drdano
XS650 Enthusiast
SOLOVED!. BS34 Choke (Enricher) not raising RPMs ?
Hello folks. I have an interesting situation with a pair of BS34 carbs. My '83 year model had a pair of earlier BS34's on it with the hand type choke that I used to learn a bit about tuning, jetting and synchronizing. Ran fantastic with these and were a great set of carbs I've torn down dozens of times through the past few years.
Ok, so the OEM correct carbs were rebuilt that have a cable type choke, everything cleaned out, inspected, etc. I pulled my jets from my other pair of carbs, and the bike runs exactly as before performance wise. The problem I have now, is that when I use more than about 1/4 of the choke travel the motor seems to be flooding out rich. Even with 1/4 choke, it absolutely will not start. If I raise the RPMs manually with a clip to get it near 1500 RPMs and no choke, it will start. The RPMs also never raise in that 1/4 choke once the motor is running, it just seems to richen out and die. I've pulled these carbs a half dozen times, checked the pressed in jet in the bowl, checked the pipe from the bowl to the enricher up top, everything seems clear. I even swapped the plungers from my old carbs to these ones with no difference.
What am I missing here? I feel like there is something stupid going on here (likely operator error) that I'm missing that is going to make these carbs just as good as my other set. Thanks all!
Hello folks. I have an interesting situation with a pair of BS34 carbs. My '83 year model had a pair of earlier BS34's on it with the hand type choke that I used to learn a bit about tuning, jetting and synchronizing. Ran fantastic with these and were a great set of carbs I've torn down dozens of times through the past few years.
Ok, so the OEM correct carbs were rebuilt that have a cable type choke, everything cleaned out, inspected, etc. I pulled my jets from my other pair of carbs, and the bike runs exactly as before performance wise. The problem I have now, is that when I use more than about 1/4 of the choke travel the motor seems to be flooding out rich. Even with 1/4 choke, it absolutely will not start. If I raise the RPMs manually with a clip to get it near 1500 RPMs and no choke, it will start. The RPMs also never raise in that 1/4 choke once the motor is running, it just seems to richen out and die. I've pulled these carbs a half dozen times, checked the pressed in jet in the bowl, checked the pipe from the bowl to the enricher up top, everything seems clear. I even swapped the plungers from my old carbs to these ones with no difference.
What am I missing here? I feel like there is something stupid going on here (likely operator error) that I'm missing that is going to make these carbs just as good as my other set. Thanks all!
Last edited:
