Just got off Phone with Aaron Excell. Obviously those of us who bent the support did this on our own. It was not in the instructions. The airhorn does not bend it enough to matter since it still contacts the divider. Dont bend it more. Bend it back or just remove the divider. The dyno says it has little effect on power. I will try running without the divider.
I did some welding using screwdriver and heating it up with torch. Worked well. Plan is to do same all the way around that divider in spots. To stop the reed effect. Would be cool to see what is going on in airbox with a high speed camera. I did order a new box and divider but will use this one for testing.
yamaha06
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Did Aaron say removing the divider would have a slight negative effect on power? I never did get a chance to look at mine yet, the sleds off to the dealership. I will check it out when I get it back and post how mine looks.
He said they saw little to no effect and said other Yamahas do not have a divider between oil vents and bottom when asked. I fixed it so am running it this weekend but will weld the thing in there once done testing some other mods I am doing.
Okay guys this is crazy. Broke that weld and wear on all contact points is extreme. This is two weekends of riding and looks like 10 years of wear. I am going to remove that divider. Cant chance it going through my motor. Others have checked theirs and no wear at all. Even modded boxes. I made dang sure to have all the screws tight. Still more wear. I dont know why mine seems to be only one doing this.
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It almost looks to me like the combination of the bent divider plus the large hole cut for the Excel inlet are combining to create this issue. Is the crack visible from outside the box while installed?
I just took mine out and took it apart. I did not see any cracking at all but I don't have the Excell setup just the bent divider.
I just took mine out and took it apart. I did not see any cracking at all but I don't have the Excell setup just the bent divider.
scott32
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A good 2 part expoxy will weld all of that right back up. Couple, 2 0r so years back I busted both tabs on my headlight assembly on the apex during a really fun roll-over. Sand and weld, and has held up very well. It has gently rolled it since, and it has held. Looks as though your screwdriver weld has created a rough enough bonding surface. If it works well without the divider, then so be it, but the epoxy I used can come in a variety of colors and if done right looks stock and untouched.
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Are you sure this broken divider isn't self inflicted? You bent it when putting the cone in? I have not heard of anyone else having the issue. Mine is perfect...the cone just touches the divider. There is no way this has enough force to make this happen...just my observation.
Positive not self inflicted. The support is the only thing bent when putting horn in. The piece that is broken is the big divider that covers whole bottom of box.
Like I said before this has to be caused by rapid vibration of that divider. The support is what is supposed to stop that vibration. I fully expect any who have bent that support for better airflow to have the same issue. Just watch for it.
TJ-R
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I pulled my airbox to do the Stingray mod and after inspecting it I'd offer that, IMO, the purpose of the divider to to deflect any oil spillage away from the adjacent intake and allow it to drip/run down into the small sump and out the hole. It also would serve to creates a longer path for hot gasses emitting from the crankcase to travel and thus allow them to cool.
As for the opening and increasing flow, here are some numbers I came up with.
As for the opening and increasing flow, here are some numbers I came up with.
- The bore of the throttle body intakes is 45mm each and the stock intake horns have a similar ID. The three rectangular air box intake openings are 25mm x 52mm.
- The surface area of the three 45mm ID carb intakes is 4,767 sq mm and the airbox intake holes are 3,600 sq mm.
- Therefore the airbox opening is 25% smaller.
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Did you just admit that you bent the divider? Then I would say it is self inflicted.
No I bent the support. Admitted that on first page. That is the concern here. Many others have done same thing.
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So you're warning to the other guys that if you bend it it could crack and break. Some others are reading it that if you do the Excell mod that that is causing it to break and that is not true because I did not break mine. You are getting different modifications combined.
I am warning people that if the SUPPORT is not in original position then the DIVIDER may crack. Support needs to be in the two protrusions on the divider to operate as intended. Or ditch the divider. That is what Excell told me to do. I am ditching the divider and if I am not happy with results I will install a new divider and bend back the support to fit the protrusions I have already cut a flat on that airhorn so it will fit without interfering with the support. I do not know why the divider cracked but based on the amount of wear I believe it to be from fluttering like a reed in a duck call. Bending the support enough that it wont fit in the protrusions on divider is defeating the purpose of the support and will cause this issue in my opinion. Here is some pics showing the components.
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