Good afternoon comrades,
The BINGS on my R100/7 were long overdue for a rebuild. RT cylinder was fouling plugs and also wouldn't respond to mixture screw adjustments. Not to mention the overall "nast" of both carbs.
So I ordered the rebuild kit and started the adventure for the 1st time.
Other than receiving not-matching jet needles with those that were in the carbs before (the new ones were longer -- which begs the question, was I shipped the incorrect ones or was I running incorrect ones this whole time? a paradox), the rebuild went very smoothly.
When looking at a carb off the bike (throttle cables not attached), in re: to the throttle stop screw, butterfly position, and the two tiny holes in the venturi: Butterfly fully closed, the two holes are not visible. Couple of turns in of the stop screw and the 1st hole is visible. Where should the butterfly be positioned in relation to these two holes at rest/idle?
I guesstimated the above, finished the rebuild. Threw the carbs back onto the bike.
The right side carb now responds very well to adjustments.
Dang...the left side does not respond to mixture screw adjustments.
I'll lean the left all the way in and the cyl doesn't even complain, chugs away as if it wasn't leaned out at all.
So fuel is leaking in somewhere internally. Took the carb off, took it apart, compressed air, reassembled, back on the bike, not better, took the carb off, took it apart, rinse wash repeat 3X.
If the mixture screw does not affect the cylinder, and the o-ring is intact and correctly placed, and the spring and mixture screw seem to be OK, what could be the culprit. I suppose a quick check is to switch the RT side mix screw with the LT side one, and see if the problem changes. But lets say that doesn't change anything. Where could fuel be seeping in from?
Thanks for your time.