750 Weber woes - same same but different?
Posted: Fri Apr 14, 2017 5:55 am
Hi All,
I picked up a yellow 87 a couple years ago and got it going after some neglect from the PO. I haven't ridden it much (I have a bit of a stable that I cycle through) but would like to move this guy to the front of the herd.
Running a 44 DCNF carb (jet info below) with stock exhaust and intake with K&N air filter.
I've tried to do my due diligence and search for every issue possible on the site, but here's a rundown of what's happening.
-Starts up okay (except after sitting for a while).
-Inconsistent idle, even when screw is in to make it idle a little too high - after a throttle blip, it stumbles and dies. "inconsistent" meaning sometimes it just chugs along at idle, but most of the time it tails off and dies. I'm uploading a video now.
-Float is right at 46mm, double checked.
-Pulled jets, cleaned carb - everything is squeaky
-There's a bit of fuel under each gasket (trumpets and float bowl/top). Leak?
When riding, it bogs mid-full throttle and dies without a little throttle at stop lights.
I pulled the float again today to check, still at 46. Reading up on jets and the info varies all over the place. I can't find a definitive where's what for jets and mixture screws on this carb. I figured some jet experimentation is due, but I can't find a good source for jets (I usually go to jetsrus.com, but they have nada for Webers). UNLESS I'm looking at the wrong things that I'm calling jets. The sizes I have don't jive with what I can find - what I thought was the jet looks more like an emulsion tube. See pic below.
Questions:
Is there a diagram with the right labels, so I know what I'm referring to?
Am I reading the wrong sizes? The only jet I can find is in sizes 20-50 or so - mine says 145 on the tube and 170 F44 on the jet. What I thought was the Etube says 110 F7.
I expect a certain amount of PITA from my Italians, but these fairings are getting to be too much to take on and off for tweaking, hoping to just get this big banana going. Thanks in advance.
IMG_9549 by Andrew Taylor, on Flickr
I picked up a yellow 87 a couple years ago and got it going after some neglect from the PO. I haven't ridden it much (I have a bit of a stable that I cycle through) but would like to move this guy to the front of the herd.
Running a 44 DCNF carb (jet info below) with stock exhaust and intake with K&N air filter.
I've tried to do my due diligence and search for every issue possible on the site, but here's a rundown of what's happening.
-Starts up okay (except after sitting for a while).
-Inconsistent idle, even when screw is in to make it idle a little too high - after a throttle blip, it stumbles and dies. "inconsistent" meaning sometimes it just chugs along at idle, but most of the time it tails off and dies. I'm uploading a video now.
-Float is right at 46mm, double checked.
-Pulled jets, cleaned carb - everything is squeaky
-There's a bit of fuel under each gasket (trumpets and float bowl/top). Leak?
When riding, it bogs mid-full throttle and dies without a little throttle at stop lights.
I pulled the float again today to check, still at 46. Reading up on jets and the info varies all over the place. I can't find a definitive where's what for jets and mixture screws on this carb. I figured some jet experimentation is due, but I can't find a good source for jets (I usually go to jetsrus.com, but they have nada for Webers). UNLESS I'm looking at the wrong things that I'm calling jets. The sizes I have don't jive with what I can find - what I thought was the jet looks more like an emulsion tube. See pic below.
Questions:
Is there a diagram with the right labels, so I know what I'm referring to?
Am I reading the wrong sizes? The only jet I can find is in sizes 20-50 or so - mine says 145 on the tube and 170 F44 on the jet. What I thought was the Etube says 110 F7.
I expect a certain amount of PITA from my Italians, but these fairings are getting to be too much to take on and off for tweaking, hoping to just get this big banana going. Thanks in advance.
IMG_9549 by Andrew Taylor, on Flickr