Topic: 77 CB750F Jetting recommendations

[zzcoopzz]

I’ve decided to re-jet the carbs, add pod filters and upgrade the muffler.

Need info on what kind of Jets to get and where to order them. 

I appreciate all the info,
Thanks

[cben750f0]

am running pods, and a freer exhaust... i also have a 836 kit, but i have been told that if you run pods, 120's-125's on the mains is a good start... ride it and do a plug chop... also you can get a set of 16 honda mains off ebay cheap, buy some jet drills..peace

[shooty]

I have velocity stacks and 4-1 with no baffles...i put 120's in the other day and it runs great. I havent done a plug chop yet so i still might be running a little lean.

[seaweb11]

78 750K /  4 into 2 exhaust, & running pods. Ran rough with 120s and also 132s. Whent up to 138 main jets. Runs great now
All are available at your Honda dealership.

[zzcoopzz]

I have velocity stacks and 4-1 with no baffles...

what do you think about the Stacks?  are you into them or would you recommend going a different rout.  I dig the way they look but know nothing about them.

I'm going to put a shorty muffler on (4 to 1), not sure what brand to use, don't want to blow the too many ears but not looking for a bike with a weenie sound either.  any recommendations on pipes would be great.

as you might tell I'm just starting to get into my bike, I have a vision in mind but not sure how to get there.

I appreciate all the help folks!

thanks,
Cooper

[shooty]

After riding for two days with this exhaust...i am definitely putting the baffle in. It sounds mean but it is waaaay too loud. I really like the velocity stacks...they sound cool as hell at full throttle. Definitely different then pods.

[zzcoopzz]

yeah, my neighborhood would lynch me if I took the baffle out of my pipe.  I'm into the stacks, but what about everything getting sucked into the carbs, isn't this hard on your engine?

[TwoTired]

Foreign matter sucked into the combustion chambers errodes the cylinder walls at a rate comensurate with the quantity of induction.

Er, excuse me.   ahem.

Yes, it's hard on your engine.  Dust and road grime are pretty abrasive.

But, you won't notice it until it starts billow blue smoke, lose compression (and power).  Up until that time, though, you'll be stylin'. 

[shooty]

Foreign matter sucked into the combustion chambers errodes the cylinder walls at a rate comensurate with the quantity of induction.

wow those are some big words....good thing you explained it in a way us little people can understand.  Coop i put foam covers on my stacks which are just as good at blocking road debris and dust as pod filters are.

[cben750f0]

i have actually seen a bloke that modified a set of stacks, will some small spigots, the just clamped half a uni pod to the end.. he used the pod spring and everything...so he had the stacks and the lil pod on the end... thought that was kinda funky..peace

[zzcoopzz]

Ok, so I just wrote this long message about fashioning a thin filter inside the stack so to keep all junk out of the carbs...  Then the whole concept of the stack came to me...  Isn't the purpose of the velocity stack to pull in as much air as possible, and if you put a filter on the stack you might as well be putting a pod filter on it?  I could see how a foam filter would be one step past pod filter... Does it then just come down to presentation?  Because a pod filter verses a V stack with a hidden filter inside, I’d put the stack on because I just looks tough as hell.

And another thing just to get the conversation started, what do you all think about this.

http://www.cyclexchange.net/Carb%20System%20Comp%20Page.htm

What is the benefit to going 2 carbs into 4 wholes?

I understand that theses are different carbs then on my bike and are probably jetted and tuned way differently, but would this system give you more then four carbs?

Any way that’s my thoughts for the night,

Cooper

[shooty]

And another thing just to get the conversation started, what do you all think about this.

http://www.cyclexchange.net/Carb%20System%20Comp%20Page.htm

What is the benefit to going 2 carbs into 4 wholes?

I understand that theses are different carbs then on my bike and are probably jetted and tuned way differently, but would this system give you more then four carbs?

Any way that’s my thoughts for the night,

That carb setup is made for choppers with rigid frames...soi it makes using the sidecovers on a stock frame tricky. you have to notch the side of the cover because they stick out so far. If anyone has put them on without notching thats cool..i was told this by the guy that makes that setup so i didn't even bother.

[zzcoopzz]

shooty,  I appreciate the feedback on the fit...  didn't even think about that yet.  actually I was more concerned about how this might effect the performance.  if this is a good mod then it might be worth engineering something that is similar but fits on a stock frame.

50words,  thanks for the correction in how the V stack works, now that I know that I might just have to go that rout.  besides this is just the first of hopefully many project bikes to come.  I'm definitely having a good time with it all...  now If I could only afford it  Hrmmmm...

[n9viw]

I've heard from a good number of guys at Hondachopper and Slick's Choppers who have done the CycleXchange twin Mikuni mod. EVERY response, hands down, is that it is a HUGE gain in power- not just perceived, but measurable. MPG goes up, top RPM goes up, 0-60 times go down. Every single person who has worked through the inevitable jetting tuning needed with Ken has been nothing short of flabbergasted at the difference. Ken really did his homework on this one, and it definitely pays off.

Now, whether that's worth $500 to you, that's another story. 

[lucky]

78 750K /  4 into 2 exhaust, & running pods. Ran rough with 120s and also 132s. Whent up to 138 main jets. Runs great now
All are available at your Honda dealership.

Too bad you did not tell us if you changed the idle jets.