they make a few products. valve clean LM 2001, jectron injector cleaner LM 2007, carburetor and valve cleaner LM 2036. these are all added to the fuel. they also make two other products that might be a bit more effective but you are suppose to be a professional tech to use them, pro-line intake system purge LM 2031, and pro-line fuel system cleaner concentrate LM 2031.

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punkinfair