K&N + Race can = Rejet? - SV650.org

26-07-06, 08:41 PM

Ok, my new bike (well new to me, it is a 01 curvy) has a race can and K&N fitted, I have no idea if the bike has been rejetted.

Is it necessary to re-jet if you have made BOTH these mods, or are the SVs overjetted anyway?

This is a trackbike, so I don’t really want to risk it being a bit lean, I don’t really want to have the carbs off to check either … and dyno is hassle and expense.

I am going to presume it has stock jets, if the consensus it that it is ‘safe’ to run the pair with stock jets then I will, if it isn’t then I’ll stick a stock filter in.

TSM · 26-07-06, 08:48 PM

Quote:

Originally Posted by Blue_SV650S

Ok, my new bike (well new to me, it is a 01 curvy) has a race can and K&N fitted, I have no idea if the bike has been rejetted.

Is it necessary to re-jet if you have made BOTH these mods, or are the SVs overjetted anyway?

This is a trackbike, so I don’t really want to risk it being a bit lean, I don’t really want to have the carbs off to check either … and dyno is hassle and expense.

I am going to presume it has stock jets, if the consensus it that it is ‘safe’ to run the pair with stock jets then I will, if it isn’t then I’ll stick a stock filter in.

I would get some bigger jets if you are realy woried. Get it dynoed to see if its ok. I put some DJ150s in my bike, its running rich but i will hopefully have a full system on by next week.

26-07-06, 09:16 PM

I'm running the K&N and a race can, altho my race can is a baffled road legal-ish thing. I still had to fit bigger jets to get it right. I got my bike on a dyno at one of those free days they do and from the curve it was pretty obvious it was lean. I drilled the slides with the bit from the DJ kit and fitted DJ140 jets. The throttle response is much improved and the last time I had it on the machine it was a nice dip free curve.

northwind · 26-07-06, 09:19 PM

If you don't want to rejet, don't fit an aftermarket filter. If you do want to tune for power, don't get a K&N

27-07-06, 09:48 AM

What are the best filters to buy and a 'worthwile' mod for the SV (pointy). BMC... or is it actually worth the trouble, and just leave the original in there?

northwind · 27-07-06, 09:51 AM

For pointy, don't know. K&N pods, I suppose.

27-07-06, 02:17 PM

So that’s a ‘yes you need to rejet if you have them both???’ are the SVs renowned to be a bit sensitive to jetting???

I have plenty of jets at home, but I wanted to avoid taking carbs off if I could. I’d rather put a stock filter in than take the carbs off, that extra ¼ hp it might give if properly jetted is not worth the hassle!!! But I didn’t want to pop a standard filter in if it was jetted for a K&N …

I can see I am going to have to have a look in there ….

Any tips in taking the carbs off??? Done loads of IL4s,but I was presuming being a v-twin it would be a sod?

27-07-06, 02:31 PM

id get it run on the dyno before messing with the carbs otherwise how do you know which way to go with the jetting?. With the right jetting and filter you can see more than 1/4 of a BHP dependant on how far out your bike was to start with which you wont know till you get the fueling checked

So far the pipercross filters seem to be producing some very good results.

northwind · 27-07-06, 03:10 PM

Yep, I'm with SV650Racer. I'm pretty good now at setting the things up by ear, feel, guess and **** but there's no substitute for a sniffer run on a dyno.

It's not so much that they're sensitive to jetting... It's that you're actually making a fairly big change with the swaps. You'd probably be absolutely fine with just the end can, but the filter's specifically designed to effect a big change. A free-flowing filter that doesn't need a rejet isn't very free flowing

THe K&N's marginal.

27-07-06, 03:15 PM

I was being a bit a little facetious with the 1/4hp … but lets face it if it isn’t jetted for it, you will probably loose HP and might even cause harm if it is a long way out!!

Dyno-smyno … that is grief … I’d rather put standard jets in it and run a standard filter and race can (just the can is fine with stock jets isn't it?). I really am not bothered about HP, I just don’t want to run it lean!!

