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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZF250/WR250F Carb-3rd Jet
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[QUOTE="wrooster, post: 117928, member: 21800"] 40+, never heard of the "3rd jet". furthermore, the keihen FCR carb is a complicated piece of engineering. the apparent simplicity of a carb as described in academic "fundamentals of internal combustion engines" books and as implemented on your lawn mower fools you into believing that it really is simple. your lawnmower operates at a single speed under a relatively constant load, that's why the carb design is simple. but a motorcycle application that requires smooth idle, good midrange acceleration, and top end performance, all in concert, is a real trick. thus the need for a design that is actually a few carbs in one, with lots of needles and valves and so on to cover the entire operating range and to provide smooth handoff between operating regions. screwing this whole thing up is that we operate the bikes at differing altitudes and temps and with varying qualities of gas. where is this 3rd jet in the following link? [url]http://www.onlinemicrofiche.com/OEM_Images/yam_db_images/01YZ250FNB4.GIF[/url] ps personally i believe that canondale, while not having the "complete package" in terms of a race ready bike, is bringing some fresh air to the commercially produced moto game with technology like fuel injection. yes, there are some drawbacks, e.g. the need for DC power for startup and so on come to mind, but at least they are pushing the envelope a bit. but as we've seen in the automotive industry, these problems can be solved and then the ECU "black box" can deal with issues like varying temps and fuel quality and so on to give maximum performance under all conditions. i mean, how long did it take to bring ABS as used on commercial aircraft to general use on cars, and finally to sport bikes? another example, my car has stepless variable timing for both camshafts, bmw calls it double-VANOS, and it too is controlled by the ECU. the result is excellent fuel economy and good low and hign rpm performance. give them a couple of years and yama or honda will figure out how to do the same for a midsized and up 4 stroke. the wrooster [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZF250/WR250F Carb-3rd Jet
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