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highest rpm method

  • Thread starter Thread starter shibby_cbs
  • Start date Start date
S

shibby_cbs

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so i am trying to tune these bad boys in and no matter how i turn cylanders 1 and 2 the rpm never changes...3 and 4 are working wonderfully...one thing i did notice was a little bubbling up from screw number 3...i know when i got my o-ring kit from robert barr it did not come with these o rings...anyway...what would be causing the unresponsiveness from carb 1 and 2?
 
Have you synched the carbs?
If those two cylinders aren't doing their share of the work at idle, turning their screws won't effect the RPM at all. Or you could still have some of the pilot circuit passages blocked.
 
tkent02 said:
Have you synched the carbs?
If those two cylinders aren't doing their share of the work at idle, turning their screws won't effect the RPM at all. Or you could still have some of the pilot circuit passages blocked.
Click to expand...

I bench synched them yes....pilot circuit passage?
 
Vacuum synch them.
If the cylinder is not doing any thing at idle, there is little or no airflow in that carb, which means no fuel is moving anywhere in that carburetor. The other cylinders have air moving through them, so they are pulling fuel through their carburetor, and you can adjust the mixture on them. Do the vacuum synch to make sure they are all doing about an even share of the work, then adjust the idle again, hopefully all the screws will have some effect.

Even after a good bench synch, there are always one or two cylinders that are way off and need to be adjusted.

If the passages of the pilot circuit are clogged, the mixture adjustment on that carb won't work correctly, as there is no mixture to adjust.
 
tkent02 said:
Vacuum synch them.
If the cylinder is not doing any thing at idle, there is little or no airflow in that carb, which means no fuel is moving anywhere in that carburetor. The other cylinders have air moving through them, so they are pulling fuel through their carburetor, and you can adjust the mixture on them. Do the vacuum synch to make sure they are all doing about an even share of the work, then adjust the idle again, hopefully all the screws will have some effect.

Even after a good bench synch, there are always one or two cylinders that are way off and need to be adjusted.

If the passages of the pilot circuit are clogged, the mixture adjustment on that carb won't work correctly, as there is no mixture to adjust.
Click to expand...

Well I know those two crabs are doing something because she is firing strong on those two cylanders
 
shibby_cbs said:
Well I know those two crabs are doing something because she is firing strong on those two cylanders
Click to expand...

But is it firing strong at idle or only when you open the throttle?
Vacuum synchronizing is routine stuff, very easy and quick, and required if you want a half assed running bike...

I don't really care how poorly or how well your bike runs... I'll never ride it. But you did ask what's wrong with it.
 
tkent02 said:
But is it firing strong at idle or only when you open the throttle?
Vacuum synchronizing is routine stuff, very easy and quick, and required if you want a half assed running bike...
Click to expand...

alright...i didnt come across that procedure when looking through the tutorials but i will deffinately look for it again

tkent02 said:
I don't really care how poorly or how well your bike runs... I'll never ride it. But you did ask what's wrong with it.
Click to expand...

WTF?
 
shibby_cbs said:
(snip)

WTF?
Click to expand...

He's saying that you can do anything that you'd like to do to your motorcycle and it's your choice and yours alone. Y'know, you can have your bike run any way you would like it to.

It's kinda like saying "Well, you can do whatcha want, but I'd do it this way..."

FWIW, there's a ton of info pertinent to your goals on this website. Use the search feature, it is your friend.
Also, check out Basscliff's website for even more.
http://members.dslextreme.com/users/bikecliff/
 
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ok...If you guys happen to know where i can find it a link to the vacuum sync would be great...wasnt able to find it...appreciate it
 
shibby_cbs said:
ok...If you guys happen to know where i can find it a link to the vacuum sync would be great...wasnt able to find it...appreciate it
Click to expand...

I just gave you one.

FWIW, there's a ton of info pertinent to your goals on this website. Use the search feature, it is your friend.
Also, check out Basscliff's website for even more.
http://members.dslextreme.com/users/bikecliff/
Click to expand...

A cursory glance over his page should reveal links to all of the information you need. The information you seek will be contained in one or several of the carb rebuild tutorials.

Good luck. I'm going to ride off to the land of nod.
 
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wkmpt said:
I just gave you one.



A cursory glance over his page should reveal links to all of the information you need. The information you seek will be contained in one or several of the carb rebuild tutorials.

Good luck. I'm going to ride off to the land of nod.
Click to expand...

Basscliffs site is what I have been going through but I wasn't able to find it...am I blind or am I missing something
 
Bubbling up from the idle mixture screw? Get some o-rings for those.
 
Hi,

Look carefully. On my site is a link to Mr. bwringer's site. That's where you'll find a carb sync guide.


Thank you for your indulgence,

BassCliff
 
Robert's O-ring kit should have come with those tiny little O-rings for the pilot screws. Not sure why they went missing but I'd get some for sure.
 
Nessism said:
Robert's O-ring kit should have come with those tiny little O-rings for the pilot screws. Not sure why they went missing but I'd get some for sure.
Click to expand...

and i thought it was weird that it didnt....ill get on that

and thanks bass..i didnt realize it was under colortune/carbtune....i guess the next step is to find a reliable tuner for a decent price
 
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shibby_cbs said:
and i thought it was weird that it didnt....ill get on that

and thanks bass..i didnt realize it was under colortune/carbtune....i guess the next step is to find a reliable tuner for a decent price
Click to expand...

I'm sure someone on this forum in your local area would have the tools you need, no point in buying one until you know what you want.
 
I was talking to a guy yesterday that has a 73 Kawi 900. I was telling him how my bike clunks and rattles at idle....like a bad clutch. And thats what I thought it was.
This guy says no...that the carbs need sync-ing.

Funny he should say that coz my bike didn't do it before I rebuilt my carbs. Also..this guy has a manometer and when he does his 900, he says he'll do mine at the same time :D
 
A clutch rattle can be made to rattle a lot more with out of synch carbs, in fact even a bad rattle can be made to not rattle much if the carbs are synched well enough.

Will that guy just let you borrow his manometers?
 
ok i just thought of something...do i have to have the vaccume tube hooked up to the petcock when i do the adjustment
 
You're doing this with a huge vacuum leak?
Use prime and block off the vacuum line on #2.
 
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