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ttr250dude

Jetting w/ Lexx end cap and Twin Air filter

2 posts in this topic

I've got an '08 450f with a Lexx end cap and a Twin Air air filter. In the end cap, I'm using the larger bore outlet and no spark arrester or silencer. The Twin Air air filters are slightly smaller than stock to allow more dead space in the air box.

I was thinking a 50 pilot, 170 main, and 2 1/2 turns out on the fuel screw. I like to run my machines a little rich. I'm at 700' elevation and 70-95 degrees. Any input is greatly appreciated.

Thanks, bill804

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I was thinking a 50 pilot, 170 main, and 2 1/2 turns out on the fuel screw. I like to run my machines a little rich. I'm at 700' elevation and 70-95 degrees. Any input is greatly appreciated.

Uh, yeah.

Your pilot should be either a #45 or 48 at the most. You might possibly need the 170 main, but I would bet that a 168 will be closer. Running "a little rich" (or a lot) is not good for an engine. In fact, it washes oil off the rings, contaminates the oil, fouls plugs, and adds to the carbon on th episton and valves.

Read the posts in the fuel system section of Common Threads and browse the '08 jetting sticky.

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