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Discussion Starter · #1 ·
Any one done this before? I think I asked, but can't remember. Just wondering. Looking to get a good bit out of the ole SV that I can.
 
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650RR said:
Any one done this before? I think I asked, but can't remember. Just wondering. Looking to get a good bit out of the ole SV that I can.
what you have done so far?porting is not high on priority list as far bang for buck goes.
what hp numbers you looking for?
 

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Discussion Starter · #3 ·
Looking for close to 90, I have a stage 3 jet kit, full yosh exhuast, and hoping to do a 03 cam swap....and figured while i was at it.....
 
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650RR said:
Looking for close to 90, I have a stage 3 jet kit, full yosh exhuast, and hoping to do a 03 cam swap....and figured while i was at it.....
you got long ways before porting is needed.piston kit,flatslides,valve job.....when you done with that you can spend another $500+- for porting.before you do those dont waste your money on porting.
 

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Discussion Starter · #5 ·
Well, considering what I have done, what do I need to do to achieve close to desired horsepower figures?
 
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get cams,buy flatslides,bore it out 2mm,get better exhaust,find good engine builder to put it all together for you and do heads.about $4-5K later you will be close to 90hp.
 

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Discussion Starter · #7 ·
Better exhuast?? I got full RC-3 yoshimura exhuast......what can get better than that? And the flatsides are a type of carberators, right?
 
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650RR said:
Better exhuast?? I got full RC-3 yoshimura exhuast......what can get better than that? And the flatsides are a type of carberators, right?
there are exhausts that will make 3-4hp more than what you got,especialy if you do work on motor.you can sell your and buy another and get 3-4 hp for cheap.yes,flatslides are racing carburators,they are bigger than stock and give you another 4-5 hp.same with cams.this are things that give you most gain for money,after that you getting in to spending money for small gains(like rods cost money but give you no power increase you can feel,but they are necesery with bigger pistons).for power you looking to get you need right combination of parts put together right way.
porting is way down on list of must do to get power.
 
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Northwind said:
Are there any gains to be done with rudimentary head work? Removing burrs, working on the surfaces, that sort of thing... Or are the Sv heads reasonable from the word go?
they are resonable good,actualy ports are prety good.like I said,you dont need to touch them if you not going to far with engine mods.good valve job is worth more.
 

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That makes sense. I spoke to a cylinder head specialist in the UK who said much the same, that most modern jap heads are good from the factory and need a fair bit of effort to improve, but they'd never worked on an SV so I was interested to get a bike specific opinion. I think their exact words were "Leave the heads alone unless you're squeezing ever last HP out, or you've ****ed up the valve seats" :)
 

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Discussion Starter · #12 ·
TWF, can you give me a name and locations of where I might obtain an exhuast and some of these flatsides? I'd appreciate it. And do you know anything about ignition mods? Hey, before i forget, thanks for the advice.
 
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650RR said:
TWF, can you give me a name and locations of where I might obtain an exhuast and some of these flatsides? I'd appreciate it. And do you know anything about ignition mods? Hey, before i forget, thanks for the advice.
you can search internet for both(I recomend Leo Vince for exhaust but they make only 2nd generation full system which needs little mods to fit.we asked if they can run some of 1st generation pipes and waiting on answer).there are a lot of places that will sell you this stuff,including me.
leave ignition alone.
 

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wouldn't a small shot of NOS be the cheapest way to reach 90HP. I know it's not practical on the track, but if you are just shooting for quick HP jumps, NOS really is the easiest and cheapest way to go.

The TL will handle a Dry 40-shot without any mods.
 

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if you are chasing 90 reliable HP --Id give Jhs racing in the UK a yell.
Im racing a curvey 650 and mine was dynod--2 days ago --84hp and 46.4nm of tourque.
my race rules only allow me to run the stock airbox and filter so that got strangled back to 80hp and 46nm.
To get that power is close to a simple case of bolting in parts.
1)M4 full exhaust system
2)stage 2 JHS race cams--no not injected cams--much much better.
3)4 degree advance key
4) Dynojet jet kit
5) quality JHS syupplied air filter.
The cost for all that stuff was around the thousand pound mark -Id guess $2000 usd.
The important thing is its 85 reliable HP --so the bike isn't suddenly a fragile thing.
well worth looking at www.jhsracing.co.uk


flowing the head isnt important at this stage but if you have the heads off I'd possibly raise compression by skimming the barrels by 0.5mm -there is a lot of room in there.
Now another HP gain is to "box up" your airbox and have a ram air system -very trick and a healthy boost in power.
 

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Discussion Starter · #18 ·
frosty said:
if you are chasing 90 reliable HP --Id give Jhs racing in the UK a yell.
Im racing a curvey 650 and mine was dynod--2 days ago --84hp and 46.4nm of tourque.
my race rules only allow me to run the stock airbox and filter so that got strangled back to 80hp and 46nm.
To get that power is close to a simple case of bolting in parts.
1)M4 full exhaust system
2)stage 2 JHS race cams--no not injected cams--much much better.
3)4 degree advance key
4) Dynojet jet kit
5) quality JHS syupplied air filter.
The cost for all that stuff was around the thousand pound mark -Id guess $2000 usd.
The important thing is its 85 reliable HP --so the bike isn't suddenly a fragile thing.
well worth looking at www.jhsracing.co.uk


flowing the head isnt important at this stage but if you have the heads off I'd possibly raise compression by skimming the barrels by 0.5mm -there is a lot of room in there.
Now another HP gain is to "box up" your airbox and have a ram air system -very trick and a healthy boost in power.
Thanks for the info buddy!!! I'll def look into it, but for now, i think I'm just gonna do a 03 cam swap next....wonder what that will cost me in shop time.
 
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