Hello everyone. I'm a licensed tech and was thinking of installing a PCV, but since my quad was running so well I figured I would make a cheap air fuel gauge before spending almost $400 on a tuner. As it turns out on a 2010 xp 850 Canadian model, even with a custom slip on muffler (arrow) and k&n filter the quad still runs a touch rich. When tuning for power your looking for 13.2/1 air fuel mixture, well at full throttle I'm running at 12.9/1. Idle it runs at 12/1 and just off idle to almost full it runs between 12.5-12.9/1. Needless to say I wasn't going to lean it out a bit because when you are running it hard rich is better then lean. I've attached a pic of my mounted gauge which doubles as a voltage gauge. Cost on eBay for the gauge was $20 and I got a new o2 sensor from a 2013 Honda that has a built in heater for fast/accurate readings. PS the gauge works very well.
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