[G-Force Junkie]

Why do the carbed sv's have a fuel pump? Is the back of the tank lower than the carbs or something?

[ReaperAZ]

Fuel pump or accelerator pump?

[G-Force Junkie]

Fuel pump, vaccume opperated.

[G-Force Junkie]

??? The EFI ones has an electric pump in the tank, the carbed one have this.

[Northern RR]

Doesn't it have something to do with the fuel switch and a prime position? or am I thinking of another bike?

[CBRVFR]

All models ('99-02) are equipped with a diaphragm-type fuel pump mounted on the right side of the frame. Pressure pulses from the crankcase operate the fuel pump. Fuel from the fuel tank is routed to the fuel pump, which directs fuel to the carburetors. A relief valve inside the pump stops output flow when the fuel level in the float bowl forces the fuel valve to close.

Now, I've got a couple for someone with race or track prep experience...

I just re jetted my SV and I'm putting a full Yosh system on. I'm pretty damned pleased with myself so far, but then I haven't fired it up yet.

1. What kind of high temp gasket stuff should I use to install the exhaust? Do I just slather it on the joints?

2. I removed the breather box that was between the crankcase breather tubes and the air box... so what do you do with the breathers? I figure if I plug them something bad will result, Do I just vent them to the air? Would they present a possible oil leak problem?

3. Where do I get a BMC race filter? I desnorkeled a stock one, but Ivan Performance says to get a BMC.

[G-Force Junkie]

Originally Posted by CBRVFR

Now, I've got a couple for someone with race or track prep experience...

I just re jetted my SV and I'm putting a full Yosh system on. I'm pretty damned pleased with myself so far, but then I haven't fired it up yet.

1. What kind of high temp gasket stuff should I use to install the exhaust? Do I just slather it on the joints?

2. I removed the breather box that was between the crankcase breather tubes and the air box... so what do you do with the breathers? I figure if I plug them something bad will result, Do I just vent them to the air? Would they present a possible oil leak problem?

3. Where do I get a BMC race filter? I desnorkeled a stock one, but Ivan Performance says to get a BMC.

Looking at pictures, I'm more convinced the bottom of the fuel tank is below the rear cylinder carb, hence the necesity of a fuel pump. As for your other questions, the orange hi temp silicone should work fine, I use it on all my 2 stroke pipes. The crankcase breathers need some sort of filter on them to keep stuff out of the motor, K&N makes tiny ones, about as big around as a quarter or so, try one of those. There shouldnt be much coming out of them unless your rings are shot and you have alot of blowby.

[stegen]

With carbs, do they just use gravity to feed them?

[Latebraking]

Originally Posted by stegen

With carbs, do they just use gravity to feed them?

As long as the lowest point of the gas tank is higher than the float bowls of the carbs, gravity will work.

[stegen]

Originally Posted by Latebraking

As long as the lowest point of the gas tank is higher than the float bowls of the carbs, gravity will work.

probably a dumb question but I have NO idea how carbs work

[abtech]

"2. I removed the breather box that was between the crankcase breather tubes and the air box... so what do you do with the breathers? I figure if I plug them something bad will result, Do I just vent them to the air? Would they present a possible oil leak problem? "


Interestingly, you may want to use a real catch can with a filter output for the breather line(s). I found a couple of HP on the RC from unrestricting the crankcase vent and stopped the problem of fuel vapor in the crankcase or oil in the airbox with the stock system. Using a tiny breather can pressurize the crankcase and cavitate the oil (even more than the crank slugs).

[Chain]

Originally Posted by CBRVFR

Now, I've got a couple for someone with race or track prep experience...

I just re jetted my SV and I'm putting a full Yosh system on. I'm pretty damned pleased with myself so far, but then I haven't fired it up yet.

1. What kind of high temp gasket stuff should I use to install the exhaust? Do I just slather it on the joints?

2. I removed the breather box that was between the crankcase breather tubes and the air box... so what do you do with the breathers? I figure if I plug them something bad will result, Do I just vent them to the air? Would they present a possible oil leak problem?

3. Where do I get a BMC race filter? I desnorkeled a stock one, but Ivan Performance says to get a BMC.

I might not be a racer or expert at track prep, but I do have some experience with the SV. I owned a heavily modded (big surprise, no?) '01 SV.

1) You won't need any sealer on any of the joints of your full Yoshi system. I had a full stainless TRS system on mine - it's totally unnecessary.

2) I'm unfamiliar with the "breather box" you're talking about. Is that an evap can? Is your bike a CA spec model?

