Interesting...
We fixed a sticky exup on a Gen 1 just this week as luck would have it.
The rider (a portly gentleman of middle years) nearly flipped the bike going up the road away from the shop on collection of the bike with an injudicous thottle application in first gear.
He was in again yesterday for the MoT which he had overlooked and told us that the incident was NOT a planned stunt - indeed it was far from planned and somewhat unexpected.
I have no opinion to offer on the benefits or otherwise of a functioning Exup system but I do suspect I have a customer who may have noticed a difference.
Whale
On the Gas!  top
Hmmm , I wonder if he will return to you in a months time for the Quick 8 minute exup valve service now that its functioning OK ? Sounds to me as there is probably a lot of Gen 1s out there bogging around out there with seized or semi seized valves ........ and if thats the case all the moving parts are well worn by now and all the Copper grease in the world aint going to replace that worn metal. Bin the Bitch. :lol
(28-04-13, 09:26 AM)portboy link Wrote: Hmmm , I wonder if he will return to you in a months time for the Quick 8 minute exup valve service now that its functioning OK ? Sounds to me as there is probably a lot of Gen 1s out there bogging around out there with seized or semi seized valves ........ and if thats the case all the moving parts are well worn by now and all the Copper grease in the world aint going to replace that worn metal. Bin the Bitch. :lol
1. I doubt if he will return in a month for a service of the Exup. I say that because we did it properly and that means it will not need attention until the next service interval and then it will need around 20 mins to put right for another interval. It should be a service item but is not on the Yamaha service schedule so often does not get attended to. We do choose to treat it as a service item as to not do so is just asking for trouble later.
2. I feel that your comments around seized and semi seized valves having well worn parts is, frankly, preposterous. How will a seized part wear? It is the friction between two badly lubricated moving parts that causes wear - once the valve is seized, the wear stops. Or am I being stupid here? The lack of wear on my now departed 100,000 miler would tend to support what I say.
Anyway, you clearly have your mind made up about the justification of your decision and no amount of logic, evidence and/or reason is going to change it.
I will now choose to no longer FEED THE TROLLS!
Whale
On the Gas! top
Yes I think you are being stupid here , so I will no longer support saving the "Whale" .
Chortle!
Have to say since I just fixed my EXUP, it has made a significant difference from tickover up. Without an EXUP working properly it's like riding a more modern bike with stuck on the 'Rain' map. Very fluffy and unresponsive at low revs
I might be wrong here, but I think that there's two issues. First, you've got the valve not opening properly, but also, the ignition map is altered if it's stuck.
If you've only ridden with the EXUP stuck, then getting rid of it altogether is an improvement because the ignition is not fully advanced unless the EXUP works. But an Ivanised Fazer with a fully functioning EXUP gives a Fazer the best torque curve possible and does smooth and enhance low rev power. I'm not talking ultimate bhp here but low rev performance, and there are dyno graphs to prove it
http://www.ivansperformanceproducts.com/fz1dyno.htm
or more obviously
http://www.holeshot.com/dynocharts/dyno_fz1_header.html
The full systems, Akra, Holeshot and Yoshi, do not perform as well as the stock headers. I know it's not much of a difference and binning the system doesn't lose that much, but it's a difference you can feel.
I totally understand if you want to bin from the hassle factor alone though.
![[Image: 125377.png]](http://mefi.us/images/fuelly/smallsig-uk/125377.png)
Cost of replacing a worn and corroded EXUP, compared against the slight increase in response, is in my opinion, not worth it, ive rode a Fazer with and with out, and unless your racing, you really are not going to miss it!
Fact!
Don't bullshit me, and I wont bullshit you.
28-04-13, 10:16 PM
(This post was last modified: 28-04-13, 10:17 PM by AyJay.)
Racing's got nothing to do with it. It's low speed around town that you miss the EXUP...
I agree that if you've got a faulty one it's probably not worth the hassle though.
I beg to differ, bike is far more subtle on low revs without the EXUP, making easier riding through traffic, less jerkiness, but in saying that, im making that assumption without riding the bike in the town, just what it felt like when i rode it over mountain roads,
Don't bullshit me, and I wont bullshit you.
"I might be wrong here, but I think that there's two issues. First, you've got the valve not opening properly, but also, the ignition map is altered if it's stuck."
Big up AJ, but is the ignition map controlled by the exup servo assy and if so and left functioning without the cables would the map perform as standard ?
I run the servo without cables on mine (Akra full system, so no EXUP to operate) and can confirm that the ignition timing is as it should be.
Same as i do but minus the Akra system just an open can, so thats two of us running without Exup any more ? :eek
Yeah, but these headers give a good deal more over 4k rpm than the stock headers with EXUP disabled. More than enough to make up for the softer power delivery in the 3 - 4k rpm range.
who are you calling soft !
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