sime 71

hi all.i have a my00 bugeye the problem that i have is when it's warm it just dont want to start straight away,i turn it over for about 8 seconds then stop and try again and it normally fires up after the second time round.i have no problems startin it up from cold tho. it also seems to have lost performance not much but i can feel it holding back just a little.If anyone can give me any idea of what it could be it would be appriceated thanks in advance