1983 pod filter switch

bentwrench

bentwrench

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So I've switched the airbox to pods, and am running out of fuel in the high range. I was going to go up some jet sizes on the mains, but here's the thing: stock each carb has a different size main jet (L 127.5, R 117.5). I suspect it had to do with the YICS and airflow through an uneven airbox.

But now all that is gone. So any thoughts on how I should jet with pods? I'm thinking up using the L carb as a guide with better flow, and increasing one or two sizes from there (so I'll be testing out 130s and 132.5s.)

I'm open to suggestions if anyone has any.
 
I didn't know those came with different size mains. Maybe someone was in there before you and switched them?

Anyway, how did the new jets work out?
 
Yeah - the DOHC has different jets stock. Odd, I know.

New jets have arrived, as has the cooler fall weather. I will be testing this week, and will post my results!
 
there were some differences between jet on left and right sides which I suspect is due to the way fuel is delivered to the carb ie through left carb over to the right. this would affect the fuel available to the mains if the levels were different.
 
Exactly.

Got some time today. #130s are still too small - I'm breaking up under full load at about 8000 rpms.

Then, in an uninspired shot in the dark, I both increased the mains to #132.5 and raised my needle by a notch (Canadian needles have notches woot!) which gave me full power through to redline, but huge flat spots in the middle.

Then I ran out of time.

So tomorrow (or on the weekend), I'll do it properly, and leave the mains at 132.5 while keeping the needle in the stock location.
 
150 mains and 45 pilots on my '78 with free-flowing exhaust only and stock air box. Right side is still lean, left side perhaps a tad rich.

Oh, and the needle is raised maximally.

It pulled hard all over the range before I tore it down.

I won't know for certain about performance until I finish my top-end rebuild, however.
 
I had different main jets in mine 2 but they were an off brand. Somebody definitly was in there. Also they were 95 and 115. Couldn't rev past 4000 rpm. Talked to the yamaha mechanic and he said that When you have a side by side you have to use the same size jet for each carbs. You only used different jets when it's a v-twin set up. Dr oped in stock 125 and boom full power. I think you probably need 140 mains at least to do pods. It Greatly increases air flow.
 
What did you end going with to get yours to run right? I've tried 135s and 140s with the needle raised a notch but its running too rich.
Mine also had different sizes. 120 and 127.5.
 
Specs on my '82 RJ seca is 127,l and 117,r for stock. IMO going up on the mains and leaving the pilot and slide alone will leave flat spots in the plane of acceleration.lha
 
Yics should still be there, although it hardly affects air flow. Its just a premix chamber basically.

Please do hammer these settings up, share them with detail, and then await my post 2 weeks afterwards singing your praises :p
 
Bike is still being worked up, and work is kicking my ass, so I don't know when I'll be able to get back to carb tuning. lhaolpa - that's what I'm worried about. But CDN carbs have an adjustable needle, so there's some room to play.
 
I have pods and a 2 into 1 exhaust. I had to keep the needles at stock setting. Tried raising them up a notch but was too rich. I went up one size on the pilots. Fuel mixture screws are at 3 turns out. Starts up every time but generally needs the choke on a little initially when cold. 122L and 125R for the mains. Gonna check the plugs again but last time i checked they seemed fine. Its been running well so haven't checked them of late.
 
Sorry for pumping up such an old post, but i need some advice.
Last year I bought 1980 XS400 and started to rebuild it and now im getting to the finish. It came with some crappy pod filters and now Im looking to buy some UNI filters. Luckily the rubber thing that original filters attach to is still there, I think UNI filters with that will work fine.
Now to the question. There are two type of filters, one fully open and one with end cap. Which one will work better or is there no difference?
Clamp-On Air Filters : Uni Filter
 
You will get a little more air with the all-foam ones, but personally I don't think enough to matter.

I'd go with capped ones.
 
I ran these on the bike in my avatar and also have a set for my Maxim that I am doing now............

POD-KITS-700x560.jpg
 
I ran 6" full foam ones on the stock H-pipe before going back to full stock setup.
 

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