Rejetting and air filters - advice needed

[Pricey12]

I've done some searching on the above but am still at a bit of a loss :confused:

I've got a Delkavic stubby fitted to my bike along with stock air filter and stock (as far as I know) carb setup. I know a lot of people say that you don't always have to re-jet with a slip on, but I don't really want the bike to potentially be running lean long term. Is a Dynojet kit the best option?

I'm also after some more induction noise (I previously had a Ducati Monster with an open airbox and performance filter and the induction roar was adictive :D). I've read up on aftermarket air filters for the SV and most people say stick with stock, but this obviously won't give me the sound I'm after. I also can't seem to find an open air box setup for an SV anywhere :confused: I've also seen tank risers, but I don't think they would do much with a standard setup.

So, basically I'm looking for a setup that will eliminate any potential fueling issues and give me a nice induction roar without costing a fortune. Any suggestions guys?

Thanks

[Pricey12]

Ok, so I've ordered some tank risers (because I'm too lazy to use washers) and am going to look at maybe removing the sound deadening foam from the underside of the fuel tank. May give me a little bit more induction noise I hope. Will this cause lean running with the stock filter? :confused:

[johnnyrod]

The foam is there to stop the tank vibrating, best to check it's on properly but otherwise leave it be. The early K&N filters were worse than stock but this is rectified now. Any good aftermarket one will do though - K&N, BMC etc. Yes it'll definitely run lean, moreso at the top end. A dynojet kit isn't a band-aid, it's a set of bits to help the dyno tuner find the optimum settings, so you still need dyno set-up to find out what suits yours. A new air filter will be louder, don't worry about that!

[Pricey12]

Thanks. Just been doing some more research and it looks like JHS Racing do a modified stage 2 Dynojet Kit and BMC filter for around £150. Not cheap, but may be a decent option.

[Pricey12]

Or maybe not...
Response from JHS:
"We no longer manufacture the stage 2 kit for the sv650 as this was some time ago that we where using the carbed model machine.
We can supply a jet kit and air filter for your machine to very much the same spec as we do have lots of spare parts stock we can call upon.
The cost of the kit including fitting and set up will be £499.00inc vat"

I'm just looking at getting my fuelling set up correctly and a nice sounding air filter. Obviously an extra pony or two is a nice bonus, but I think that price is a bit excessive.

Search goes on I think... :rolleyes:

[johnnyrod]

First off if you're looking for dyno set-up then you can't worry about the depth of your pockets. You can find the cost of dynojet kits on-line, and on the Dynojet site you can find a local dyno centre to speak to about set-up costs, they'll sell you the filter and kit anyway I would expect. Yes you'll get some more power but also snappier throttle response and all the lumps smoothed out of the carburetion. If you go on to do any other mods then it's also the basis as you have a free-er breathing engine (e.g. pointy cam swap which for the price you really really should).

[Pricey12]

Have found a place not far from where I work with a dyno. They specialise in Harleys and Triumphs,but will a chat with them. Just seems like a lot of money considering the parts involved. Still, the cost is in the set up as you say. I have thought about a cam swap further down the line, but for now just want to get the bike set up properly with a freer flowing filter. It's frustrating though, because if you know what jets etc, you need they are pretty inexpensive to buy individually. I doubt and Dyno centre will tell me this though when they have such a huge markup on the kits :rolleyes:

Just out of interest, if I were to buy a kit / jets and filter online, could they be fitted by a garage without using a dyno, or would that just be guess work?

[johnnyrod]

A sI said the kit isn't a single set of bits, it has quite a lot of stuff in it, for example three or four sets of main jets, plus other bits like shrouds that go at the top of the emulsion tubes, whihc may or may not be needed. What you're paying for in the kit is the development time by Dynojet to save you money in dyno operator's time. With FI it's a lot less work intensive than carbs so thats where your money goes on dyno time as it's basically educated trial and error. So yes you could buy a kit and fits some of it and cross your fingers, but I think you can guess what the answer to that is. If you go somewhere that has done SVs before they should have a head start. Some people have their reservations about JHS but James has tuned a lot of SVs so maybe worth a shout.

On a positive note, the cam swap is stupidly easy and you won't need a second lot of dyno time, it seems to magically just work with the same settings as the stock cams.

[dirtydog]

On my 1st sv I had a k&n filter which I'd "desnorkeled" ;-) and a full akrapovic race system so decided a dynojet stage 1 kit would be the best way to go.
I found a local dyno place (they actually specialised in aprillia tuning) to do the work. They fitted the kit and set it all up on the dyno.
The cost was about £300 but that was about 10 years ago, its certainly not a quick and cheap way to go!

[NTECUK]

this ok
http://www.google.co.uk/url?sa=t&source=web&cd=1&ved=0CDAQFjAA&url=http%3A%2F%2Fmickk.net%2Fmotorcycle%2Fdocument s%2FRejetting_Notes.pdf&ei=h4deUfTcBOWM4gSLx4C4Cw&usg=AFQjCNFzuQTLA6aaxx-avEgjYPMnGpuAMA&sig2=eFkfNqLpMJVYj8YDmQHjxw

[Pricey12]

this ok
http://www.google.co.uk/url?sa=t&source=web&cd=1&ved=0CDAQFjAA&url=http%3A%2F%2Fmickk.net%2Fmotorcycle%2Fdocument s%2FRejetting_Notes.pdf&ei=h4deUfTcBOWM4gSLx4C4Cw&usg=AFQjCNFzuQTLA6aaxx-avEgjYPMnGpuAMA&sig2=eFkfNqLpMJVYj8YDmQHjxw

Bit of light reading for my lunch break I think :p

[johnnyrod]

A bit Heath Robinson for the 21st century to be honest. With SV carbs you don't know where the slide is really, and everything happenees very quickly, so the definitive data from a dyno is actually reallly useful. Back in the day of slide carbs you could just ride it and see. Before someone shoots me down, yes this is a simplification, but really if you know nothing then you're best finding someone who does than fannying around for ages and stil not getting it right.

[NTECUK]

On the zx6-F3 when I put the Leo Vince on it just Raising the needles 2 notches And open the idle mix quater turn was good enough to get a flat spot out .
I did one plug chop but its such a pita I'm not rushing to see if its too rich.
uses less motion lotion the the RSV anyway.