New exhaust, possibly running rich. - ZX6R Forum
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post #1 of 7 Old 02-28-2017, 11:55 PM Thread Starter
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New exhaust, possibly running rich.

So I just bought a m2 two brothers slip on exhaust for my 2016 kawasaki 636. One of the guys says with the occasional backfiring, that my bike is probably running rich. I emailed Two Brothers and told them about to see what they said "That system is a cat back so your bike should fine, occasional backfire is normal. Your bike was doing it before you just couldnít hear it because of how chambered the stock exhausts are, and I donít believe there is any bike in current production that will ever be rich. They run the bikes lean from the factory for emission reasons so when you do anything aftermarket it makes it even more lean but with a cat still there your not making it a completely restriction free system."

Now my question is, is my bike in fact running rich or how can I tell? This is my first sportbike so Im still learning about how everything ticks lol. Also if it is in fact running rich, I was told I need to get it dyno'ed but that it is expensive to do that. I dont have a whole lot of money to do that so if it is running rich, what would happen if I left it like that?
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post #2 of 7 Old 03-01-2017, 03:00 AM
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It's not running rich.

If it were, that's better than too lean, by far.

You can smell fuel when the bike is cold, because the cat is cold and isn't burning off the normal residue that is always present.

If you have a stock bike with a slip on, you're fine.

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post #3 of 7 Old 03-01-2017, 04:50 AM
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Backfire is due to the PAIR valve. Block off plates will take care of that.

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post #4 of 7 Old 03-01-2017, 10:15 AM
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Yeah, block-off plates. Personally I love the pops out of my exhaust. And no, they run them WAY lean.

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post #5 of 7 Old 03-01-2017, 12:42 PM
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post #6 of 7 Old 03-01-2017, 12:51 PM Thread Starter
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Oh Im perfectly happy with the sound, the only reason I was worried was because one of the guys I ride with said that if I leave it like that then it will decrease the valves life and Ill have to replace them sooner and that itll have worse gas mileage and some other stuff.
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post #7 of 7 Old 03-01-2017, 02:55 PM
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That's complete bs. If you run WAAAYYY lean you can get combustion temps high enough to damage pistons and valves. Unless you strap a nitrous system or a turbo on your bike you don't have to worry about that.
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