I’d be happy to fit ‘ballpark’ jets. i.e. if someone said I have race can, standard downpipes, a k&n, at have ### jets, then I’d throw a set of them in as that should be ‘safe’.

But I’d even more rather just run a stock filter!

26-07-06, 08:41 PM	#1
Blue_SV650S Guest Posts: n/a	K&N + Race can = Rejet? Ok, my new bike (well new to me, it is a 01 curvy) has a race can and K&N fitted, I have no idea if the bike has been rejetted. Is it necessary to re-jet if you have made BOTH these mods, or are the SVs overjetted anyway? This is a trackbike, so I don’t really want to risk it being a bit lean, I don’t really want to have the carbs off to check either … and dyno is hassle and expense. I am going to presume it has stock jets, if the consensus it that it is ‘safe’ to run the pair with stock jets then I will, if it isn’t then I’ll stick a stock filter in.

26-07-06, 09:19 PM	#4
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	If you don't want to rejet, don't fit an aftermarket filter. If you do want to tune for power, don't get a K&N __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

27-07-06, 09:51 AM	#6
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	For pointy, don't know. K&N pods, I suppose. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

27-07-06, 03:10 PM	#9
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Yep, I'm with SV650Racer. I'm pretty good now at setting the things up by ear, feel, guess and **** but there's no substitute for a sniffer run on a dyno. It's not so much that they're sensitive to jetting... It's that you're actually making a fairly big change with the swaps. You'd probably be absolutely fine with just the end can, but the filter's specifically designed to effect a big change. A free-flowing filter that doesn't need a rejet isn't very free flowing THe K&N's marginal. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

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26-07-06, 09:16 PM	#3
Razor Guest Posts: n/a	I'm running the K&N and a race can, altho my race can is a baffled road legal-ish thing. I still had to fit bigger jets to get it right. I got my bike on a dyno at one of those free days they do and from the curve it was pretty obvious it was lean. I drilled the slides with the bit from the DJ kit and fitted DJ140 jets. The throttle response is much improved and the last time I had it on the machine it was a nice dip free curve.

27-07-06, 09:48 AM	#5
bobit69 Guest Posts: n/a	What are the best filters to buy and a 'worthwile' mod for the SV (pointy). BMC... or is it actually worth the trouble, and just leave the original in there?

27-07-06, 02:17 PM	#7
Blue_SV650S Guest Posts: n/a	So that’s a ‘yes you need to rejet if you have them both???’ are the SVs renowned to be a bit sensitive to jetting??? I have plenty of jets at home, but I wanted to avoid taking carbs off if I could. I’d rather put a stock filter in than take the carbs off, that extra ¼ hp it might give if properly jetted is not worth the hassle!!! But I didn’t want to pop a standard filter in if it was jetted for a K&N … I can see I am going to have to have a look in there …. Any tips in taking the carbs off??? Done loads of IL4s,but I was presuming being a v-twin it would be a sod?

27-07-06, 02:31 PM	#8
SV650Racer Guest Posts: n/a	id get it run on the dyno before messing with the carbs otherwise how do you know which way to go with the jetting?. With the right jetting and filter you can see more than 1/4 of a BHP dependant on how far out your bike was to start with which you wont know till you get the fueling checked So far the pipercross filters seem to be producing some very good results.

27-07-06, 03:15 PM	#10
Blue_SV650S Guest Posts: n/a	I was being a bit a little facetious with the 1/4hp … but lets face it if it isn’t jetted for it, you will probably loose HP and might even cause harm if it is a long way out!! Dyno-smyno … that is grief … I’d rather put standard jets in it and run a standard filter and race can (just the can is fine with stock jets isn't it?). I really am not bothered about HP, I just don’t want to run it lean!! I’d be happy to fit ‘ballpark’ jets. i.e. if someone said I have race can, standard downpipes, a k&n, at have ### jets, then I’d throw a set of them in as that should be ‘safe’. But I’d even more rather just run a stock filter!