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YZF600R street fighter- loss of power - air intake HELP!?

ryanisgone

ryanisgone

...a registered user...
Joined
Apr 14, 2006
Location
Modesto
Moto(s)
2007 Triumph S3, 2001 YZF600R, 2007 ZX10R,
2011 K13S
Hello Guru's,

I am in the process of turning my 2001 600R into an ugly as hell street fighter. I have taken off the front cowling, air intake resevoir tank things, front frame, gauges, and now I have the two large tubes sticking out of the frame on the left and right side and a mystery smaller tube (about 1/2 inch diameter) coming out of the middle of the frame.

And guess what. Low end RPMs are fine, mid to high range is gone. By gone I mean the bike feels like it is choking, running out of gas, dying, but it is solved when I shift and drop RPM's.

What do I need to do to get that mid to high range back? Right now it is unpredicatable to ride because I get into turns and roll on the throttle and I lose power...not good.

Any ideas? Thank you guys and gals ahead of time.

-Ryan
 
couple options. im still debating to do this myself...


1. switch to NON TPS carbs. i think pre 1997 carbs will work.

2. leaving the two big tubes on and using a small funnel on the third smaller one, believed to help get air into the motor

3. figure something else out thatll work

keep me posted on what u do, id like to know my options
 
Regarding the third smaller tube, I was going to cap it, or cap it but leave a small hole because when I took the front frame and cowling off there was a small maze of tubes and conduits and the small tube ran to a T-junction connectied via tubes to the left and right resevoir tanks on each side. As far as the large tubes, I was going to leave them open until i get around to lifting the tank, taking the tubes out, and replacing the air filter.

Someone at Scuderia did something similar to an older R1 and it looks nice and pretty in an ugly way. I see it parked there often. I might buzz by there and see what I can figure out. The bike is usually cared for by Werkstatt, and I will be going there soon as well to ask Daniel about it.

I will try to get pics up this evening, tomorrow.

But as for now, I have to look forward to a creepy, ass puckering ride home at midnight.
 
the smaller tube pressurizes the float bowls & diaphram caps. to fix the problem make it so the tube that comes off the carbs that pressurize the flaots/diaphrams plugs into the airbox directly, after the filter. this way the floats/diaphrams always have the same pressure as the airbox.

part # 31 needs to plug into the airbox, somehow. http://fiche.ronayers.com/Index.cfm...130/Model/YZF600R/GroupID/247426/Group/INTAKE
 
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Yeah, I can see the point in keeping the air box assembly, but the ram system is kind of ugly in a massive amount of tubes kind of way.

Any ideas on how to rig the tube into the airbox. Or is it basically, drill hole, insert tube, seal tube to air box.
 
Wait a sec, does that third tube (part #31) basically wind its way to the two main tubes via the resevoirs, or is it the purpose of the resevoirs to have a constant pressure inline with the two main tubes?

Could I take the large two tubes off and run a tube from the carbs to the holes in the air box where the large tubes used to be?
 
ryanisgone said:
Wait a sec, does that third tube (part #31) basically wind its way to the two main tubes via the resevoirs, or is it the purpose of the resevoirs to have a constant pressure inline with the two main tubes?

Could I take the large two tubes off and run a tube from the carbs to the holes in the air box where the large tubes used to be?
Click to expand...
you'll need to mod the airbox so #31 gets pressure right from the airbox and not the front of the bikes. don't route #31 to where the other 2 larger tubes are. you could also remove the 2 larger tubes and a little of the top-end will come back, but the real fix is to make sure the float/diaphrams have the same pressure as the airbox.
 
Just to make sure, I will plug #31 into the top of the air box - the part of the air box that comes after the filter and then into the engine.

Right?

It shouldn't be that hard....or will it...
 
the top is after the filter :thumbup, though i'd try removing the 2 big tubes 1st and leave 31 open to the atomsphere and see how it does, then decide if you want to mod the airbox, as theres no going back after you start drilling/cutting/etc...
 
elskipador said:
the top is after the filter :thumbup, though i'd try removing the 2 big tubes 1st and leave 31 open to the atomsphere and see how it does, then decide if you want to mod the airbox, as theres no going back after you start drilling/cutting/etc...
Click to expand...

ive seen that done, and the person used a small funnel and put it into the small tube (31) so it could get better air flow...

it was posted on yzf600r.com but im having trouble finding it
 
Thanks guys, I will work on it in the next few days and let you know how it goes. Chris, if you find that funnel thing info, let me know.
-R.
 
Like some others have mentioned, you want to pressurize the float bowls, etc. at the same pressure as what the carb sees at its throat. So, you want to hook that small hose up to the airbox that's actually feeding the air into the carb throats. Anywhere else will not do. That means on the down flow side of the filter (after the air has gone through the filter).

Good luck.

And, it's possible you may still have to make some jetting changes. I highly recommend a dyno run be made to confirm jetting after you've made the necessary plumbing corrections.
 
ST Guy said:
Anywhere else will not do.
Click to expand...
thats not exactly true. the OP removed a bunch of hosing from the front of the bike, these little hoses had small funnels on them, without these little funnels on the float pressurization tubes the system doesn't work right. theres 3 thing the OP can do. 1.) ad a little funnel to the tub and leave it @ the front of the bike. 2.) hook the hose to the airbox. 3.) remove the little hose and the 2 larger scoops and run the bike as non-ram-air.
 
interesting interesting.
i like the re-route idea while keeping the ram air, routing the hose after the filter, and seeing what it gets me. if everything goes ape shit i can always plug a hole. running the bike as a non air ram seems to me like trying to out engineer the engineers who devloped the system.
 
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