Z650 Yoshimura Alpha Install - Page 3 - 2017+ Kawasaki Z650 Forum
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post #21 of 57 (permalink) Old 05-08-2018, 09:04 PM
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The Yoshimura Alpha is an approved Kawasaki aftermarket exhaust. It was designed and tuned to run within the stock ECU settings. You do not need an aftermarket fuel controller in most cases with this system. I dyno tested the Z650 stock, and with the Yoshimura Alpha (baffles removed) and it was lean as expected, but within normal limits. I do recommend a fuel controller with this bike though. The difference on a proper tuned setup is amazing!!
Thanks Tremonte!
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post #22 of 57 (permalink) Old 05-10-2018, 06:04 PM
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amire, how did you get flames to shoot out of yours?
It does that when cold 🙂
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post #23 of 57 (permalink) Old 05-21-2018, 06:42 PM
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Originally Posted by Tremonte View Post
The Yoshimura Alpha is an approved Kawasaki aftermarket exhaust. It was designed and tuned to run within the stock ECU settings. You do not need an aftermarket fuel controller in most cases with this system. I dyno tested the Z650 stock, and with the Yoshimura Alpha (baffles removed) and it was lean as expected, but within normal limits. I do recommend a fuel controller with this bike though. The difference on a proper tuned setup is amazing!!
Newbie here - does it even make sense to take a bike on dyno without fuel controller? Can they do anything with only OEM CPU? Thx
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post #24 of 57 (permalink) Old 05-21-2018, 10:06 PM Thread Starter
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You can have the stock ECU reflashed by an experienced tuner. At the time of original posting, the hardware wasn't available, but it is now. The reason I took it to the dyno before and after the install, was to get some solid air/fuel ratio numbers and HP gains out there.

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post #25 of 57 (permalink) Old 05-21-2018, 11:48 PM
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Originally Posted by Tremonte View Post
You can have the stock ECU reflashed by an experienced tuner. At the time of original posting, the hardware wasn't available, but it is now. The reason I took it to the dyno before and after the install, was to get some solid air/fuel ratio numbers and HP gains out there.
Thanks man
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post #26 of 57 (permalink) Old 05-24-2018, 01:04 PM
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Anyone else have their bolt/rubber stopper fall in between the pipe and muffler? What a stupid design.

Any advice on how to get them out? @Tremonte bike god
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post #27 of 57 (permalink) Old 05-24-2018, 06:15 PM Thread Starter
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Anyone else have their bolt/rubber stopper fall in between the pipe and muffler? What a stupid design.

Any advice on how to get them out? @Tremonte bike god
Lol... yup! Had that happen to me first time trying to put the db killer in. I had to take the silencer off and roll it around until I got it back to the hole, then pulled it out with a tiny pair of needle nose pliers. Terrible design for that

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post #28 of 57 (permalink) Old 05-29-2018, 06:34 PM
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Does anyone have the torque spec for this install? I do not feel like buys a service manual just for the exhaust installation, thanks for help
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post #29 of 57 (permalink) Old 05-29-2018, 06:48 PM Thread Starter
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15ft-lbs on exhaust nuts. About all you need.

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post #30 of 57 (permalink) Old 05-30-2018, 03:28 PM
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15ft-lbs on exhaust nuts. About all you need.
Thanks! So all nuts who does not have torque specified in Yoshimura guide I should tight to 15? Sorry for additional answer I am newbie into this.
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