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Modifying a Tohatsu M40D
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<blockquote data-quote="Lil&#039; Blue Rude" data-source="post: 340563" data-attributes="member: 4627"><p>Yeah they're like a tuned pipe except they only draw gas out where a tuned expansion chamber would draw gas out and before the port closed again it would stuff part of the charge back in. I wouldn't have a clue what size jet to go up to. When I've done tuners on mine I've went up 2 or 3 sizes. You might want to go up more then that and just check your spark plug color and keep leaning it out until you get that nice light brown coloring. But I'd at least go up 3 sizes starting out. Hydro tec might make you one. Not sure if they would or not.</p></blockquote><p></p>
[QUOTE="Lil' Blue Rude, post: 340563, member: 4627"] Yeah they're like a tuned pipe except they only draw gas out where a tuned expansion chamber would draw gas out and before the port closed again it would stuff part of the charge back in. I wouldn't have a clue what size jet to go up to. When I've done tuners on mine I've went up 2 or 3 sizes. You might want to go up more then that and just check your spark plug color and keep leaning it out until you get that nice light brown coloring. But I'd at least go up 3 sizes starting out. Hydro tec might make you one. Not sure if they would or not. [/QUOTE]
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