Soo..don't 2 strokes gulp air from the air box?

The volume of the air box relates to how much gulp it can get.

Your gulp is being restricted by that foam over the opening(Like mentioned earlier).

So the gulp is only the volume of the box to carb boot.

Just guessing.

Shit, I'd run it with the foam out and the lid open just to get a quick question answered.

Was mean't to add this last night my time while in bed before sleep....Yeah counting Sheep!...Don't tell NeweCum.
No fun fatfingering the mobile phone in bed so now it's after lunch and on the landline.
The Odys are well known for their under designed air intake system.If you gas the throttle you can see the airbox lid suck down.
That's why they run better Lidless...or is that Lid Lovelace? Anyway they all Suck better.
There's just not enough air volume present to satisfy that initial max carb opening demand.
Also,they used a tapered inlet duct from the airbox to the carb-larger to smaller diameter...YOU?
They had the upper duct go to an open box/scoop at rooftop rear.Yours has the added pre-filter adding to the choking effect.
IF that box foam sheet is OK to use,then this is what I'd do.
Get some larger wire mesh,turn down the sides to make an upside down U shaped rack foam support that fits snug in the box.Then another U wire rack to work with the lid when closed.
The foam is now sandwiched between the 2 lower and upper wire U's...or is that ewes?
Make sure the foam level is below the air inlet upper duct and above the bottom hole.
Good luck.

Double pipe your air box.

wyeeoddy

Thanks to everybody for the help. I never claimed to be a genius, I just play one on TV. As far a the airbox is concerned: The snorkel filter up top is a UNI snowmobile unit, the most porous one they make. The green sheet in the box is the same porosity as the filter that UNI makes for the oddy. And although it does not look like it from the pic, the hole in the bottom of the airbox is 3" tapering down to the size of the carb inlet. I mounted the box with the metal bit that comes from a K&N intake, just hacked off the top to make it shorter. The tube itself is a silicon elbow.
I have tried running the machine with the lid open, no power up to half throttle. I have not tried running it closed with no filter in the box though. I will try this first. I will next look into building a rack to mount the foam in as the next step. I honestly meant to do this off the get when I built it, not sure what my reasoning for not doing it was at this point. It was about two years ago, damn I'm getting old.

Hopefully the rain will hold off around here this weekend and I can do some testing. I will let youz know what shakes out.

And again, I sincerely thank you all for your input.

One suggestion. I like the box. Nice job. I'd go to an auto parts store and try to find an automotive type of flat air filter element that would fit in the bottom of the box in place of ur foam sheet. You could use something to make a lip in the box that holds the filter a little off the bottom of the box.
Extra filtering with plenty of flow,cheap to replace and will really round off you're box design.

I like this idea. Good one.

If it was me I wouldn't run that second filter at all unless you are running in the dunes.
Like wyeeoddy said: they like to suck.
Your just choking the hell out if it with that second filter. It all depends on where you ride.
Even if some fine dirt gets into your Engine so what ?? Rebuild it. It's fun.
I run our oddy's in some very dusty enviroments here in the mountains of B.C. In fact in mid summer you have to give the other guys you ride with a one mile minimum lead between each of us or you will choke to death. I even ran with a paper filter mask on my face once. All this and I have those K&N flyscreen filters on my machines with a sock that you buy at the dollar store put over it. When the sock gets dirty I throw it away and buy more socks at the dollar store. Good enough -- I will rebuild if I have to.

I am more concerned with fuel quality to prevent detonation. Hint.

Post pics of plug. Did you try going richer on the main? Leaner on the main?

I ran an Air Striker on my Ody before I sold it. If I remember right, I was running a 165 main jet at 5000 feet.

My mods were:

Power Pros pipe
No air box with a triple wrapped pod filter
Stock reeds
Advance timing key.

Step up your main to a 165 and remove the foam out of your filter and give it a run with the lid closed. If this doesn't yield results, remove the air lid and give it a run with the 165 main. With a flat piece of foam in your box, you are restricting the air flow big time. You are drawing almost all of the air through a small area right above the intake throat. Under high RPM this will actually cause that thin piece of foam to collapse starving the Engine for even more air.

You can also try and place some type of a support under the filter to get the foam filter off the bottom of the air box. This will allow the entire surface of the filter to draw air, not just the area above the intake hole.

I am also suspect of the filter media you are using. If it is too dense it will also restrict air flow at high RPM! I don't see a drop of oil on it either!

Rand

*Update*

So the rain finally quit around these parts and I got a chance to run the old girl today. Based on canadian’s, randman’s and bugeye’s suggestion, I removed the filter from the box and gave it a rip. Guess what? Problem solved, mostly. I can get it to WOT (Wide Open Throttle) now! No stumbles, no bogging, no hesitation. I can even mash the throttle from a dig and she just goes. Still needs a bit of fine tuning, but at least now I can do a proper plug chop. I did see a 1300 on the EGTs... so it may be a bit lean on the top end.

