he could kick it off and it would fire but only for a while ,30 seconds or so before it died .
thinking that it must be maybe a carb problem he had purchased a new carb and also a new fuel tap hoping to cure this fault but still to no avail ..it now wouldnt even start at all !
so, although i had my suspicions I made sure and checked the fuel flow and checked out the carb jets and changed them back to suit his motor as his new one was supplied for a gp200 ,trying to keep it logical .
hey presto, it did fire up again but still died a few seconds later ..despite a couple of attempts and my initial suspicions were immediatly confirmed when I noticed that nothing was coming out of the tail pipe .
so i tried to clean it out by sticking a rod up it but again that didnt work ,so i just removed it ..and it felt so so heavy .I tried blowing air through it but couldnt feel anything then filled it up with water from the u bend just to check and not even a dribble from the tail pipe lol
so ,s/h silencer now fitted and guess what ..its fine and running lovely

just shows what a blocked up silencer can do and how you can waste your £ on other things