View Full Version : flatslide carbs
mickeymac
12-01-09, 09:05 PM
happy new year to everyone !!! hi guys im looking to buy fcr carbs for my sv anyone know a good place to buy these s cheers
yorkie_chris
12-01-09, 11:39 PM
Ker-CHING! :-P
Try allensperformance.co.uk
Dangerous Dave
13-01-09, 06:00 PM
Ker-CHING! :-P
Well said.... a lot of money for what they actually offer.
The SV has great carbs to be honest, I still run with the OEM carbs.
mickeymac
13-01-09, 10:40 PM
ya thanks guys ive been kinda saving for them and doing loads of over time at work so its my treat to myself heard i should get between 4 to 5 bhp do you guys think that sounds about right
northwind
14-01-09, 01:02 AM
Depends on setup and other components. You also lose the choke, and the easy drivability of the stock carbs- flatslides dump fuel as fast as you turn the throttle, so you can bog down something rotten if you're not always just right. Are you a throttle chaser? (ie, do you ever open the throttle then wait for the revs to catch up?) Can't really do that with flatslides.
Robw#70
14-01-09, 01:37 AM
I gained 6hp from about 4K, would be horrid on the road and not really a benefit, but on track theyre great, the bike will virtually accelerate as fast as you can open the throttle (tuned motor).
If you get them from Allens they're about £750+ vat, JHS would be a bit cheaper but take longer Or order them direct from the US from someone like SVraceshop, a friend of mine got his for about £530 when the exchange was good
mickeymac
14-01-09, 06:08 AM
thanks guys i knew the story with the cracking opening of the throttle and bogging down ,but the way i look at that its just like a correcting tool to get my timing smother and applying the throttle more evenly smother = faster ,i have done the cam swap from pointy to curvy and have a full akropovic system on it and it is used for racing
MattCollins
14-01-09, 10:38 AM
Have you considered FI? The bits are likely to be cheap and there are some good inexpensive controllers around.
Cheers
yorkie_chris
14-01-09, 12:27 PM
Also you can bore out the pointy throttle bodies for a bit more poke.
mickeymac
14-01-09, 12:40 PM
what is the FI...........
yorkie_chris
14-01-09, 12:43 PM
Injection
Robw#70
14-01-09, 09:41 PM
Unless you fit 1000 throttle bodies you'll get more power from the flatslides and to fit the bigger bodies and convert to injection is quiet involved.
The main restriction on an injected bike is the throttle bodies, even the std cv's can flow more as they are tapered, wheras the throttle bodies are parallel.
As for bogging, if theyre setup right you've got to be really brutal to make an sv bog, 4cyl bikes are more prone to it with fcr's fitted, but in 2 years racing mine it never did it.
northwind
14-01-09, 10:10 PM
Ah, my mistake, I've only ridden old GSXRs with flatslides but I'd heard it was the same on the SV.
Unless you fit 1000 throttle bodies you'll get more power from the flatslides and to fit the bigger bodies and convert to injection is quiet involved.
The main restriction on an injected bike is the throttle bodies, even the std cv's can flow more as they are tapered, wheras the throttle bodies are parallel.
As for bogging, if theyre setup right you've got to be really brutal to make an sv bog, 4cyl bikes are more prone to it with fcr's fitted, but in 2 years racing mine it never did it.
actually there is no much difference at all between bored out tb's and huge ones like sv1k.
bored out ones are worth 4hp.about same as flatslides except flats do have better gain all the way through rpm range.
and stock tb's are tapered through bore,not parallel.
pencil shavings
15-01-09, 01:24 AM
actually there is no much difference at all between bored out tb's and huge ones like sv1k.
bored out ones are worth 4hp.about same as flatslides except flats do have better gain all the way through rpm range.
and stock tb's are tapered through bore,not parallel.
Im always amazed at the knowledge here :cool:
yorkie_chris
15-01-09, 01:31 AM
You forget, several people in this chat do this for a living. Some might even run SV race teams/race bikes.
pencil shavings
15-01-09, 11:34 AM
true...
but you can do a job and still be bad at it ;)
anyway, im just glad im here where there are people who know and they like to help. Keep up the good work! :mrgreen:
Why bother dicking about with flatslide carbs when you could just get a better bike?
yorkie_chris
15-01-09, 12:00 PM
$hits and giggles, it's not all about going out and buying a missile.
mickeymac
15-01-09, 06:47 PM
well i can understand each of everyones points ,but to tell the truth im kinda swaying away from the idea of buying flatslides , if i understand what i am been advised to do is to fit sv 1000 throttle bodies that would near enough give me the same gains yes i would go for that ,then i presume i would have to re-jet the bike i am not a mechanic but i do listen to good advise and appreciate and experiance from others who are kind enough to share
yorkie_chris
15-01-09, 07:10 PM
What year SV? Look at zadars advice; the massive TB's from the SVthou don't give much advantage over boring out the stock ones.
