The_Stache
Been Around the Block
Re: '76 RD400c -- 2smoker "Ginger"
Waiting on some advice in getting rid of this chugging when i close the throttle. To reiterate: Jetting is all stock save for the 120 main jet and the needle at 2. The problem occurs when I let out the throttle while cruising. It only happens below 4,000 rpm. Above that she's relatively smooth. Below 2,700 rpm (in high gear, which I don't usually do) she is also relatively smooth. It is quite violent at speed.
I'm thinking of going down one size on main jet to stock 115. Was also thinking of going up one size to 27.5 pilot. I've read RD's are notoriously lean at closed - 1/4 throttle. I'm going to reset air screw/idle tomorrow using the jetting guide posted earlier to verify that I need a larger pilot.
Any suggestions would be greatly appreciated.
Waiting on some advice in getting rid of this chugging when i close the throttle. To reiterate: Jetting is all stock save for the 120 main jet and the needle at 2. The problem occurs when I let out the throttle while cruising. It only happens below 4,000 rpm. Above that she's relatively smooth. Below 2,700 rpm (in high gear, which I don't usually do) she is also relatively smooth. It is quite violent at speed.
I'm thinking of going down one size on main jet to stock 115. Was also thinking of going up one size to 27.5 pilot. I've read RD's are notoriously lean at closed - 1/4 throttle. I'm going to reset air screw/idle tomorrow using the jetting guide posted earlier to verify that I need a larger pilot.
Any suggestions would be greatly appreciated.