3) My SV dyno'd better with a slightly more restrictive K&N than the BMC and tank spacing mod you might have read about. I'd get the K&N, but if you must have a BMC, I think Dennis Kirk and AF1 Racing both carry them.

A question: did you do Catpoopman's jetting on your bike or did you buy a quality, engineered jet kit?

[Tornado bait]

Originally Posted by stegen

probably a dumb question but I have NO idea how carbs work

Have you ever blown air accross the top of a straw in your drink and watched the liquid rise in the straw? Keep doing it until the liquid comes to the top. Your drink cup is like the float bowl and the straw is like the open jets in the carb.

[CBRVFR]

Originally Posted by Chain

2) I'm unfamiliar with the "breather box" you're talking about. Is that an evap can? Is your bike a CA spec model?

3) My SV dyno'd better with a slightly more restrictive K&N than the BMC and tank spacing mod you might have read about. I'd get the K&N, but if you must have a BMC, I think Dennis Kirk and AF1 Racing both carry them.

A question: did you do Catpoopman's jetting on your bike or did you buy a quality, engineered jet kit?

Thanks for the heads up on the high temp goop, Chain.


The "breather box", according to the manual, is the sort of trapezoidal appendage to the left and below the air box, into which the two crankcase tubes vent. Then the oil and schmutz goes right into the bottom of the air box.

Abtech - Do I make this catch can or is there one I can buy? What do I use for a filter material??

I bought the Ivan's Performance Race jet and needle kit.. with the same Yosh system I have and the aforementioned BMC it's supposed to raise HP and torque by about 10%. Ivan says the K&N has to be modified ( desnorkeled ) which I thought was a pain in the ass when I did it to the stock filter, but the BMC is ready to rock.

I'll try those sources you mentioned ( actually, I'll check our sponsors first. ) Thanks!

[abtech]

Originally Posted by CBRVFR

Thanks for the heads up on the high temp goop, Chain.


The "breather box", according to the manual, is the sort of trapezoidal appendage to the left and below the air box, into which the two crankcase tubes vent. Then the oil and schmutz goes right into the bottom of the air box.

Abtech - Do I make this catch can or is there one I can buy? What do I use for a filter material??

I bought the Ivan's Performance Race jet and needle kit.. with the same Yosh system I have and the aforementioned BMC it's supposed to raise HP and torque by about 10%. Ivan says the K&N has to be modified ( desnorkeled ) which I thought was a pain in the ass when I did it to the stock filter, but the BMC is ready to rock.

I'll try those sources you mentioned ( actually, I'll check our sponsors first. ) Thanks!

I used the 5115 from here which is probably overkill, but it mounted up very nicely and I used the braided line to go to the crankcase vent on the front valve cover on the RC.

[CBRVFR]

Originally Posted by abtech

I used the 5115 from here which is probably overkill, but it mounted up very nicely and I used the braided line to go to the crankcase vent on the front valve cover on the RC.

Thanks - That's a beautiful piece.

I'll put away the beer can and the cotton balls now...

[Chain]

Originally Posted by CBRVFR

Thanks for the heads up on the high temp goop, Chain.


The "breather box", according to the manual, is the sort of trapezoidal appendage to the left and below the air box, into which the two crankcase tubes vent. Then the oil and schmutz goes right into the bottom of the air box.

Abtech - Do I make this catch can or is there one I can buy? What do I use for a filter material??

I bought the Ivan's Performance Race jet and needle kit.. with the same Yosh system I have and the aforementioned BMC it's supposed to raise HP and torque by about 10%. Ivan says the K&N has to be modified ( desnorkeled ) which I thought was a pain in the ass when I did it to the stock filter, but the BMC is ready to rock.

I'll try those sources you mentioned ( actually, I'll check our sponsors first. ) Thanks!

Ivan is a deity. I'd follow his advice. I put his jet kit in my Fizzer and it flat stomped.

[Latebraking]

Originally Posted by stegen

probably a dumb question but I have NO idea how carbs work

Have you ever siphoned fuel from a car's gas tank? As long as the receving container is lower than the fuel level in the car's gas tank, fuel will flow. Same thing with getting fuel into the float bowls of a carb.

[Chain]

Kevin Cameron's Sportbike Performance Handbook is a good resource for learning about how your machine works including a detailed chapter on fuel systems.

[WetShrub]

Talk to Zoran. He knows everything there is to know about SV's...

http://www.twinworksfactory.com/

You can also find him on BARF or on svrider.com, his screen name is TWF

-Shrub

[HRC NICK 11]

If you can get a vacume on the crank vent it will make some power.

Think PCV vent.