Can't figure out correct fuel mixture? Please help.
#1
Can't figure out correct fuel mixture? Please help.
Info:
97 CBR F3
Denver (5k average riding elevation)
Yoshi slip-on
K&N filter
She couldn't get above 10k rpm under load no matter what I tried (in neutral she would just fine).
I put in larger mains (140 142 142 140) huge jump I know but the PO had them jetting 138 140 140 138 already and I felt she was running lean before I opened the carbs up. I threw in the larger mains just to see while I waited for the smaller ones, and she now can make it to redline but I have to hold WOT for a bit and she struggles to get there.
Throttle position has so discernable impact. I can crack it wide open and she'll climb just fine until 9k and start to sputter up to redline. Any ideas?
97 CBR F3
Denver (5k average riding elevation)
Yoshi slip-on
K&N filter
She couldn't get above 10k rpm under load no matter what I tried (in neutral she would just fine).
I put in larger mains (140 142 142 140) huge jump I know but the PO had them jetting 138 140 140 138 already and I felt she was running lean before I opened the carbs up. I threw in the larger mains just to see while I waited for the smaller ones, and she now can make it to redline but I have to hold WOT for a bit and she struggles to get there.
Throttle position has so discernable impact. I can crack it wide open and she'll climb just fine until 9k and start to sputter up to redline. Any ideas?
Last edited by Kevin Hamilton; 07-03-2017 at 03:54 PM. Reason: Grammar
#2
Info:
97 CBR F3
Denver (5k average riding elevation)
Yoshi slip-on
K&N filter
She couldn't get above 10k rpm under load no matter what I tried (in neutral she would just fine).
I put in larger mains (140 142 142 140) huge jump I know but the PO had them jetting 138 140 140 138 already and I felt she was running lean before I opened the carbs up. I threw in the larger mains just to see while I waited for the smaller ones, and she now can make it to redline but I have to hold WOT for a bit and she struggles to get there.
Throttle position has so discernable impact. I can crack it wide open and she'll climb just fine until 9k and start to sputter up to redline. Any ideas?
97 CBR F3
Denver (5k average riding elevation)
Yoshi slip-on
K&N filter
She couldn't get above 10k rpm under load no matter what I tried (in neutral she would just fine).
I put in larger mains (140 142 142 140) huge jump I know but the PO had them jetting 138 140 140 138 already and I felt she was running lean before I opened the carbs up. I threw in the larger mains just to see while I waited for the smaller ones, and she now can make it to redline but I have to hold WOT for a bit and she struggles to get there.
Throttle position has so discernable impact. I can crack it wide open and she'll climb just fine until 9k and start to sputter up to redline. Any ideas?
#3
Thanks Cab, I just ordered some new mains and pilots. What is a DAI system? Dual air induction?
#4
Hi DAI (Direct Air Intake) rather like the ram air system, the solenoid is connected to the speedo , but riders usually do the clean air mod taking out the solenoid, pics on You Tube
#5
Also, if I were to bypass it, would I have to rejet? I also have the fuel pump bypassed, for what it's worth.
#8
Info:
97 CBR F3
Denver (5k average riding elevation)
Yoshi slip-on
K&N filter
She couldn't get above 10k rpm under load no matter what I tried (in neutral she would just fine).
I put in larger mains (140 142 142 140) huge jump I know but the PO had them jetting 138 140 140 138 already and I felt she was running lean before I opened the carbs up. I threw in the larger mains just to see while I waited for the smaller ones, and she now can make it to redline but I have to hold WOT for a bit and she struggles to get there.
Throttle position has so discernable impact. I can crack it wide open and she'll climb just fine until 9k and start to sputter up to redline. Any ideas?
97 CBR F3
Denver (5k average riding elevation)
Yoshi slip-on
K&N filter
She couldn't get above 10k rpm under load no matter what I tried (in neutral she would just fine).
I put in larger mains (140 142 142 140) huge jump I know but the PO had them jetting 138 140 140 138 already and I felt she was running lean before I opened the carbs up. I threw in the larger mains just to see while I waited for the smaller ones, and she now can make it to redline but I have to hold WOT for a bit and she struggles to get there.
Throttle position has so discernable impact. I can crack it wide open and she'll climb just fine until 9k and start to sputter up to redline. Any ideas?
#9
I know, I'm essentially wondering if there would be any downside to taking it off; if it cuts out a variable with no discernable loss then hell yeah I'll scrap it.
Didn't know you could, there's no clip notches on mine and I thought you could only shim it richer (washers) without moving a clip.
That's what I was confused about initially but I could have sworn it was running lean with how she was running and the fact I have an aftermarket filter and pipe (probably less of an impact on a/f ratio than I first thought). Unfortunately, for whatever reason I somehow didn't even notice the richened main jets the first two times I pulled the carbs so I ordered the bigger jets prematurely.
I'm going to order 130s, 132s, 135s, and probably 38 slow jets. Should I put anything else on that order before I place it? I'm sick of paying S&H for small mistakes. Thanks guys.
Didn't know you could, there's no clip notches on mine and I thought you could only shim it richer (washers) without moving a clip.
I'm going to order 130s, 132s, 135s, and probably 38 slow jets. Should I put anything else on that order before I place it? I'm sick of paying S&H for small mistakes. Thanks guys.