My take on the exhaust valve removal - Kawasaki ZX-10R.net
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post #1 of 35 Old 06-08-2007, 09:16 AM Thread Starter
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My take on the exhaust valve removal

Let me start by saying I used the search function and read all the posts regarding this. This isn't about what it does or how to remove it. It is about my impressions after disabling it. I have had my 10 for 2 years and just left the valve alone even after putting on a Leo Vince slip-on. So last weekend I started to research it again and decided since it was so easy to do why not try it and test it since it is reversible and takes about 5 minutes to do. I wasn't expecting any type of huge gain or even a noticeable difference. But I was more than suprised when I took it out afterwards to ride it. First thing is throttle response was GREATLY improved. This was the biggest thing for me. I always disliked the abruptness of the on/off throttle of the 10 especially in mid corner. Well that has been totally resolved. Next thing was the power characteristcis. I can't say I noticed any loss in low end. What I did notice was an increase in the mid-range hit. My front wheel wants to come off the ground anytime I get near that sweet spot more so than it did before. The motor also seems to rev faster. It just seems to build steam quicker so maybe that's why I didn't really notice any loss of low end. Now I am not saying that this gave me 10HP or anything. What I am saying is I think it improved the power charateristics. I do wonder if it was possible that the valve wasn't functioning properly since I saw in some of the posts that this was the case on some 10s. I know for me, its a good mod and I am keeping the valve disabled.
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post #2 of 35 Old 06-08-2007, 09:47 AM
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im going to tinker w that right now. how-to?

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post #3 of 35 Old 06-08-2007, 10:16 AM Thread Starter
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There is a thread out there with pics on how to. All I did was get to the servo, use an 8mm socket and remove the pulley that the wires connect too. No FI light that way and no issues thus far. If you don't like it after you disable it, just re-attach the wires and bolt the pulley back on. Literally took me 3 min to do.
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post #4 of 35 Old 06-08-2007, 10:57 AM
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Its conceivable that the cables stretch(like any) over time therfore the valve isn't functioning properly hence one possiblity why these bikes perform differently one to the next.
No doubt the disabling of the valve alters the bikes character and some may prefer it this way.

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post #5 of 35 Old 06-08-2007, 06:51 PM
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I had to go try it.. (Especially since it takes five minutes to do). I felt that the engine hit earlier (about 1000 rpm sooner than it did before.) I thought that there was a little loss of low-end, but not enough to really make any difference. I'll have to go race a gixxer before I make my final analysis though. The big question is, will it cause any unnecessary damage to the bike????

What can I say...I like the factory bikes!
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post #6 of 35 Old 06-08-2007, 08:03 PM
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Quote:
Originally Posted by nite-ryder View Post
I had to go try it.. (Especially since it takes five minutes to do). I felt that the engine hit earlier (about 1000 rpm sooner than it did before.) I thought that there was a little loss of low-end, but not enough to really make any difference. I'll have to go race a gixxer before I make my final analysis though. The big question is, will it cause any unnecessary damage to the bike????
No damage at all.
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post #7 of 35 Old 06-09-2007, 01:47 PM
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I'd like to see a dyno output comparing with valve and without. I suspect that any valve further downstream than the collector is really no more than a noise valve, for passing whatever laws exist in the customer country. I've wired the valve open on my 636, partly because it seizes up, and I can't say I've noticed any difference either way. The valve on the 2006/7 ZX10R is closer to the headers, but I'd still be surprised if there's a huge effect, but a dyno run would settle the matter.
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post #8 of 35 Old 06-09-2007, 08:10 PM
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You certainly get more noise and this sometimes contributes to the feel of more pull.
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post #9 of 35 Old 06-09-2007, 09:20 PM
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Quote:
Originally Posted by doug_uk View Post
I'd like to see a dyno output comparing with valve and without. I suspect that any valve further downstream than the collector is really no more than a noise valve, for passing whatever laws exist in the customer country. I've wired the valve open on my 636, partly because it seizes up, and I can't say I've noticed any difference either way. The valve on the 2006/7 ZX10R is closer to the headers, but I'd still be surprised if there's a huge effect, but a dyno run would settle the matter.
don't know about the 06-07 but there are many threads about this

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post #10 of 35 Old 06-09-2007, 10:44 PM
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I took mine off and it's great. No complains here and its been about a month.

"Never trade the thrill of living, for the security of existence"
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