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I strongly suggest that you contact FTI directly.
HP ratings on transmissions can be misleading. For what you are doing a PG with a good aftermarket case preferably a Reid, an...
I would not go to a narrower belt. Do you what length your belt is? What are the numbers on it? Is it an 8mm, 11mm, 13.9mm or 14mm pitch?
How wide is your idler and pulleys?