You guys are smart, I’m dumb. Can’t believe I didn’t think of, and or try this sooner. Truth told, my machine came with a K&N filter setup on it, but I read so many stories saying to ditch it and run the airbox because they suck so much dirt into the Engine. So I went way overboard in building the intake setup, just like I did with the rest of the build. The good news is seems the airbox actually works, I just won’t use the extra filtration.

I can’t thank you all enough for helping me through this! I’m super stoked! Now I can get down to the last bit of jetting. I will keep you posted.


Two more semi related questions. My machine has a Comet 102 clutch on it. Anyone know what top speed with a 24” rear tire should be? Max RPM? Just curious what kind of numbers I should be looking for.

Thanks again!

viewtopic.php?f=1&t=14889&hilit=top+speed+of+an+oddy
I run a 24" tire and have a 102c.

I think I have to clue you in right now. I can feel your excitement right through the internet. Please read this: viewtopic.php?f=2&t=15887&hilit=top+speed+of+an+oddy
Start a page one please.

The reason I post this is obvious after you read it.
The oddy's have a deadly flaw. We sit low and have no distant vision of what is ahead. The quad and dirt bike guys are up high and get lots of warning -- we don't.
Your on your own. You have been warned.

Good to see your throttle problem solved.Now don't forget to swap out that too small of a screen in your box to a larger grid hole size.Even tho you say your base hole is 3" ...but with all that small screen wire surface area, I reckon that it's more like 2" if your lucky, negating the 3" taper down design.
Otherwise you'll be jetting down from where you should be to compensate.

ewe see you can never have a big enough base hole. It needs to be able to suck.

Update time. It has been a few since I had time to mess around with the oddy...I have been stuck tracking down a boost leak on my girlfriend's Subaru in my spare time, but this problem is solved.

I was running on the 158 main jet when I made my last post, which was too lean. I have since tried the 162 (too rich) at least for the current configuration of my airbox. I settled on a 160 main, it seems just about perfect for the amount of air I'm getting in there. It is still a bit rich on the top end, however. But, according to the EGT readings I'm getting, it is in a safe range. I am going to try Buggeye's suggestion of swapping out the screen in the box for one with bigger holes and see where that goes. I may end up back at the 162. Either way I know I'm very close. I can now go WOT (Wide Open Throttle) from a dig with no bogging or hesitation whatsoever. It is completely drivable at this point. I also was able to hit 60 MPH before I ran out of road on my last test, so it would seem that the top speed is there as well. I realize that top speed isn't the end all be all, but I wanted to know that the machine is capable. 60 MPH is actually fairly terrifying in that thing.

Canadian Oddy, Thank you for sharing that post about your accident. I have been humbled by just reading it. Thankfully you made it out alive, and recovered. It's easy to forget how dangerous life can be until you hear/read a story like yours. Thank you for slapping me across the face with that.

Lastly, I want to sincerely thank you all for being patient and taking the time to help a guy out! There is now one more Odyssey saved from the scrap heap of history. For that I am truly grateful.

Once you get your airbox and main jet dialed in, try lowering the clip on the needle (Richer) to see if the middle-throttle picks up more (or less) power. Fine-tune your middle end mainly happens with seat-of-the-pants feel, but you can also do some plug chops. You don't want the middle to be too lean.

60mph is no joke in these things. Sounds fun. I like the color scheme.

Based on a gps reading and a truck speedometer the oddy will do 63 mph. That's a fact because I have been there. In fact I think but can't prove, the oddy will go faster down hill. I say this because one time my brother and I were racing back to the truck going down hill on the main dirt road from the lake. I could "feel" the speed. I let off (not something I normally do). It just "felt" dangerous because the bug was real twitchy. I could feel and hear the Engine over rev.
Based on the math, an oddy with 24" tires will do 57 mph at 8000 rpm - 60.6 mph at 8500 - 64.2 mph at 9000 rpm - 67.8 mph at 9500.
So based on this math, my oddy rev's to just under 9000 rpm on the flat.
Please note that the FL350 has no rev limiter in foreword.

I been looking for this link and Found it

This might help

viewtopic.php?f=1&t=17190&p=165427&hilit=air+intake+elbow#p165427



wyeeoddy

wyeeoddy:

That silicone elbow you posted is exactly what I used to connect the airbox to the carb. I have had zero issues with it coming loose or popping off. It's quite a tight fit... That's what she said.

That's good to know as I have been looking for a supplier in Oz but no luck yet
as I try to fine local supplier first before I buy OS.

Quote ""It's quite a tight fit... That's what she said.""

"O" to dream LOL LOL LOL