Thunderace Question

I'm looking at what looks like a very tidy Thunderace at the mo, and
the owner has told me that it has a full Akrapovic system, and as a
result of this, the EXUP system has been done away with.

So... assuming it's been set up properly on a dyno and rejetted etc to
match the exhaust, will it affect the bottom end grunt by much given
the bike was designed to take advantage of the EXUP system.

TIA

 

Hmmm EXUP is a great system and the bikes, on the road, seem to better
with. Still be a good bike though and it is the best of aftermarket
gear.

 

If its omission means it holds back a little more than normal before
kicking in the top end when you open it right up, then I don't
actually see this as a bad thing given what I want from a bike.

I'd just rather not end up with something with a big stuttery hole in
its mid-range, which is what I believe they can end up with if they're
properly set up post EXUP removal.

That, and it's too far from here to really pop along to find out it's
horrid to ride before agreeing to buy it.

Aye... and the price is very keen too, so I'm very tempted.

Ta for the info anyway.

 

"JackH" <> escribió en el mensaje de noticias

If its omission means it holds back a little more than normal before
kicking in the top end when you open it right up, then I don't
actually see this as a bad thing given what I want from a bike.
I'd just rather not end up with something with a big stuttery hole in
its mid-range, which is what I believe they can end up with if they're
properly set up post EXUP removal.
That, and it's too far from here to really pop along to find out it's
horrid to ride before agreeing to buy it.

Aye... and the price is very keen too, so I'm very tempted.

I still own, enjoy and love one of those old dogs. What you say about the
Akrapovic is right, but shouldn't be a major issue. Try iy and decide
whether you like it or not.

'ace of mine has the *last* Yoshimura made for this model, special offer 160
EUR from Yoshi HQ's to my door. I don't notice any special gain, but
arriving to a city red traffic light ar 65mph in first gear (5 gears, mind)
and then letting the engine stop ("reducir"?) sounds so f*cking gorgeous
now...

 

I would assume (and I'd betcha that no bugger here has ever had
experience of an 'Ace that this has been done to) that there's a loss of
bottom end (having ridden an 'Ace with a seized EXUP, as I expect you
have).

Yes, a /full/ Akro system is alleged to give any litrebike 10% more
everywhere and /if/ it has been jetted and set up /properly/ it may be
better than an 'Ace without EXUP - but will it be as good as an 'Ace
/with/ EXUP - that's the vital question.

Another good Q for you - how will it affect the Nigeing Quotient, when
you come to punt it on (as you inevitably do, although <cough> to be
fair <cough> it usually takes you longer than 48 hours to do it ) - or
will you have to put it back to standard and fence out the Akro system -
and how many punters will there be for that, bearing in mind the 'Ace
was always underrated and a bit of a niche bike and rather more of a
tourer than a sprots machine.

A further Q - why would somebody want to do that to an EXUP bike? Akro
systems are fearsomely expensive, much more so than replacing a fucked
EXUP valve.

The only way to find out is to go and ride the thing. Then report back,
obviously.

 

They work when new, however on a bike as old as a Thunderace they will
either:

a) seize, not work and be impossibe to get out without an angle
grinder to the cover bolts

b) Snap its cables resulting in a "How effin much moment for a bit of
wire ?" at your local Yamaha dealer

c) Get slow with age cutting power without you noticing

d) rattle so much it will spoil any attempt to look cool no matter how
fast your bike is.

 

e) rattle so much it will help any attempt to look cool by sounding like
a Ducati

 

Not an 'Ace, but a late FZR1000EXUP, hence why I'm aware of what kind
of flat spot you can end up with.

It sort of reminded me of a TZR125 when you locked the power valve
open in terms of the '(stuttering) calm before the storm', albeit the
FZR was obviously a hell of a lot quicker once the power kicked in.

Anyway, it's something I don't really want at my time of life, much as
I sort of preferred TZRs with that kind of power delivery 'back in the
day' over those with the servo kit fitted.

