My take on a PVC intake...

got rid of the pods on my maxim x. installed my pvc 2 pod under the seat air intake. it seems to run better then before the carbs have been rejetted . before i couldnt get the thing to start it has not been started since december . a quick shot of starting fluid fired right off. the previous owner said he had a carb guru go thru the carbs and they were perfect boy was he full of it the carbs are so far out of sync if you let it idle more then about 20 sec or so it will drop a cyl or 2 if you bump the idle just a little it will idle at 2500 when you let up on the gas idle comes down to about 2k hangs there then drops. i did not want to pull the tank to get to he idle screws and sync ports. till i finish my virago project swapped out hitachi carbs for mikuni but its next .will see if i can tune the x with the pvc intake at low rpms will let you know

 

If you don't "pull the tank" you'll have to be a surgeon with special tools to get to th "idle screws and sync ports". Without th tank on, it's easy.

 

What size PVC fittings are you guys using?

 

1 1/4, and 1 1/2 rubber connectors for the carbs

 

That's what I thought. Guess they line up pretty well on a 750, but not so great on a 650 :/

 

Doh! Read AMCWood's write up. You've got to cut about a half inch or so off the tees! Makes sense now!

 

I set mine up in a similar way, but with two pods under the seat where the stock airbox used to be. After I cleaned the carbs, it ran way better than the pod on each carb. It doesn't look as cool, but I like it. Everyone told me to go back to the stock airbox too, ha!

 

UPDATE: The bike is finally back together! Life got in the way for a bit, but I took the bike out for a quick spin last night. The fuel levels are spot on (yes, clear tube method). My o-rings for the pilot screws should be here early next week so I can fine tune that aspect. Thanks, Chacal! The mixture is in the ballpark right now. No hesitation at all. The idle didn't fall as fast as it should, though. I would let off the gas and the RPM's wouldn't drop for awhile. After I stopped and chatted with my dad, I hopped back on and it seemed better. I'll be checking into that issue today. But, all-in-all, the bike runs great with the new air intake!



EDIT: Oh, yeah. One of the reasons it took so long to get it back together was the fact I had to find a new carb body. The J-B Stik didn't hold up under gas to repair the float pillar. So, after my experience with it, I would not recommend J-B Stik for float pillar repair.

 

I built a pvc intake, with the filter between 3 and 4. I used a dual foam uni dirt bike filter for trips in thr rain. I have it tuned great, especially after a year running pods. Been planning on taking pics, will try to post some tomorrow.

 

i just replaced my pods on my maxim x with a duel filter pvc intake i still have to ajust and sync my carbs. the bike was very hard to start before especially when cold and sat a while. if it would sit a week or so it wouldnt crank. now with the pvc it fires right up after sitting a week so i think its going to work just fine. i also use uni filters the k&ns medal flange hits the frame

 

What about a pvc system with a pod on each end, plus one or two between the second and third carb, which would make the pvc tubing the same as a small chamber.

 

I'd think more along the line of making the PVC intake with the filter in the center (between 2nd and third carb) to balance the intake air more, am I right? That's what I'm thinking of doing when I get around to it.
The idea of one filter on each end of the PVC is another good idea, but I don't like the idea of them sticking out and getting in the way. I have forward controls and it looks like they'd have to be tucked in to work on my bike.

 

Hey there (PainterD) how's your bike com'in along, thought it looked real sweet with that back fender, and the springs seat. Plann'in on the same set up myself this year for my 1980 XJ650 but without the ape's though. Would appreciate some info on the fitment of the fender, part#, and source and such things of that nature. You can send me a pm, or my email address is (streetmaster42@msn.com)

 

It seems like the rest of the world gets 6 months of sun and 6 months of snow... here in the pacific north wet I'd recommend aiming the elbows that go to the pods DOWN to keep out some of the rain while you're parked at the bar.

I'm running the stock boots to 4 individual pods but have been keeping my eye out at the hardware store for some rubber elbows with a 45deg bend to help stay dry. for now this rat rider just lays his glove over the right side pod while on the (left) side stand.

 

any chance that this will fit as it is? LOL
http://pvcfittings.com/graphics/manifold1.jpg

 

They look to close together to me.

 

definately to close together

 

I used two P-traps for an intake. Had the bike idling with them on but have not taken it for a good run yet.



Both filters stay under the seat out of the rain.

 

Steve:

Make the 's ... [IMG]'s ... and the Photo will appear with your text.

I'm afraid your design does not take into consideration the PROBLEM of Turbulence ... which NEEDS to be overcome.

Your design "Marries" two opposing Intakes.
There will be created inside the "Plenum" ... Massive turbulence.

Anyone who has hooked-up a Vacuum Gauge to an XJ Manifold without a Restriction device ... will tell you that there is a Very HEAVY "Pulsation" of Vacuum at the Manifold.

Whet your design does is INTENSIFY the Turbulence, ... as the L, R, L, R, L, R Vacuum "Pulsations" will get progressively Stronger and Increase in Frequency as the Engine's RPM's rise.

The AIR Stream entering the Back-side of the Carb NEEDS to be made a Swift Moving COLUMN of Air that will:

Cause a Pressure Reduction at the "Top" of the Emulsion Tube :::
(Which draws Fuel UP into the Air Stream)
Cause BOTH "Lift" and a Pressure Reduction at the Opening on the Bottom of the Diaphragm Piston :::
(Causing the Pressure INSIDE the D-P-A to Lower and the Piston to be raises by the Vacuum caused by the Rapidly Moving Column of Air.)

The AirBox Rubber Boots act as VELOCITY STACKS to BOTH Shape and Increase the Speed of the Intake Air.

Eliminating Turbulent Intake Airflow if a major obstacle to overcome in order to make Pods even begin to let the XJ Engine with Constant Velocity "CV" Carbs "Breathe" right!

 

liking the PVC idea,im going to run something likewise,was wondering what size K&N filters are on the end?