Pointy model differences ?

[rs2fifty]

Hi everyone
Im new to forum and on the lookout for a pointy SV and was wondering if there were any changes engine wise throughout this model range?
Im a big tinkerer and know i will unfortunately end up throwing money at it and wanted to know if there was a better model to go for if i want to modify.
Cheers

[Bibio]

curvy = carbs.

pointy = TB's. K7> get twin spark.

pointy = not much you can do part from mess with map in brains and big bores.

curvy you can tinker with cams, carbs and also big bores.

[rs2fifty]

Thanks Bibio, i was only intending to replace exhaust and add power commander to the motor and spend most of my time on the handling. Is the twin spark any better than the single?
Cheers

[monkey]

I believe it's more for emmisions; to make sure more fuel is burnt and not spat out the back.

[mikerj]

curvy = carbs.

pointy = TB's. K7> get twin spark.

pointy = not much you can do part from mess with map in brains and big bores.

curvy you can tinker with cams, carbs and also big bores.

Why can't you change the cams on a pointy?

[jambo]

Why can't you change the cams on a pointy?

You can, it's just that mostly people put pointy cams in curvy engines. The pointy engines already come with pointy cams. There are still further gains to be made using inlet cams on the exhaust side, but they're just not as great.

Personally I'd start with the bike that's in a good condition and not fuss too much about the year. From K3+ there's been nothing that would be considered a performance gain, just additional emissions systems added.

Jambo

[rs2fifty]

Thanks Guys

[squirrel_hunter]

Why can't you change the cams on a pointy?

You can.

There is some discussion over here (http://forums.sv650.org/showthread.php?t=163504) if you'd like to know more...

[Bibio]

twin spark is a bit of a controversial topic some say for, some say against but as monkey stated it burns more of the fuel so it must be better right! well sort of. gasses are ignited in two different places so you get a messy combustion but more fuel burnt. single gives a better combustion but lees fuel burnt. both are dictated by how well the cylinder head is designed and compression ratio, air to fuel so on and so on. it's a lot more complicated than the answer i gave and i don't admit to knowing much if anything technical about it. carbs are smoother and easier to tinker with to get a better burn with less emission bolt ons to go wrong.

power commander is a waste of money as far as i'm concerned on a 650 v twin as the gains if any are not worth the wonga. better to have the OEM brains mapped instead. same goes for K&N filters and such like. if you plan on keeping the bike for 30k+ then its a good investment but don't look at it as a 'performance' item. same goes for fancy plugs.

spend the cash on the suspension and brakes which in turn will let you go faster. the SV in both guises are a peach of a bike once given good bouncy bits.

[mikerj]

twin spark is a bit of a controversial topic some say for, some say against but as monkey stated it burns more of the fuel so it must be better right! well sort of. gasses are ignited in two different places so you get a messy combustion but more fuel burnt.

Why would the combustion be any more messy? Combustion is a very chaotic event (http://www.youtube.com/watch?v=sEf8va1S7Sw&playnext=1&list=PL6ACB49FCCE072FB2&feature=results_main) anyhow.

The quicker you get the mixture burnt, the more energy you extract, so twin plugs are most always an advantage on larger capacity cylinders. Try driving an Alfa twin spark with a failed ignitor; the difference in power is very noticeable. The big problem is getting a second plug to fit in a useful position within a 4v head is very difficult.

[Bibio]

as i stated it depends on the design and alfa have been at it for years and know what they are doing. suzuki on the other hand came along and put the other plug anywhere they could get it to go and left the original in the centre all to meet emissions. i also said i'm no expert :-) are you?

[phil24_7]

power commander is a waste of money as far as i'm concerned on a 650 v twin as the gains if any are not worth the wonga. better to have the OEM brains mapped instead. same goes for K&N filters and such like. if you plan on keeping the bike for 30k+ then its a good investment but don't look at it as a 'performance' item. same goes for fancy plugs.

spend the cash on the suspension and brakes which in turn will let you go faster. the SV in both guises are a peach of a bike once given good bouncy bits.

What Bibio says. I have a power commander and paid for a custom tune but wouldn't do it again to another SV. The performance gain wasn't massive although power delivery has improved a great deal. You can get similar results from a Yoshi (ECU) tune and for a fraction of the price.

The suspension can be upgraded massively by either fitting gixer stuff. This is what I have done and it is single handedly the best mod I have done. This can be improved on even further by fitting aftermarket suspension but performance to cost ratio over gixer stuff is a little harder to swallow!

[rs2fifty]

Thanks Guys