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mike592
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when you say cleaned the carb did you clean out the jets, I will say 9 times out of 10 its the carbs that is the issue , check your throttle cable that its as nice free movement , carb slide etc all move freely,then move onto the carb, check your main jet, the pilot seems ok if it's ticking over fine, it seems from what you say that its got to be the main jet as when you open up the throttle and the carb is going from pilot to main jet or one other thing to check is the fuel height on your carb float is too low so not letting enough fuel into the bowl.

have you a manual for air intake screw settings

TIP

I always use a strand from a wire brush which is small enough to get it the small holes and it wont do any damage to the jet ,

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