I have heard both. Two intake and three exhaust and 3 intake and 2 exhaust. What is it for sure. thanks guys.

3 intakes and two exhaust, the most important is to fill the cilinder as good as possible with fuel/air mixture. As it concerns the exhaust gasses, they will find their way out anyway.




'99 WR400 F, YZ exhaust, throttle stop trimmed, WR timing, airbox cover removed

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