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Old 04-16-2004, 11:17 AM   #1
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Default 15FE new carb?

I've had my Rs4-2 for about 3 years . The 15Fe just screams with power.I have a mips racing clutch,ported Cen header ,tune pipe. I'm wondering would I get anymore speed out of this If i put a 6mm slide carb on? 4mm rotory on it now.If so what carb do you recommend? or would it be wasted fuel?Thanks
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Old 04-16-2004, 11:40 AM   #2
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A screaming power .15fe thats new to me
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Old 04-16-2004, 12:28 PM   #3
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The oscv slide works nicely. And yes you will see a difference in power.
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Old 04-16-2004, 12:50 PM   #4
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Originally posted by rodrigo1508
A screaming power .15fe thats new to me
exactly my thought, even leaned out my .15fe couldn't beat my bike(not motor, the one with 2 pedals and 18 gears)
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Old 04-16-2004, 01:03 PM   #5
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Go with the OS like ncc said. I bought the upgraded HPI 5.5mm carb and it broke within a couple months without even being wrecked. they don't seem to like hard driving. The OS should be pretty tough, plus it's a slide card. You will have to modify your throttle linkage. I think HPI sells a kit to convert to a slide carb.
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Old 04-16-2004, 01:20 PM   #6
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I've ported and pollished the sleeve and intake on the crank and with the cen header ported and pollished.I milled down the heatsink head slightly for more compression also. I figured it's getting starved for fuel now.It's funny, at the track people come up and ask what I running for a engine and I laugh and say just a crappy old 15fe. I might still just bore out the original carb,there's still room but I thought the low idle adjustment would be nice too
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Old 04-16-2004, 01:33 PM   #7
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By your theory....4mm bore vs 6mm, you will see the improvment of the power....just like the SIRIO 15, someone dropped a slide Nova Rossi carb (5mm instead) and can tell the power was reduced compared to the rotary SIRIO oem carb that has a 6mm bore.

But, like others....I have a difficult time to imagine the "SCREAM" effect from a 15FE.....does that make about 1.3HP....? Not making fun of you, just wondering after all the mod and would like to know how much HP increase
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