Topic: Good carbs to look into?

[wenger828]

Got the whole motor apart, sending out to powder coaters tomorrow. I don't plan on upgrading the displacement of the motor (kinda a budget build), but am interested in going with aftermarket carbs on my 78' cb750f. i hear that the stock keihin pd carbs don't like pods, and i like that look. i also heard though that certain carbs are 'too much carb' for the 750.. what would be a good carb for the stock displacement? (and maybe down the line i'll upgrade to a bigger displacement)

[SOHC Digger]

No carbs really "Like" pods, and in my opinion, properly tuned PD's are great carbs for stock 750's.  Many guys prefer then especially for the accelerator pump feature.  I kept the stock PD's on my 78F and I'm happy with them.

[wenger828]

so if i were to install pods would the carbs need to be rejetted?

[crazypj]

Don't be a total dick, yes they would, it will run worse, the fact you asking means you should leave it stock

[Bankerdanny]

PJ, did he delete a post, because if not I don't get the rude response?

He asked his question politely, and it's a perfectly reasonable one if you don't know much about carbs. If you can't respond in a similar fashion then don't respond at all. Everybody was ignorant (in the lack of knowledge about a certain subject sense) at some point in their lives. Instead of calling him a name like a 9 year old, help him out and educate him.

[wenger828]

thank you.. it's a simple question. i'm more than capable of doing the work, i own a 6 bay repair shop in my town. when it comes to carbureted bikes though, i'm not too knowledgeable hence why i come here to ask. now i do plan on getting different carbs, just want to make sure i dont get anything thats "too much" for the motor. as stupid as it sounds, i really want to go with pods or velocity stacks because that stock air box really doesn't look pretty. not only that, having the room incase down the line i do decide to upgrade engine displacement.

[Bankerdanny]

If you want to stick to a reasonable budget, keep your original carbs and (if you have it) the stock airbox.

Installing pods generally does requires changes in the jetting, which is a pain on our bikes because you have to pull the carbs.

Pods are somewhat controversial on the smaller (550 and under) SOHC's as almost every complaint I have seen here (and there have been many) about a poor runnning 500 or 550 includes the words "my bike has pods".

The 750's seem to handle them better, and with fewer complaints.

I like the look of pods, but I don't think you get much of a performance boost on an otherwise stock bike. So if you are keeping the stock side covers and have the airbox I would advise just keeping the stock setup rather than introducing the vagaries of pods.

[jneuf]

If you're hell bent on pods, I'd just keep the stock carbs and rejet.

[Bailgang]

I too prefer the looks of pods and would ditch my factory airbox in a heartbeat IF I could only get the factory carbs to work well without the airbox. I tried pods when I first got my 550 together because the factory box was missing some pieces and I was always making a compromise when jetting the carbs. It wasn't until I was riding in a very strong cross wind and the engine was running silly because of it that I got the parts I needed for the stock air box, ditched the pods and the bike immediately started to run like it should.

You say you don't have any experience with carbed bikes, well you're going to be in for a rude awakening by starting out messing with pods. I'm not trying to sway you away from using pods in fact I admire your willingness to try, I'm just fore warning you of the headaches you're going to deal with. This particular forum probably isn't the right one to be asking your question in the first place so you might want to pop this question on the high performance and racing forum on this site. Good luck

[wenger828]

thanks for the input guys.. now let me change my question a bit.. would getting CR29's be overkill for the stock engine displacement? I do plan on getting a motogpwerks pipe and like i said, down the line (maybe next winter?) i'll probably be increasing displacement.  i just remember someone mentioning in another thread that the cr29's maybe "too much carb" for the stock 750 displacement, and that sorta stuck in my head, is this true?

[xnoahx]

Those carbs are meant for racing and don't have the around town drive-ability of your stock carbs.  I would stick with the PD carbs and go through them to make sure everything is working as it should be.  They aren't tricky carbs to work with and you already have them so they wont cost you any money beyond some jets and gaskets.  I say if you want to run pods, run pods.  Just get them knowing that most peoples experience with them is not smooth sailing.  Maybe your happiness with them will just depend on how picky you are.

