I had to change inner spark plugs. Why? Because by silly mistake, I put diesel instead of gasoline in the tank and tried to start GRiSO. (don't ask me how did I do this silly thing. It is a long story) So... I had to remove gas tank, clean the tank and injectors and had to change spark plugs. Removing of outer spark plugs took only 5 minutes but inners... Ohhh boy! I found out that I must have special tool to remove that Ferrari type PMR8Bs which I didn't have. Here is no Moto Guzzi service. I started to visit all of the bike services starting from BMW to Kawa but none of them have that pipe type 16mm wrench with only 1mm thickness to fit that... hole. Than I seached through internet for 05.90.19.30 and found in 3 sites. In US it was $112, In Germany €59 and in UK pound 28. They both were a lot of money for just to remove 2 f...ing spark plugs.
After 4 days I tought I better do this tool by myself. So,... Now I have it and works well. Cost me $5
If anyone need it I can send it for $5 plus postage (which costs around $8 by Turkish PTT registered small package)