Xmax 250 problem *need solution pls*

[abdhed]

Hi folks
I need your advice if you have any idea about this problem

my 250 xmax has reached almost 3000km. Now it doesnt exceed 80km in normal road when we are 2 persons. I feel the motor too tired after riding for half an hour and its performance is so bad comparing with the past. First time I took it to the service they told me there is no problem. however he just tried it between neighbourwoods/

Do you have any idea what can be the problem ?

[redeem ouzzer]

[Paulf]

Couple be simple like drive belt worn, or lack of compression. Try a new spark plug for a start, and check drive belt, rollers. If no problems try compression test.
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Past bikes simsom mofa 1s, suzuki hustler 250 (£35 in 1973), suzuki ts125k, mz150, yamaha yb 100, honda pc50, honda vision 50, all 2 stroke - then cars - honda pcx 125 (sold) own honda fes 125 and Mrs 125 spares or repairs. Started 1972 all accidents walked away no insurAnce claims