Yoshimura R77 dual slip-on - Kawasaki Forum :: KawasakiWorld.com
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post #1 of 78 Old 08-04-2012, 05:38 AM Thread Starter
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Yoshimura R77 dual slip-on

I've ordered Yoshimura R77 dual slip-ons for my 2012 zx14r.
Reasons for this: looks, weight loss, and sound.
I'm not so worried about getting more power, so am leaving stock air filter in place.
Question is this: do I need to re-map fuel?
Will the engine run too lean with slip-ons? Danger of burning a valve?
I really don't want to change ECU or pay big $$$ to dyno tune the bike if it is not necessary.
Here in Australia fitting a power commander 5 and Dyno tune is $1000 range... A bit too expensive for my needs.
Any feedback, comments would be great....


I don't wanna pickle, I just wanna ride my motorcycle...
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post #2 of 78 Old 08-04-2012, 05:48 AM Thread Starter
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More info from Yoshimura

I e-mailed Yoshimura USA and asked them if fitting dual slip-ons requires fuel remapping.... Their answer was NO not required if no other mods were done (eg high flow air filter, flashed ECU, etc.)
Any thoughts or experiences??

I will post pics of my Yoshimura R77's fitted plus fender eliminator when pipes have arrived.


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post #3 of 78 Old 08-04-2012, 06:39 AM
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Their response that no tune is required with just a slip-on is pretty standard across the industry. Although you might gain a couple of HP from a slip-on, the flow characteristics are pretty close to stock without a header change. I wouldn't worry about it.

Looking forward to the pictures and review.
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post #4 of 78 Old 08-04-2012, 06:51 AM
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Quote:
Originally Posted by MoFo View Post
I e-mailed Yoshimura USA and asked them if fitting dual slip-ons requires fuel remapping.... Their answer was NO not required if no other mods were done (eg high flow air filter, flashed ECU, etc.)
Any thoughts or experiences??

I will post pics of my Yoshimura R77's fitted plus fender eliminator when pipes have arrived.
These mufflers are bloody great, good sound, lost lots of weight, and the bike runs a lot better (spins up quicker)




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post #5 of 78 Old 08-04-2012, 07:57 AM Thread Starter
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Thanks for comments so far... Yeah, from what i've read so far, looks like I will be fine without any ECU upgrade/flash/remapping/Dyno tune, etc. It's going to be another week to 10 day wait for Yoshi's to arrive way over here in Perth... But well worth the $500+ savings over local distributors here in 'over priced' WA!
I've got a mate here in Perth who has fitted Two Brother's dual slip-ons, and has been told he has to have a PC5 fitted + Dyno Tune & fuel mapping and of course bring $1000 smackers to the party as well.... This is after paying $1200 for the slip-ons!


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post #6 of 78 Old 08-04-2012, 09:59 PM
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Man those look great! I have kicking around those out maybe 2 brothers black series.

Congrats on your pipes.

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post #7 of 78 Old 08-07-2012, 03:48 PM
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You won't be dissappointed with the R77's mate!

They are awesome and have a sweet note!

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post #8 of 78 Old 08-08-2012, 06:23 AM Thread Starter
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They arrived in the post today!!! Will fit them ASAP and upload some pics, can't wait till after work tomorrow - off with the pumpkin launchers and on with the Yoshimuras!


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post #9 of 78 Old 08-10-2012, 05:17 AM Thread Starter
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Finally fitted the new Yoshimura R77's... they sound deep and have a mean growl... awesome! They are basically straight through, so not much, if any restriction.... any ideas whether it might cause the engine to run too lean at lower RPM?? Yoshimura USA reckon that if you don't modify air intake and just fit these slip-ons than no need to re-map fuel...
http://i1160.photobucket.com/albums/...4/IMG_0825.jpg
http://i1160.photobucket.com/albums/...4/IMG_0827.jpg
http://i1160.photobucket.com/albums/...4/IMG_0828.jpg


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post #10 of 78 Old 08-10-2012, 05:20 AM Thread Starter
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How do I load photos on this forum so they show up when the page is opened??? Anyone know the trick?


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post #11 of 78 Old 08-10-2012, 05:33 AM Thread Starter
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Let me Just try and post these pics again.... Just learning how to Upload on this Forum







Ahhhh.... That's more like it!


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post #12 of 78 Old 08-10-2012, 05:34 AM
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Quote:
Originally Posted by MoFo View Post
How do I load photos on this forum so they show up when the page is opened??? Anyone know the trick?
Choose the IMG code and paste it in the thread.
I am going to have my bike dynoed to check its not running lean, these mufflers sound good dont they???



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post #13 of 78 Old 08-10-2012, 06:35 AM Thread Starter
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They sound Bloody Beautiful, nice growl! There is a slight popping on deceleration... but I don't really mind that. From what i've read it does the same 'popping on deceleration' with the stock exhaust, but you can't hear it. It is part of the 'closed loop' section of the stock fuel mapping that is programmed into the ECU to meet emissions standards...

Right now I funds are too tight for Power Commander 5 and Dyno tune... so that modification will have to wait awhile. Yosimura USA have assured me that fitting only slip-ons and no other air intake mods does not require fuel re-mapping. The problem is if you ring a Dyno Tuning place they of course are going to recommend you get it Dynoed.


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Last edited by MoFo; 08-10-2012 at 06:00 PM.
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post #14 of 78 Old 09-07-2012, 05:13 PM
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Quote:
Originally Posted by MoFo View Post
They sound Bloody Beautiful, nice growl! There is a slight popping on deceleration... but I don't really mind that. From what i've read it does the same 'popping on deceleration' with the stock exhaust, but you can't hear it. It is part of the 'closed loop' section of the stock fuel mapping that is programmed into the ECU to meet emissions standards...

Right now I funds are too tight for Power Commander 5 and Dyno tune... so that modification will have to wait awhile. Yosimura USA have assured me that fitting only slip-ons and no other air intake mods does not require fuel re-mapping. The problem is if you ring a Dyno Tuning place they of course are going to recommend you get it Dynoed.
After finding this, I am going to upgrade my headers to these, with a PC V with Ivan's map.





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post #15 of 78 Old 09-07-2012, 07:56 PM
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I've got a good deal I'm working on a full system right now. If it falls through, I will be getting the Akra header and carbon fiber R-77's.

MoFo, the bike looks great, you're pic have helped solidify my decision---Thank you.
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