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Dirt Bike Brands - Other
426F cyl. head
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[QUOTE="Rich Rohrich, post: 126467, member: 16241"] It's not being a pest unless you plan on asking "what color grips should I buy?" :silly: On the subject of pipes, it's not surprising that you were able to find one that gave better off idle response than the stocker. There is a pronounced dip in the torque curve at low rpm where the stock pipe and intake are out of tune. Using a pipe tuned to a lower torque peak via a smaller pipe ID or longer primary header length will shift the bulk of the torque curve area to a lower rpm at the expense of breathing at higher rpm. Fixed length exhaust systems can only be tuned over a fairly narrow speed range, so it's a balancing act to find the sweet spot. For MX use Yamaha seems to have hit it fairly well, for other purposes maybe not. Many of the aftermarket pipe companies seem to lack the most rudimentary knowledge of how engines work as a system and just hang well constructed but poorly engineered pipes on these bikes. With this approach it's not surprising that there are so few riders seeing real improvements from pipes. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
426F cyl. head
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