91 ST1100. Carb drain screws

[Craig_st1100]

I was wondering if someone could post a clear pic of where to locate the drain screws. I must be staring right at the right place or I just can't see them. Maybe with a circle around the spot. I just got this bike in May and it stumbles up around the 80 mph mark. Till then it runs super.

I have changed the plugs, resealed the gas tank, after a thorough cleaning, replaced the fuel pump with the airtex (recommended by you guys) and the fuel filter also adding in theHonda stabilizer.

I also read that the installed K & N air filter may be letting too much air in which may be causing the problem. I was going to go get a Fram filter recommended on this site and see of that helps.

Any other suggestions.

 

[Mark]

1) The K&N does not cause any issues with stumbling as long as you have taken the foam cover off and thrown it away.
2) A stumble late in the rpm could mean torn diaphragms. I haven't seen them myself; but, from what I have read your issue sounds the same.
3) https://www.st-owners.com/forums/showthread.php?107836-ST1100-carb-drain-screws has a picture you can download and expand.

 

[DeanR]

Those screws are hard to find even when you know where they are and have loosened em before. The picture in Marks link shows the location. I have a 9 inch straight head screwdriver that just barely makes it back in there. You have to angle it in just right and probably need a flashlight.

 

[Brant]

I was wondering if someone could post a clear pic of where to locate the drain screws. I must be staring right at the right place or I just can't see them. Maybe with a circle around the spot. I just got this bike in May and it stumbles up around the 80 mph mark. Till then it runs super.

I have changed the plugs, resealed the gas tank, after a thorough cleaning, replaced the fuel pump with the airtex (recommended by you guys) and the fuel filter also adding in theHonda stabilizer.

I also read that the installed K & N air filter may be letting too much air in which may be causing the problem. I was going to go get a Fram filter recommended on this site and see of that helps.

Any other suggestions.

IMO, would'nt compund the issue with guessing. The paper Fram have heard to be too restictive, which would affect vacuum diaphrams operation, making any stumble worse in this case.

 

[Brant]

IMO, would'nt compund the issue with guessing. The paper Fram have heard to be too restictive, which would affect vacuum diaphrams operation, making any stumble worse in this case.

+1 on the foam if its a K&N or that style. Loose the foam and make sure filter is clean. IMO, you got a rich conditon, not a lean cond. One thing at a time!...... and float levels are unlikely an issue if carbs haven't been off previously. No offense, but can't be skipping around trying different things at once or you'll chase your tail a LONG time before getting corrected.