akabek
New Member
I have a 1975 CB550 with about 200KM on it this season without issue. About a week ago while working on carb jetting I noticed while accelerating the bike would have multiple hesitations in a row until red line. Some info on my bike:
Dynoman DP592 SV pistons 10.5:1
Pamco Ultimate ignition
Ported & decked head, valve job
CB650 cam
MAC 4-1 header with Cone Engineering muffler
Keihin CR26 carbs with K&N pods.
This is my current jetting: Main 105, pilot 65, needle YY7 5th position, Air jet 220 and mix screw 1 turn out. The is the best pull I have experienced to date with jetting but while cruising below 5000 RPM I cannot go WOT without it bogging.
Yesterday I installed a fresh set of Denso plugs and the hesitation is still there. I decide to take a video and while reviewing it I discovered this was only happening in 3rd gear. I checked my fuel lines and petcock and no debris. I have in line fuel filters which I am going to remove today. I will have to check if this also occurs when the engine is cold but the hesitation also happens when slowly accelerating.
I strapped a GoPro to a helmet and took some video. The sound has a lot of wind in it but you can hear the hesitation I experience. If you listen to the gear changes you will see if only happens in 3rd gear.
To avoid watching the entire video here is where the hesitations happen
1:48
3:12
5:50
6:32
8:18
8:41
9:39
10:07
11:35
https://www.youtube.com/watch?v=qhLJc4MBov0
Any suggestions would be appreciated.
Dynoman DP592 SV pistons 10.5:1
Pamco Ultimate ignition
Ported & decked head, valve job
CB650 cam
MAC 4-1 header with Cone Engineering muffler
Keihin CR26 carbs with K&N pods.
This is my current jetting: Main 105, pilot 65, needle YY7 5th position, Air jet 220 and mix screw 1 turn out. The is the best pull I have experienced to date with jetting but while cruising below 5000 RPM I cannot go WOT without it bogging.
Yesterday I installed a fresh set of Denso plugs and the hesitation is still there. I decide to take a video and while reviewing it I discovered this was only happening in 3rd gear. I checked my fuel lines and petcock and no debris. I have in line fuel filters which I am going to remove today. I will have to check if this also occurs when the engine is cold but the hesitation also happens when slowly accelerating.
I strapped a GoPro to a helmet and took some video. The sound has a lot of wind in it but you can hear the hesitation I experience. If you listen to the gear changes you will see if only happens in 3rd gear.
To avoid watching the entire video here is where the hesitations happen
1:48
3:12
5:50
6:32
8:18
8:41
9:39
10:07
11:35
https://www.youtube.com/watch?v=qhLJc4MBov0
Any suggestions would be appreciated.