Four Stroke Tech has a big bore kit for a 300ex that bores it all the way out to 354cc. Woulden't the sleeve have to be really thin or would the cylinder need to be machined to fit the new sleeve? Has anyone ever bought this.
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never 2 fast never 2 big
Four Stroke Tech has a big bore kit for a 300ex that bores it all the way out to 354cc. Woulden't the sleeve have to be really thin or would the cylinder need to be machined to fit the new sleeve? Has anyone ever bought this.
Senior Member
are you sure its FST? their website says they only make 330, 380, and 390 kits for them.
03 Predator
Cody_LTR
That kit would have to come with a new sleeve, I think after .120 (305cc's) You cannot go any further, if any. With a new sleeve you will have to get your old one pressed out and the new one pressed in by a machine or possilby by your local honda shop.
2006 White Suzuki LTR450 - Cherry Bomb - SOLD
97' BMW ///M3
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Senior Member
FST sells 380/390 kits and the sleeve he runs with those kits has the same thickness as the stock bore sleeve.
don't buy from Paul Corbin aka TampaBoy813
01 492ex
Senior Member
the cases prolly have to be machined aswell
Present Bikes
1) 87' 250x/350x hybrid
2) 89' honda 250r
past bikes:
87' 250r
00' 330ex
04' 400ex
86' lt230s
84' atc110 blue sweet heart
Senior Member
my buddy had a 390 in a 250x that thing ran , stroker crank and head work is a must mickey at fst does great things my uncle is running the 288 and it is a great up grade too maching of the cases is required
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