These things are amazing for the price. Very good quality for the price of two carbohydrates. That being said, I would never consider putting them on and expecting good results without tuning. Bad reviews I guess because of that. I bought these to replace the stems as they were corroded and all the seals were shot. Get all the nozzles and needles, open and sell them. Didn't even know they were sold out. Of course I had to fiddle with the propeller to get it out of idle but they work amazing!
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