Well yes... and I'm not too fussed about an extra 10%, tbh... or that
it's an Akro system.

More I'm concerned about ending up with something not all that nice to
ride unless your bag is riding something above so many revs all the
time... and yet again I refer Sir back to the comment above about 'my
time of life'; I want something pokey but not to the point you have to
wring its neck all the time.

I've been offered it for £1100.

It's very tidy and sensible miles too... so I think given they tend to
be £1300 upwards, it should sell as is for what I've paid for it if I
get that bored with it that quickly.

Well... at a guess the standard downpipes etc had probably rotted
through as well, so they decided to replace the whole lot.

If the owner gets back to me any time soon, I may ask them. ;-)

Also on the possibility list: Thundercat, ZZR1100 and the ubiquitous
CBR600 (1), all from within the mid 1990s to 2000 bracket.

The main reason I'm looking at ZZR1100s is it would appear they're
good on fuel on longer runs and the insurance for both these and the
'Ace is a lot less than I was expecting.

Like I said, way too far for me to go down to unless I'm going to end
up riding it back, really.

(1) Yes, I know... 'no such beast exists', but I've had generally good
experiences with these and it appears you can pick up a half decent
one now for relatively little.

 

T/aces have enough grunt at the bottom end that no-one really notices
if the Exup fails and is then stuck in the open position. I'd rather do
away with Exup valves cos they are a troublesome PITA on even slightly
older bikes.

 

Bad form and all that, but I've also noticed that Pans Europeans
aren't all that dear these days either, and so they're on the list as
well.

Yes, I know it's a mixed bag of possibilities, but anything has to be
better than the Diversion 600 I've just got rid of. ;-)

The main things I do know is that I'm not up for anything as extreme
riding position wise (1) as the R6 I had last year, as a main bike
anyway... that, and I'm bored of VFRs, so they're out the question as
well.

(1) As in, I can't get on with anything that'll be as hard on your
wrists after five minutes of enthusiastic scratching.

 

I've never really understood why anyone *would* be bothered about an
extra 10%, unless they're either racing or going for full-on flat-out
ultimate power by tuning the nuts off a modern litrebike (or, as I shall
call it, The Bonwick Exception).

I was toying with the idea of getting another SV650 for commuting
recently, but finding one that hasn't had a sodding race can fitted is
almost impossible. "Sounds gorgeous" - no it doesn't, it sounds
completely gash!

You only say that because you haven't got an RGV in the garage.

Go on, you know you want one.

 

Baguette, sir?

 

Well some people are never happy at a guess... hence why I suspect
someone round my way had a turbo conversion done to their Hayabusa a
few years back.

I must admit, I've seen (or should I say heard) a couple of SVs with
what sounded like straight through cans.

Not exactly inconspicous.

Maybe when I've laid off the pies for a while. (1)

(1) 'Pies... I can give them up any time I want to... can't I?'

 

There's a monumentally huge difference between strapping a turbo on a
busa and getting a 10% power increase from a full race system. Or, at
least, if there isn't somebody should be looking for a refund.

All mouth, no trousers. An exhaust note that promises so much yet
delivers so little.

 

That much more grunt than an FZR?

Only the one of those I rode with the offending valve playing up was
positively horrid and gutless below about 4k (1).

(1) Or thereabouts... must have been about 8 years ago that I rode
that, so the memory isn't exactly fresh on that one.

 

The T/ace has more power and torque than a FZR to start with - granted
it's not a great deal more but it helps.

If the Akrapovic has been set up properly on a dyno then I don't see a
problem.

 

I do... someone else has now bought the bloody thing.

Back to the drawing board.

 

I thought that was a *lovely* pluralisation.

 

He that hesitates ...

... has to re-sketch his future.

Use charcoal, it rubs out easily.

 

20 valves help, 20-30 kg less help.