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I read on another forum about that issue with the 150cc and going with a longer snorkel. From what I read for that style engine you can just go straight up as long as its not too long. It's a known issue and not something random.
If it was me I would put a air filter stem inside a 4inch pvc tube through an end cap (unglued) so the distance is short and place the air filter at the bottom of the tube ... you can put a U bend on the end to keep the rain out or just route it somewhere it will stay dry.
Not sure what it is exactly but to me seems the vacuum point between the air filter and the carb suffers when it is longer. Doesn't get enough air to run right. Engine doesn't create enough vacuum for the longer tube. Just a guess but think I got it right.
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