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Dirt Bike Brands - Other
426F cyl. head
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[QUOTE="Rich Rohrich, post: 125999, member: 16241"] If you aren't satisfied with the stock performance of the WR (pretty unlikely) there is very little that you need to do. Everyone starts by cutting the throttle stop to YZF specs so the throttle opens all the way. If you are still looking for more you can retard the exhaust cam 1 tooth on the cam gear to set your WR to YZF cam timing, uncork the exhaust by using a Vortip exhaust insert or something similar, get the jetting sorted to your liking, fill it with good gas and leave it alone. The rest of the stuff you've described is essentially a waste of money and time on this engine for the vast majority of riders. The specifics: - Polishing the exhaust is just BS eye candy on ANY engine - The ports, manifold junctions and valves/seats in WR/YZF cylinder head are remarkably good stock so unless you are taking it apart for some other reason don't bother. - The cam acts directly on the valve bucket so there is no rocker. The lift is more than adequate stock, and the profile is VERY GOOD. - The ignition timing is fixed unless you pop for a $400+ programmable ignition, and unless you have a lot of experience testing curves it's pretty hard to improve on the OEM setup. -The stock air filter flows the same as a TwinAir on my flowbench but doesn't seem to be as rugged so the TwinAir IS a worthwhile investment from a durability standpoint - Once you change to a less restrictive exhaust insert the OEM pipe and silencer is hard to beat. Be happy, you bought an incredibly powerful well engineered motorcycle that is difficult to improve on with ancient hot rod techniques :) One last thing. Make sure you lock the doors of your truck when you park at Chicago Cycle. You never know what kind of creepy freaks might be wandering around in that neighborhood :eek: [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
426F cyl. head
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