The carb has to come out. You may try to soak the bolts every few hours with PBLASTER, but it may not help. Heat often works, just be careful how you heat. Empty all nearby fuel and be sure you dont have any in the bottom of the hull. Protect anything that may be a problem with a heat sheild. Flames and explosive gas vapors arent a good situation in what may be doing. A heat gun is you best bet. In any case, they have to come out. Broken or not, you may have to deal with the broken bolts after you get it out. Using carb cleaner is not going to help.
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