Air/fuel screw mixture confusion

Posted: Mon Mar 31, 2014 3:20 pm

According to SeanG's instruction it's 3 turn out but Honda manual says 1,3/4 . I was wondering which one should I follow ?
I have another question that what would happen in long/short-term if a bike runs lean or rich ?

Posted: Mon Mar 31, 2014 4:06 pm

I'm not going to argue with Sean, but 1 3/4 turns out sounds right. Maybe a typo.? Confused

Posted: Mon Mar 31, 2014 4:19 pm

It's a PILOT screw .

1 3/4 was to appease the EPA , not performance .

Remember that every machine is different and so the 3 turns out is simply a starting point . Your machine may be best at 2 1/2 or 3 1/2 ???

Too rich will make your motor will gain carbon and lose performance and the other side , too lean , will burn metal to the point of uselessness .

Posted: Mon Mar 31, 2014 5:13 pm

are you afraid of the EPA?

Posted: Mon Mar 31, 2014 6:06 pm

So how can I find out which one is best for my bike ?

Posted: Mon Mar 31, 2014 9:14 pm

set them at 3 turns out, then ride it

if it bogs, turn them out 1/2 turn each more

it isn't rocket science

Posted: Mon Mar 31, 2014 11:08 pm

How would you know if you might like a new recipe ?

Try it . If it doesn't work try something else ...

Posted: Tue Apr 01, 2014 2:30 pm

Thanks for all the help .

Posted: Tue Apr 01, 2014 2:35 pm

Trial and error.

I was bored and messed with mine only to learn that 2.5 was right go figure. That is what the CB900 calls for.

Posted: Wed Apr 02, 2014 11:12 am

The Honda manual describes an "idle drop" procedure. The setting that it gives is a starting point. I don't remember the exact procedure (it's in the manual anyway) but you're supposed to have a precision tach hooked up and then adjust the screws to their final setting. This is a somewhat involved procedure and Sean has given us a shortcut around it. I'd recommend to start with the screws where he says, then adjust if necessary. I never found it necessary to change mine.

Posted: Wed Apr 02, 2014 11:23 am

Never could get an idle-drop to work. But what I DID do was plug a Colour-Tune in and adjust the pilots to max blue - turns out it was right at 2-1/2 turns on my 900. I haven't tried it on a 750 or 1000, but I'll bet it's mighty close to what my doc calls out (btw, those settings in my doc are the consolidated wisdom of the gray-beards here on this and the 1100F board, not just my ego-based suggestions)...

Posted: Tue Aug 07, 2018 9:37 pm

Think I found my problem.....
On my number 3 carb my air cleaner boot is loose...

Would this cause it?

Posted: Tue Aug 07, 2018 9:54 pm

http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=376992#376992

Posted: Wed Aug 08, 2018 7:07 am

CV carbs don't do well with funky connections