SRAD 600 fuel tank convert to 750 FI

[steverhysjenk...]

Hiya everyone,

I've looked around here and other forums and not found any concise information. I know that a SRAD 600 fuel tank can be converted for use for a 750 FI bike. I know a breather hose needs to be retrofitted to a 600 tank. But I'm struggling to find out what ways this is to be done, I've heard of splitting of the water drain hose (if so where?) or getting a welder out and welding on a new nipple to the tank.

Can someone provide some clear guidance of what the mods are and how they are done would be great.

Thanks

[Pete.]

You don't need a breather - you need a return. With an external pump there has to be a route back to the tank to bleed off excess fuel from the pressure regulator.

Here is how Suzuki do it on th eHayabusa. There's just a U-shaped piece of pipe welded into the tank bottom and pointing back down. There's also a small hole drilled in the underside of the U-bend I guess that's some kind of anti-syphon to stop it pulling air into the system somehow. This setup will let you get to a very low fuel level before th epump cavitates. I would say that a straight-up inlet would do or a 90-bend would be better.

On my bike I just plumbed the return onto the rear wall and let it spray out but I take care not to work the bike hard at low fuel levels because on a turbo it'll melt the pistons if the pump draws air on boost.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[steverhysjenk...]

Hmmmm.... Interesting,

The reason I ask is that I picked up a cheap SRAD with an engine swap to 750. Guy said he fettled with the fuel tank to get it working for FI. The problem I get is that there is sometimes fuel starvation issues. I suspect he has may have add the return hose to the breather nipple.

Point being there is two nipples on the tank backside. One I presuming is the drain and the other is the fuel return. That lets me think whats he done with the breather.

[Pete.]

The two pipes are probably tank breather and a drain to take rain water or over-filled fuel from around the filler cap. You shouldn't use the breather as a fuel return as you're creating a closed circuit and there's no way for air to get into the tank as the fuel is used up. This could be what's causing your fuel starvation.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[steverhysjenk...]

[Pete.]

You just need a return hose barb, as I said in my first reply.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[steverhysjenk...]