Carbs - What fits?

Hey guys, I'm obviously new here. I recently acquired an '82 650 Maxim, but the carb's are gone. I plan on going through the bike entirely considering it's sat for 11 years, and the end goal is to have it resemble a bobber/brat that I can take on longer rides if I want to. After doing a search on here, I've seen a few things regarding carbs, especially when it comes to the pod filters. Considering the direction I want to take this, it seems like pods are what I want and that they don't necessarily play nice with the factory carbs.

This leads me to my question. Are there any carbs out there that are readily available and a direct replacement for the factory parts? Alternately, am I better off sourcing a replacement set and rejetting?

Thanks for your time.

 

Don't go with pods unless you really want to have to constantly tinker with it. If you're gonna go a bob/rat direction, then pods would LOOK the best, but...........................

For carbs, you can get a set of 650 Maxim carbs and clean them and run it, or a set of 750 Maxim carbs and swap out the jets for the 650 sizes. Some of the 550 carbs will work too, again you'll have to swap out the jets for the correct sizes.

Dave F

 

The 550s run Mikunis BS28's. They won't work on the 650 Maxim.

You need a set of Hitachi HSC32's from a 650 or 750, Maxim or Seca, plus maybe some jets.

 

Thanks, guys. So what I'm getting from this is that there's not another bike I can pull the carbs from that would work better with the PODs. I guess I'll get to hunting. I plan on rebuilding them, so jetting won't be an issue.

 

Well, ... if you have gone-over the pros and cons, ... you should surmise that the feat is easier said than done.

I think if I was going to build a Bobber using an XJ750 Platform; I would look for a set of Early Mikuni Smooth Bores (RS34-D21-K's) off a Vintage KZ-900 and make an attempt to fabricate them to fit the project.

 

Thanks, Rick!

I have read many different opinions on the re-jetting, but if it's my only option it's a chance I'd take. Considering your comment about the early Mikuni smooth bores, I'm going to assume you think they are some pretty awesome carb.

Thanks again!!

 

There's a nice set on EBay going for $850.

Because they are revered as "Performance" Carbs; them that has 'em for sale get top dollar.

 

The biggest problem with installing pods on these Hitachi carbs is that you kill the velocity(air speed) of the air moving through the carbs, this does not allow the air to pick up and atomize the fuel properly, or enough vacumm to operate the slider properly.

I would steer clear of cv style vacumm slider carbs, and go with something like the Keihin rocker mechanical style found on late 70's honda.

Ghost

 

Multiple avenues to take. Good stuff!

$850 for a set of carbs seems a little steep for me, but then again, I haven't been looking for them for too long.

Until I find a set, I'm open to any suggestions!

 

Want to take a GIANT Step toward alleviating the Lean Condition caused by Pods?

SEAL the Kidney-shaped "Atmosphere Vent" on the INSIDE of the Horn, ...
>> This opening is subjected to Turbulent Vortical Air Flow when PODS are fitted.
The Vortical Flow ... reduces air pressure at the opening.
The Negative Pressure ruins two important functions.
1. MAIN AIR JET Air Supply is drastically reduced, ... MAIN AIR needed to surround the Emulsion Tube to help siphon Main FUEL Supply gets reduced.
2. The resulting NEGATIVE Pressure makes it MORE DIFFICULT for the Diaphragm to collapse resulting in a Slower and/or Restricted rising of the Piston.

Cover the Kidney-shaped Orifice Atmosphere Vent.
Open the Orifice EXTERNALLY to Atmosphere.
Tight-fitting Hoses joined with Tees will suffice.
Add a Inline Filter to the Hose vent to keep-out particulate.
Hide the plumbing.

 

Thanks, Rick...has anyone tested this? It looks relatively simple. Any recommendations for what to use for the seal?

 

search for the beer can mod. From what I've heard, it severely reduces the airflow of pods and reduces the lean condition. Just a suggestion.

 

I'd use a Patch of Vinyl or Plastic secured with an Epoxy or some SAFE permanent sealant.

In the event that the Patch and Sealant dislodged; I'd want the material to be completely non-destructive and consumed by the Internal Combustion.

Vinyl Hose "Press-fit" into New Drilled Vents could be connected using Right Angles and Tees to a Common Vent Hose terminating at a Inline Filter attached to the Frame after the Coils.

 

How big of a hole should be drilled? I'm having the pod issue deal with my bike

 

This is still an experiment. Nobody has reported back on the effectiveness of this mod.

 

Alright thanks. I have pods and straight pipe on mine. The jets are 40 and 120. Should I switch them to something bigger?

 

You should put the airbox back on.

 

I don't have that or I would. Got this bike in trade. And everything is already done the way it is. Pretty cheap answer there

 

By chance do the numbers on the little tabs on the diaphragm make a difference? I've got 5b, 4b, 14b, and 18b. Just a thought. Tearing down and cleaning. Also where can I find jets for Hitachi carbs. Mainly like a big kit or one that has several sizes in it? Thanks ahead of time

 

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