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Old 25-10-07, 07:51 PM   #11
yorkie_chris
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Default Re: Re-Jetting SV650S

Ive got the fuel one as well, theres a bit of a flatspot at 5krpm, and it hangs up on idle, so needs richening up slightly.

However its still rideable, and hasn't eaten any valves, yet.

However this might not apply to you, as I'm on 33bhp, which royally screws the carburetion over as it never really gets to the mains.
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Old 25-10-07, 08:00 PM   #12
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Default Re: Re-Jetting SV650S

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Originally Posted by Zuki_soldier View Post
Just a quick question guys
Ive just fitted my new fuel slip on can with removable baffle

Is it a good idea to get the carbs set up if i intend to use the exhaust without the baffle quite a bit?
Cheers
Ian
This would depend on the effects of the decreased back pressure (leaning it out). Contact fuel and see what they recommend.

What spanner man said still stands, the fewer the mods the longer the life expectency especially in 2 strokes, ouch I know the feeling.

Shouldn't be drastic with a can though.
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Old 25-10-07, 08:07 PM   #13
yorkie_chris
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Default Re: Re-Jetting SV650S

The fuel like most slipons is supposed to run fine with no change to setup.
Dunno why mine is different as I've not heard any other problems with them
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Old 28-04-18, 07:11 PM   #14
Graveyard8516
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Default Re: Re-Jetting SV650S

I have a blue flame exhaust and I get a flat spot around 5000rpm. What does this mean? What do I need to do to rectify this?


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Old 29-04-18, 10:36 AM   #15
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Default Re: Re-Jetting SV650S

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Originally Posted by northwind View Post
I'd disagree, the difference in power when I fitted my race system was unmissable. I totally misinterpreted it, instead of feeling the loss of power in the midrange, I actually thought I'd gained power up top, making the midrange feel weak. Complete rubbish as it turns out, I was down on power everywhere and down about 6bhp at 5000rpm! But the brain reads contrasts not absolutes, so a gradual power curve usually feels weaker than a steep one, even when it's not.

Still, I have to ask, why would you fit an expensive race system and not rejet for it? A slipon would give you almost the same weight loss, be far cheaper, and wouldn't have any risk of sabotaging your power.

It's possible for a lean-running bike to suffer damage over time by the way... It'll also be running inefficiently, if it's lean enough, causing a loss of MPG.

The sensible thing to do with an SV is to leave it alone, frankly, a full system and rejet will net you, being optimistic, maybe 5-7bhp at best, depending on what filter you use, in return for several hundred pounds worth f parts and work. It doesn't make much sense. I did it myself with a £150 exhaust system, and a used BMC Race RS filter and DJ jet kit, total parts cost £220. Then I taught myself how to jet it, and did it, total cost 2 dyno runs, £30, to check my results, but a lot of my time. And even then it's hard to justify.

If you want a little more power, consider the cam swap instead, it's quicker, it's just as effective and it's much cheaper. If you want a LOT more power, either get a faster bike or start saving
"don't waste your money for small gains"

"do a cam swap"

Make yer mind up, mate 😂
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