[wenger828]

Those carbs are meant for racing and don't have the around town drive-ability of your stock carbs.  I would stick with the PD carbs and go through them to make sure everything is working as it should be.  They aren't tricky carbs to work with and you already have them so they wont cost you any money beyond some jets and gaskets.  I say if you want to run pods, run pods.  Just get them knowing that most peoples experience with them is not smooth sailing.  Maybe your happiness with them will just depend on how picky you are.

thank you for your honest feedback.. i'll stick with the pd's in that case and see what happens

[bjbuchanan]

You can do the mods and more with stock carbs and they can handle it. A rejet, pilot size up and messing with needle clips and screw turns can help you dial it in. Look up in project thread the guys that made the 550/650 hybrids and other stuff. Most use stock carbs and for the engine size they have balls.

For wayyyy less money you can have some really dialed in stock carbs and use the money to make that bike faster

[crazypj]

PJ, did he delete a post, because if not I don't get the rude response?

He asked his question politely, and it's a perfectly reasonable one if you don't know much about carbs. If you can't respond in a similar fashion then don't respond at all. Everybody was ignorant (in the lack of knowledge about a certain subject sense) at some point in their lives. Instead of calling him a name like a 9 year old, help him out and educate him.

 There is a search function, some of us get fed up either answering the same question or doing the searching for them
Stop being such a pussy, motorcyclists used to be real people not a bunch of wannabe poseurs..........and yes, I would say the same face to face, I'm pretty sick of the OTT political correctness don't offend anyone BS
 You can make any carb's of the correct size work, on a 750 or 900, 28mm is about max venturi size, they will cost around $7~$1,200
Having a 6 bay garage means you work on cars, modern, fuel injected (speculating)
If you worked on 'classics' those carbs would be simple to modify, PD's are not and never will be 'race carbs' either Mikuni Smoothbore, Kie-Hin CR or even old AMAL monoblock are closer to 'race'

[wenger828]

sorry crazy pj, my main question was to whether or not it was worth me going aftermarket carbs on the 750 or would it be over kill for the stock motor. like i said, i plan on upgrading displacement next year and do want to run pods/velocity stacks. and yes, i've done my searching, i know how these forums work and how there'll always be those people that'll get all pissy and complain about not using the search function. and from what i've gathered on my research, the PD carbs are limited in terms of adjustability & don't work well at all with anything other than the stock airbox.

[crazypj]

Your OK, the PD's do have limited adjustability, the accelerator pump is adjusted with needle nose pliers (Yep, you have to bend the arm to spec)
 I would probably look for Suzuki GS1000 or Z/KZ900/1000 Kawasaki slide carbs, (Mikuni's)
 Your REALLY don't want individual cables and carbs, just about impossible to keep in sync
 The cheap cop out is fit dual carb manifolds (although that seems pointless to me, if you want less power, buy a smaller bike)
 Many of the later Mikuni CV carbs can be made to work quite well I just don't know which ones (Later Kawasaki, some Honda and a few Suzuki/Yamaha used TK, I don't like them, they are about as difficult as Kei-Hin to set up with anything other than stock airbox
I'll check manifold spacing on Suzuki GSX/GSX-R/GSF 'oil boiler', there is a ton of information on setting them up with pods, they were in production from 1985 until 2007 (don't know if they will fit your bike though?)

[dave500]

you must know something about carbs and engines in general?like its the same as you cant just drop a super duper holley in place of whatever stock carb a car has and hope you get more power or what ever your dreaming of?

[wenger828]

you must know something about carbs and engines in general?like its the same as you cant just drop a super duper holley in place of whatever stock carb a car has and hope you get more power or what ever your dreaming of?

i know how carbs work lol, its just for these particular bikes, im not sure whats good and whats not.

thnks for the info pj, will look into what you mentioned