Comments on: cb650 – pod filters

By: Bradly Givens

Bradly Givens — Tue, 20 Dec 2022 16:55:22 +0000

So I’m seeing too much confusion. Lots of good information. Just hard to decipher. 1980 CB650 mechanical carbs. Open exhaust. Pods. I live in Mississippi. So you recommend 120/42 jets and then maybe sync and dial in? Just looking for clarification. This page is awesome though. Hope it’s still active.

By: Krawcu

Krawcu — Mon, 04 Jan 2021 22:04:14 +0000

What would you like to recommend. 4in2 open exhaust and stock airbox. It has stock jets and running lean I think. I am thinking about 38-40 idle and 95 – 100 main

By: Aaron

Aaron — Sat, 11 Apr 2020 20:28:10 +0000

Hello, I’m looking to jet up to the sizes you recommended as I’m going for the same set up. Do you have the part numbers for those jet sizes ? The website link you provided is kind of confusing

By: Dustin

Dustin — Mon, 28 Oct 2019 22:12:57 +0000

@Travis Neel

For 83-85 Nighthawk 650 we have different carbs. If you have 4-1 with pod. Filters you will want to run a 40-42 slow jet. Stock is 35. And you will want to run a 125 main jet. I currently have 40 slow and 122 main jet with one shim on the factory needles and it’s a hair lean. Hence why I’m ordering 42 slow and 125 mains. I think that will be the perfect spot.

By: Devon

Devon — Mon, 22 Jul 2019 15:58:36 +0000

For anybody wondering about trying this with a 4-2 instead of 4-1 exhaust setup, this worked really well on my 1980 CB650: 4-2 exhaust, pod filters, 120 main jet, 42 pilot jet. With the stock jets I could only run on half choke and would still bog around half throttle; issue was completely solved by the bigger jets! Thanks to the author for this article!

By: AJ Oleson

AJ Oleson — Thu, 09 May 2019 01:22:48 +0000

Hey Ed,

I am having trouble confirming the exact model of my Keihin Carburetor, which is off a 1980 cb650. Looks very similar to the one that is in the pictures in this thread. What I am looking for is:

Correct Carb rebuild kit
120 main jet
45 or 42 slow jet

I want to run pod filters or velocity stacks on my 80 cb650. Currently it will run but only full throttle and fully choked with some backfiring.

Would you be able to provide links and info?

Thanks a bunch!

By: Dan

Dan — Wed, 17 Apr 2019 16:47:32 +0000

I have been searching for the recommended size velocity stacks, but cannot find them. Would you mind telling me where you were able to purchase these?

By: Travis Neel

Travis Neel — Mon, 15 Oct 2018 19:02:46 +0000

I bought a 85 Nighthawk 650 over the summer that sat for 30 years. I took it to Scott at Alpha Dog Custom Cycles to clean the carbs and get it running. He insisted it had to be rejetted to account for ethanol. So he went up 5 sizes on the main and yanked the air filter snorkel off. It runs like crap and killed the fuel economy. As a test, I ran 10 galones of 92 octane ethanol free (5 tanks) on my 83 Nighthawk and it made no difference at all. Scott totally messed up my bike. And he kept my stock jets. Anybody know what the stock sizes are for the pilot and main? Thanks so much

By: scott

scott — Sun, 22 Apr 2018 05:21:08 +0000

got my 1980 cb650c running 🙂 it runs great other then it likes the choke out just a bit no choke it does still run just bogs a bit when revved up

By: Charles

Charles — Wed, 14 Feb 2018 13:26:07 +0000

Gonna try to bring this thread back to life. I recently got a 1980 CB650 Custom. I’m going to run v stacks and straight pipes cut short behind the stock mufflers. I know it’s been asked before, but I didn’t find an answer. What jetting/idle mixture/needle adjustment would I use for this? I’m pretty much sea level (Florida).

By: Glenn

Glenn — Thu, 05 Oct 2017 22:57:38 +0000

Hii

I live in Denmark, the temperature in summer is 20 degrees.
Do you want to use 120 main jets and 42 slow jets, with pods filters on
My cb650z 1979, Keihin PD51A cab.

By: Ethan

Ethan — Sun, 23 Jul 2017 18:48:51 +0000

Alright so I finally got my kit shipped to California, put it on as instructed though I didn’t check or adjust my float bowls. The bike will start up pretty easily but just pours gas out of the air filters. Seems to be all 4 pretty equally. So would that be my float bowls needing some major adjustment or perhaps the needle and the pin needing to be adjusted another notch?

By: Eric D

Eric D — Sun, 14 May 2017 12:50:23 +0000

thanks for this great info! i went with the 42/120. everything runs great, expect at cruising speed the engine seems to want to search. once i pull the choke out 1/4 it clears up. i went to a 125 main and it still does it. what is next?

By: Steve D

Steve D — Wed, 05 Apr 2017 01:37:06 +0000

Just wanted to say thanks for the jet size info. I have a 1980 CB650, followed the 120/42 with pod filters and it idles great, lots of power and responsive. No issues at all.

By: Torry

Torry — Thu, 30 Mar 2017 20:48:08 +0000

The link provided for the 80-82 dynojet kit doesn’t work. I went to their website and I did find a kit, but I’m unclear if it’s bumped up jets for the pod application or stock jets. Also, does your recommendations for exhaust and everything else from the older models apply to the 80-82 as well

By: Ethan

Ethan — Thu, 09 Mar 2017 03:22:26 +0000

I have an 81 cb 650 that i just put pod filters on and I was looking to order the jet kit listed here but apparantly they dont ship to california? is that right, and is there any way around that or another kit I can get?

By: Dominic

Dominic — Mon, 15 Aug 2016 13:39:57 +0000

Joe have you sync the carbs first and invest in a gunson color tune if you want to get the mix ratio with out the faf of playing

By: Joe

Joe — Fri, 01 Jul 2016 02:21:33 +0000

I have a 79 cb650. Converted the jets to 120 and 42’s. Emboldened pods. Mixture screws out 1.5. Starts and idles well. Sounds great. But only runs well with almost full choke. Any ideas? Too much air? Trying new plugs tomorrow. Thanks!

By: Dominic

Dominic — Mon, 27 Jun 2016 21:34:50 +0000

worked a treat on my CB 650 z trike drilled both jets out so the fast jet was reading 48 and the slow jet 125 I couldn’t find 48mm pods so had to use 50mm cleaned carb to hell followed the instruction’s about float setup and mixture screw position also put an in line filter on the fuel line already had a four to one exhaust fitted on a oil cooler I picked up to help displace the heat form the increased fueling so first trial was delayed started on the button and ran well sounding awesome thanks for your thread

By: Jeremy

Jeremy — Mon, 20 Jun 2016 15:40:04 +0000

hey, dont know if this thread is still active but its worth a shot. great start out for the rejetting btw, but my question is, is there anything that needs to be done to the needle, like spacing and such when you rejet? i have an 80′ cb650 and ordered the jets and pods. I just would like to make sure there isnt any other odds and ends that were left out in this build that i would need to know when tuning the carbs. also, did you just put a breather filter on the ventilation port? please let me know when you can or any others, if this is still being seen. thanks!