SV 650 Big Bore kits?

Originally Posted by lylej

besides your insurance will go through the roof, dont tell them and something happens and all your money has drained away.

How would the insurance company know? Unless it was binned at an improbable speed.

Apart from possibly shortening the life of the engine, but they last to over 100,000 miles anyway, why should the servicing costs be any more than a 650?

Ducati get reliably 90/100 bhp out of the 750. Cambelts and electrics not withstanding. So 80/85 should be possible from a BB. Maybe!

[northwind]

Originally Posted by SV650Racer

If you know what your doing and the SV is well setup then its more than a match for bigger bikes.

Aye, but there's the rub... If you know what you're doing. Plus, there's a bit more to your bike than a big bore kit

Question for you... If you were on a properly race prepped GSXR750 at broadly the same level of tune and spec as your race SV, would you not expect to be faster than you are on the SV?

maybe that will be summat to look at doing when me chops finnished then, mite even go all out and start from scratch with it and just use the existing geometry as a benchmark.
cheers peeps...

[northwind]

Originally Posted by petevtwin650

Apart from possibly shortening the life of the engine, but they last to over 100,000 miles anyway, why should the servicing costs be any more than a 650?

Lifespan's a bit tricky, an SV engine it seems will last 100-200 thousand miles before wear and tear gets it, or at least calls for heroic measures that aren't worth the cost. But, there's also a risk of what you could call premature failure- cranks or rods snapping, valvetrain dropping, rings disintegrating, loss of gears etc. More unpredictable, those, that's why one bike that last for quarter of a million miles or one that spits a valve at 10000 don't really tell you anything about lifespan or durability- and even if you got a rash of failures at low life after a big-bore, say, you never know the actual cause- it could have been a defect that would have led to a failure anyway.

Basically, cut a long story short, it's not as easy as taking 50% off a 100000 mile engine life, that'd be ace since most of us won't do that many miles In fact, a 700cc motor could easily outlast many standard ones, because of the random factor.

Originally Posted by northwind

Aye, but there's the rub... If you know what you're doing. Plus, there's a bit more to your bike than a big bore kit

Question for you... If you were on a properly race prepped GSXR750 at broadly the same level of tune and spec as your race SV, would you not expect to be faster than you are on the SV?

Maybe i would...maybe i wouldnt. I have seen a few people take the plunge and go slower on a bigger bike!. In fact my thing was to do Superstocks next year on a 750...as it can be ridden easier and quicker than the 1000. Proving that it isnt always horsepower..handling..flickability and the the ability to get on with and make the best of the bike you have. In fact i have doubts about changing..the sv is so awesome to ride..but anyways. The point was that the SV if you want to spec it up..instead of buying something else can be a real mean tool.

[northwind]

Originally Posted by SV650Racer

Maybe i would...maybe i wouldnt. I have seen a few people take the plunge and go slower on a bigger bike!. In fact my thing was to do Superstocks next year on a 750...as it can be ridden easier and quicker than the 1000. Proving that it isnt always horsepower.. handling..flickability and the the ability to get on with and make the best of the bike you have. In fact i have doubts about changing..the sv is so awesome to ride..but anyways. The point was that the SV if you want to spec it up..instead of buying something else can be a real mean tool.

Fair play, I suppose I hadn't looked at it quite that way, ability isn't an absolute is it? Some people find a bike that suits them and get better results out of less. Suppose that's me in fact! I just think of it as a preference for small bikes but I reckon I'd be quicker round knockhill on my own bike than on a new CBR or whatever, even with acclimatisation. Good point...

I get a bit narked at the people who're obsessed with making the SV more than it is, is all Yes, you can build a 100bhp SV that weighs 150 kilos, and it'll beat any production 600. But then, you can overtune and underweight a 600 as well and we're just back to square one, but with lighter pockets.

True..but making one of your favorite bikes...and tinkering late at night is all part of the fun!!!!!! :@>..plus i love it when you declare to someone it isnt a SV1000....and the look on their faces...makes it all worthwhile

[northwind]

Originally Posted by SV650Racer

True..but making one of your favorite bikes...and tinkering late at night is all part of the fun!!!!!! :@>..

Preaching to the choir Ah, well, worse things happen to choirboys I suppose. I used to get asked if mine was a TL, back when it had the twin cans, that was good too. But more fun is asking someone on a trackday who's on a thou where they got the twins for their 650, then looking all surprised when they say it's a thou. "But... I overtook you twice!"

Originally Posted by petevtwin650

How would the insurance company know? Unless it was binned at an improbable speed.

Apart from possibly shortening the life of the engine, but they last to over 100,000 miles anyway, why should the servicing costs be any more than a 650?

Ducati get reliably 90/100 bhp out of the 750. Cambelts and electrics not withstanding. So 80/85 should be possible from a BB. Maybe!

It comes down to wether you tell them or not really, say for example your in an accident where the police need to be involved and your machine taken . . if you havent told them your not covered, not sure if thats driving without insurance too??

As for servicing, if you need some parts that have changed in the engine and the like your usuall service price shurely would go up, because it would not be the same amount of work to perform if all wasnt fine and dandy in the engine itself.

i got the info about the engine life being cut short by Northwind, but it makes sense that this work would put more stress on to the engine itself causing improper wear.

well thats my 50P on it anyway

[Viney]

Originally Posted by liam_j_harris

im just after the extra grunt, they must be loadsa potential in there. im just trying to find it,

After 8 years dont you think that whatever can be done has been done, tried, tested, blown up, wealded, broken, tywrapped etc etc?

A thou engine in a650 frame has i believe 3 examples. Check out those crazy yanks on SVRider.com