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Xr 4 throttle respone ?'s
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[QUOTE="Hillman, post: 161565, member: 18017"] Skid, I didn't check out mtngoat's link, but I know this much, the XR4 needs to breath more. I agree that your strong hit at the bottom is actually the low throttle stumble described by every XR4 owner, myself included. I don't have the pumper carb yet, but almost eliminated the stumble when I opened the bike up a bit to breath more. I first tried removing the snorkel, coarse mesh on the air filter support and filing out the excess weld on the exhaust header. That helped, but it wasn't enough yet. So I drill four #3 holes in the exhaust end cap between the tubes, and replaced the filter with a K&N. Then I needed to rejet. 3000' 158/60. That's what I did and it is totally a different machine. I certainly didn't invent this stuff, everyone that has looked around the web knows about it, but I thought I would mention it in case. Your brother may not want more power, but I couldn't get it smooth off idle until it flowed more air. FYI, it will never act like a machine with a pumper carb. When you wick open the throttle there isn't enough vacuum to drawn in the fuel needed. The accelerator pump on a Mikuni 36 compensates by forcefully injecting a small additional amount of fuel to reduce this lean condition. Make sense? Kirk Hillman '99 XR4 [/QUOTE]
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Dirt Bike Brands - Other
Xr 4 throttle respone ?'s
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