Below is the info you need to get pod filters dialed in on your 79-82 cb650.
79-80 (mechanical piston slide carbs)
- 120 main jet (stock is 92)
- 42 slow jet (stock is 35)
- mixture screws set to 1.75 turns out
- float height set to stock measurement
- mac 4-1 header / exhaust (ebay)
- emgo 48mm pod filters (ebay) – (you have to slightly modify the 2 inner pods to clear the choke, i doubled up the rubber sleeve and used rubber epoxy to seal, glue them together)
- Better than pod filters are velocity stacks. Bike runs best with these. They’re a little hard to find though. You want 43-46mm
All jets bought from either:
81-82 (constant velocity slide carbs)
DynoJet makes a kit. All the info you need is on below links (the kit says 80-82, but that is a typo… it will only fit 81 and 82):
* Note
All this info for 79-82 is dependent on the fact that you’re living around sea-level, and your carbs are already running good. If you have shitty carbs, you might wanna rebuild them and get them clean as fuck before you attempt putting pods on. If you’re high up in the mountains, you want slightly smaller jet sizes than what I spec’d out.
* Note
The cycle will run a little hotter, simply because you’re going to be making a significant amount more power than stock. Makes sense that more power (more of an explosion in the combustion chamber) is going to create more heat. To offset this extra heat, I recommend adding an oil cooler. INFO FOR THAT HERE. Also, for 79-80 carbs, my set up is the tiniest bit rich, so it’s absolutely not running lean. Lean would add extra heat. My spark plugs have been a perfect light-golden brown for over a year now.
-Ed
August 5th, 2010 at 4:12 pm
thank you once agian for the info ed this has been very useful where are you from?
August 6th, 2010 at 7:44 am
we all live in center city philadelphia. where about you?
August 6th, 2010 at 2:16 pm
good info. now one for the 55o please.
September 5th, 2010 at 12:34 am
Iam having one hell of a time trying to set up these carbs for the pods 1980 cb650 piston valve carbs my main jets were 97.5 and slows 35 now I have #120 and #45 for slows i was told the 45′s were easier to set the mixture the bike was running way to lean now its to rich Can someone tell me how to set the mixture screws do you turn them all the way in until they stop turning then turn them out i think Iam going to go crazy should I just order 42′s and start over I will tell you the bike sounds really good with the new jetting doesn’t even sound like the same bike I just dont want to blow the engine If someone can help me out that would be great. Thanks
February 16th, 2011 at 2:27 am
Where did you get the seat? I need to get one for my CB650 and your’s is one of the nicer ones I’ve seen
February 16th, 2011 at 3:56 am
just emailed you details…
but pretty much, I had to modify the seat pan so it’s a little slimmer and shorter, and then I had it custom upholstered at a place here in Philly called J&J auto upholstery.
-ed
April 10th, 2011 at 12:50 am
i was just wondering do i have to go with the exact jet sizes for the pod mod or can i go slightly smaller?
April 10th, 2011 at 10:32 am
Well…
You can go to smaller jet sizes if you’re at higher elevation where air is thinner.
I’m in Philadelphia real close to sea level.
My current set up is:
- 42 slow jet
- 120 main jet
- velocity stacks instead of pods
- mac 4-1 exhaust
… And my 650 runs awesome. Fast as shit, no flat spots in rev range. Not much difference between pods and velocity stack. With pods it ran a tiny bit rich. With v stacks it’s balannced a tiny better.
April 14th, 2011 at 2:35 pm
also i have the keihin pd50a mechanical slide carbs and my slow jet is pressed in how did you go about that?
May 4th, 2011 at 1:45 am
I just got pods and the bike is running ALL sorts of different. Bogs when you start it,, when it starts, and then when you idle it through that it revs fine. You think jet size? Qand in my manual it said that stock jet size was 90 for the main ?
May 4th, 2011 at 1:48 am
O yeah have not synced them yet and no baffle.
May 4th, 2011 at 10:52 am
just emailed you. i’ll walk you through it all.
-ed
May 4th, 2011 at 10:53 am
@bryce
the slow jet is pushed in.
get a pair of vice-grips and pull them out.
they’ll tap back in once you’re done cleaning them.
-ed
May 14th, 2011 at 10:44 pm
How’s is going. You get a chance to copy the links for the correct jet sizes?