I probably ought to know this already but.....

How have you made your GTS go quicker?

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stevewp
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I probably ought to know this already but.....

Postby stevewp » Thu Jan 21, 2010 10:14 pm

.....what size is it you have to overbore to in order to cure the oil loss?

Am I right in saying it's 1130cc?

Anyone got any ideas of costs for the work, on a ride-in ride-out basis?
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Re: I probably ought to know this already but.....

Postby rooyenan » Thu Jan 21, 2010 10:44 pm

stevewp wrote:.....what size is it you have to overbore to in order to cure the oil loss?

Am I right in saying it's 1130cc?

Anyone got any ideas of costs for the work, on a ride-in ride-out basis?


According to Mike, it's either 1040 or 1070 (which I can find on the internet..)
http://www.gtsclub.org/forum/viewtopic. ... 39d845be1b

But beware! Ride-in ride-out solution can cost serious money!! (1000,-- or more)
My son's GTS has a 1040 overbore kit installed and still is using oil (ok...not as much as it used to, but the use is still there!)

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Postby Daf » Thu Jan 21, 2010 11:01 pm

I guess the big bore reduces oil use if you have oval bores or excessive wear, in which case the answer will depend on the amount of metal you have to remove to get overcome the wear. biggest is best I suppose.

Rooyenan did your large oilfilter make a difference?

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Postby rooyenan » Thu Jan 21, 2010 11:46 pm

Daf wrote:I guess the big bore reduces oil use if you have oval bores or excessive wear, in which case the answer will depend on the amount of metal you have to remove to get overcome the wear. biggest is best I suppose.

Rooyenan did your large oilfilter make a difference?


That oil filter is not bigger, it's washable and the outside is billed aluminum (giving more cooling).
Still have to change the oil once more and clean out the oil pan..
Bit too cold outside at the moment...

I sure do have the impression it helps!!

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Postby wheeler » Fri Jan 22, 2010 11:27 am

Well...
ewen if your bores are oval the 0,2mm owerbore would be enough (if only there were pistons of that size that you could buy).
So 1040 cc is enough and you dont have to change the sleeves (on 1070 you got to change the sleeves).
If your bores are perfectly round then it can help if you let the expert rehone your bores and you instal new standard pistons (that can be done only if hte cilynder wals are not scuffed (vertical scratches from piston and pistonrings due to lack of oil supply)).
After a good rehone job and new pistons the engine is in most cases like new .
The hone job must be done perfectly (not to fine and not to rough).
To fine of a hone job will not let the new piston rings to seat properly (fault of Yamaha on this engines was to fine honed cilynder surface so it weared out to soon) and your engine will still use oil.
To rough honed surface will allso cause a oil comsumption problem as it will let to much oil to seat in the surface and it will be burned together with fuellair mixture. And it can cause ewen a piston ring burn thru...

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Postby stevewp » Fri Jan 22, 2010 1:12 pm

I thought the 1040(or 1070?) bore didn't eliminate the oil loss due to oval bores.

As I understood it, you had to go to the next size bore to grip that problem, which I though was 1100cc+
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Postby rooyenan » Fri Jan 22, 2010 1:27 pm

stevewp wrote:I thought the 1040(or 1070?) bore didn't eliminate the oil loss due to oval bores.

As I understood it, you had to go to the next size bore to grip that problem, which I though was 1100cc+


1040 should do!! 1070 is only possible with resleeving..

Above 1100 does not exist for the GTS.. (And YOU'll never be any faster anyhow) :twisted: :twisted:

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Postby stevewp » Fri Jan 22, 2010 1:48 pm

Not bothered about the speed, in all honesty, although obviously a few extra horses would be a nice side-effect.

Thing I want to be sure of, if I was to do it, is that it does the job. Wuold be gutted if I had it done, only to find it's still using oil by that method. So if I had to go bigger and have it re-sleeved, I'd rather that than have it redone or not cure the problem.
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Postby rooyenan » Fri Jan 22, 2010 1:56 pm

The 1040 solution should do!

My son has this in his GTS: It does not stop oil consuption completely, but shure bring it down to acceptable levels..

His bike is using approximately 100cc in more than 4000 miles.
(that is not always below 4000 rpm...)

The 1040 solution is also the cheapest solution! Resleeving is expensive!!

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Postby stevewp » Fri Jan 22, 2010 2:11 pm

Hmmmm....ok. Certainly is a big improvement.

Now to get some prices.........
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Postby 24c » Fri Jan 22, 2010 8:40 pm

stevewp, go for the 1040 Wiseco kit, as wheeler & rooyenan said, you don't have to change the sleeves/liners, or machine anything else.

A 1040 does cure the oil leaks on the bores only, ( as wheeler says 0.02mm+ will cure ovality)...you still need to do the guides/valve oil seals to do a proper job. Incidentally, a tuner buddy says no FZRs or race YZFs ever had this problem (that he's built), so it's a machining issue with the GTS for sure...or crankpin offset/float.
I've just started riding the GTS again, and it'll be changing

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Postby stevewp » Fri Jan 22, 2010 9:07 pm

Cheers Mike. After all that, it looks like my opportunity for affording it has gone out the window :(

However, if it reappears, I'll likely put all your help to good use.

Sorry guys :(
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Wiseco kit

Postby 24c » Fri Jan 22, 2010 9:12 pm

Yep, it's a lot of money in the UK, bank on a £100+ on gaskets, £400 on the kit, and then you'll need a rebore at sub £100, and that's before your time ripping the stuff out of the bike etc.

PS I was lucky I got my Wiseco stuff on UK eBay for a good price...£160! :oops:

PPS There is a cheaper option, but I can't tell you this, it's not for DIYers :twisted: :evil:
I've just started riding the GTS again, and it'll be changing

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Postby stevewp » Fri Jan 22, 2010 9:29 pm

Ha ha ha. Fair cop!
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Re: Wiseco kit

Postby rooyenan » Fri Jan 22, 2010 9:33 pm

24c wrote:PPS There is a cheaper option, but I can't tell you this, it's not for DIYers :twisted: :evil:


What option is that, Mike??

Send me a PM please!

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