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also check

I believe that this model has two double carbs. . Carburated models have lot of petrol vapors inside the intake manifold that escape in the engine space. Check engine space for odors. If so, check the following hoses (marked as ** are the same for injection model)

1) Fuel lines as described above. **
2) Vacuum hose from left carb to advance vacuum pump **
3) Oil vapours return down the air filter
4) Air filter flanges

Also check connections of the fuel reservoir neck and fuel vapors valve near the rear axle.
good luck
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