If your bike is not already an injected model then there is no point, the conversion to EFI is a major pain in the rse.
Unless you fit 1000 throttle bodies you'll get more power from the flatslides and to fit the bigger bodies and convert to injection is quiet involved.
The main restriction on an injected bike is the throttle bodies, even the std cv's can flow more as they are tapered, wheras the throttle bodies are parallel.
As for bogging, if theyre setup right you've got to be really brutal to make an sv bog, 4cyl bikes are more prone to it with fcr's fitted, but in 2 years racing mine it never did it.
considering that most flatsides that people will install are pumpers, as you said, have to be very very brutal with 1/5 insert to cause an issue
mickeymac
15-01-09, 08:15 PM
its a curvy 01 carb model
yorkie_chris
15-01-09, 08:16 PM
Then fitting EFI would be a major pain in the ars. Flatslides are pricey, some hot cams would probably be better bang for the buck. What other mods have you done to it?
mickeymac
15-01-09, 09:03 PM
full akropovic system ,gen 2 cam swap, elka back shock,upgraded front springs, wavy discs ,gsxr 1000 calipers,
TOLAROS
15-01-09, 10:48 PM
full akropovic system ,gen 2 cam swap, elka back shock,upgraded front springs, wavy discs ,gsxr 1000 calipers,
You mean Galfer wavy discs?If yes where did you buy them from?
Have a look here:
http://forums.sv650.org/showthread.php?t=123591
Any reliable UK galfer dealer?
Why not go for a 700cc bore kit and get far more bang for your buck across the board.
yorkie_chris
16-01-09, 01:52 AM
wavy discs are just about a tenner for every wave of your money on them that does f##k all.
700cc ... aye but go for cp pistons not wiseco... the wiseco weigh a tonne.
Why not go for a 700cc bore kit and get far more bang for your buck across the board.
personally I would never do 700 kit,especially not if I don't have flats already :)
getting all the power it can be have without opening motor is my order.
motor internals are last on list.
yorkie_chris
16-01-09, 12:12 PM
Hehe... does anyone know how much a set would be in the UK?
they are $1k here.I have seen them on ebay for less.
Robw#70
16-01-09, 07:12 PM
actually there is no much difference at all between bored out tb's and huge ones like sv1k.
bored out ones are worth 4hp.about same as flatslides except flats do have better gain all the way through rpm range.
and stock tb's are tapered through bore,not parallel.
Theyre not massively tapered, I meant using TLS/R tb's, ive not played with SV thou stuff.
Through Allens (uk distributer) 41mm FCR's are £750 +vat, But the good thing with them is they always have a value so you dont loose much on them, esp in the uk, take a look on ebay even worn out oe zx7 ones fetch decent ££
Mickeymac, What class are you racing in?
I have used sv1k tb's on sv.
mickeymac
16-01-09, 08:09 PM
650 super twins ireland theres no limits what you can do as long as you do not go over 650cc bore ,would just like to hear peoples opinions on what s best with common sence to get the best out of my bike without having to spend stupid money i have dropped the flatslide idea some times simple ideas work better and thats what i would like to hear thanks lads....
yorkie_chris
16-01-09, 08:27 PM
Dangerous Dave has about 110bhp out of his motor on stock carbs but that is bored and stroked.
Big valve head might work better if you are sticking to 650cc
TOLAROS
16-01-09, 09:39 PM
Dangerous Dave has about 110bhp out of his motor on stock carbs but that is bored and stroked.
Big valve head might work better if you are sticking to 650cc
:o:o:o
110?????What is the capacity of his motor now?
110.....OMG
yorkie_chris
17-01-09, 04:39 AM
800cc, big valve head, cams (look at daves sig, I can't be arsed giving you shopping list!)
TOLAROS
17-01-09, 07:43 PM
800cc, big valve head, cams (look at daves sig, I can't be arsed giving you shopping list!)
I just did...
HOLYSHIFT!!!!
The bike rocks!!!
yorkie_chris
17-01-09, 07:47 PM
Oh yeah bear in mind on the website of JHS racing, the price of the billet barrels you need to do an 800cc motor is listed as £ask, and described as "not cheap". From JHS that will be the understatement of the fackin century!
Billet crank, rods £1500. At least £600 in the heads. £550 on the exhaust.
Not a cheap motor.
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