring
3 push the piece back on the gun.
4 on the other side of the spring tide a little fishing line
5 pass the fishing line over a small rounded piece and pull it hard
6 finally connect the side of the spring onto a little hock on the base of the trigger