slow n smokey..help!

Harry Barfield /
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my 72 maxi is fine when i first start it up but as the engine warms up (quite quickly!) its performance decreases. the top speed is still the same (around the 30 mark) but accelaration is very slow. it is also smoky. note the performance change has not been over night! ive rode it most days since february and it has always done it! it sometimes makes poping noises but i have put that down to the loose baffle (the retaining nut fell out and i havent bothered to replace it) as when it is in correctly it does not seem to 'pop'. im mixing the petrol at 25:1 with silkolene 2 stroke oil

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