'Doin' up a 1989 tzr?

[Dave_gimber]

Ok this is just a theory, and there have proberly been loads of other threads like this, BUT- in theory how would i make this bike go faster- simple question, lots of arguing, and thinking i can imagine
What the hell does a big bore kit do? an could i fit one? how much would it cost to fit it to a 125?
I dont really know much about bikes, but can you get 'better' piston rings to make it faster? or better this an that to make it into a turbo acceleration bike *btw thats all i want is pure quick acceleration* like 6 seconds!
And ive already heard enough about race cans and full exhasut systems, so i dont need any info on that thanks
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ChRiS- fUcKs ThE lAw, SmOkEs ThE dRaW, aN lIsTeNs To ArRdCoRe!

[Sparks!]

Racing chain, a new re-inforced power band and carbon tax disc holder would be a good start
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Current Toys: 06 Yamaha WR250F | Nissan 350Z GT | Tech 4 Homes

[Wave2k]

some red stickers will give u about an extra 20Bhp
which in reality is about 40mph
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Ducati 1299 Panigale
2009 Corvette C6 z51
RS125->CBR400->RXS100->GSXR750K2->Ducati749S->CBR600RR5->TL1000R->DRz400->RSVR1000->Honda VTR SP1->CBR400->GSXR1000K6->Honda H100->CBR600RR3->Ducati1299

[Dave_gimber]

WOW! red stickers seem to do the trick quite well! i bet a red paint job would be unbelivable!
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ChRiS- fUcKs ThE lAw, SmOkEs ThE dRaW, aN lIsTeNs To ArRdCoRe!

[Wave2k]

yea now you've got it
on a serious note, i wouldnt bother doing anything, rather do your test, like im doing
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Ducati 1299 Panigale
2009 Corvette C6 z51
RS125->CBR400->RXS100->GSXR750K2->Ducati749S->CBR600RR5->TL1000R->DRz400->RSVR1000->Honda VTR SP1->CBR400->GSXR1000K6->Honda H100->CBR600RR3->Ducati1299

[Dave_gimber]

[Sparks!]

It's like fishing with grenades..... soooooooo easy
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Current Toys: 06 Yamaha WR250F | Nissan 350Z GT | Tech 4 Homes

[MarJay]

Don't listen to anyone on here, put a hayabusa engine in it!

Seriously, Don't tune a 125. Don't waste your money.


Do your test and buy bigger bike, simple.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Ste]

Racing chain is much lighter weight, so get one as soon as you can do!

Power bands, the power band you normally get in a 125 2 stroke is okay, but you can get aftermarket ones which are much more powerful. It will mean your bike has more power all through the rev range.

Get smaller indicators as they have less wind resistance and they weight less as well. Go for carbon effect ones as fair enough they're still plastic but they are actually lighter than the black plastic ones a bit, and it all helps.

You can weight save further by not putting two stroke oil in the bike. It means less weight, and instead of two stroke add to your petrol tank every time you fill the tank up about five spoons full of sugar. This will mean the full burns hotter in the engine so more power and it works better than two stroke as well. So your bike will be like it's got a bigger engine. If adding only five spoons doesn't have much effect try adding a few more as it will make it faster still.

If you follow all this then your bike should go massivly faster and will be like having a much bigger engine in it.

[MarJay]

To add to what Ste said, make sure you ask in the bike shop for an 'aftermarket' powerband!
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Dave_gimber]

y do i bother even asking

[Ste]

[MarJay]

Mr Gimber.

The best way to make a 125 go faster is to sell it and buy a better bike.

If you buy a ratty old 125, the chances are the wheel bearings, head bearings etc are probably shot anyway along with the engine and suspension. There's no point in tuning a 125 if it handles like a bag of arse already.

a £500 125 will be slower than other bikes, its a £500 125 you pays yer money you takes yer choice.

If you really want to go faster, do your test and then buy a 400 or whatever. Throwing money at an old nail is not going to do you any good. By all means ride it to gain experience (we have all been there) but don't go trying to tune it. The money is better spent on rider training.

And that is an honest answer to your question.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Dave_gimber]

[Ste]

If all else fails throw the thing off a big high cliff and it will go very fast.

You want to stop rating replies in this thread as spam and flames, as they're not and your karma will suffer when they get revoked.

[Ste]

Anyway, surely you will know this stuff, as you race a ZX9? And what would someone who races a ZX9 be asking questions about how to tune up a learner bike?

[bikedudextrm]

Is your bike fitted with a YPVS (yamaha power valve system), if you haven't that would make it much faster on the acceleration, should be around 6 seconds with the YPVS system. Basically if you have one, when you turn the ignition on you will hear the ypvs motor turn 2 twice (opens and then closes the power valve).
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https://www.bikepics.com/members/bikedudextrm/

[hugo-a-gogo]

sugar doesn't actually dissolve in petrol, it would just get caught in the filter
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them - but I want one anyway, and on some days I actually believe I need one. That is why they are dangerous."
Hunter S Thompson
clicky 4 bikey

[G]

The money spent on any tuning would be much better used to pass your test (presuming you haven't) and get a bigger bike in my opinion.

From your apparent lack of knowledge on the subjects, I would suggest that you don't attempt to fit a big bore kit.
So, you'd be paying someone to do the work, expect to add a couple of hundred quid extra on top of the parts for a big bore.

A big bore kit usually consists of a new barrel and piston, with a wider 'bore' (width inside the barrel) to make it a bigger engine.
This means the engine is basically a bigger 'cc', ie NSRs are often given 180cc big bore kits.

The bigger engine usually gives not only a bit more top end but a fair bit better midrange.
However you will need a proper race exhaust and to have your carb jetting set up to suit.
</voice of reason mode>


<nasty g mode>
I would have to wonder why you are looking at tuning a 125 when you could just use your zx9 race bike though?

[Kickstart]

Hi

The old TZR125 would manage low 90s top speed in full power form, and probably around 8 seconds to 60, putting out around 20hp true.

You can exchange a small amount of top speed for a small improvement in acceleration by down gearing it.

You can fit a big bore kit. Expect the rest of the engine to have a much shorter life expectancy if you do this.

You could try finding an fitting a suitable larger carb. This would help, but expect to blow the engine up a few time while you try and get the jetting right.

A performance exhaust might help, but to be honest the standard TZR exhaust wasn't bad.

Overall, compared to the value of the bike, none of these ideas is good value. It would be cheaper and more reliable to sell the TZR and buy an RS125 / Mito / NSR.

All the best

Keith
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