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I have ordered a Clymer's Service Manual for this model, but it has yet to arrive in the mail.
I've recently traded some work for an '81 GS850GLX that needs a small amount of work. It will crank and run, but initially gushed fuel out into the airbox while running. I pulled the entire carb-set and disassembled and cleaned thoroughly with M.E.K. and a fine wire and blew out with compressed air. Reassembled completely with Marvel Mystery? oil for initial lubrication. Reinstalled the carb-set and cranked right up again... still pumping fuel out the small air passage to the right side of the back (airbox end) of the intake of the carbs (all 4). After reassembly, I had plugged a pair of vent T's between the outer pairs of carbs on the advice of a supposed motorcycle carb expert. He claimed they were simply maintenance taps that should be capped during normal operation. After pouring quite an impressive quantity of $3.00/gallon fuel onto the ground outside my shop, I decided to uncap the vent T's. The leakage stopped. I can now crank and run the engine fairly smoothly with no leaks. I'm pretty sure however that the float levels aren't as accurate as they should be. There's a tiny shudder on first acceleration and a bit of an uneven exhaust note. I would greatly appreciate the float height specs on these Mikuni Kogyo C.V. Carbs and any specific suggestions that relate. Also, Can anyone give me an idea where those vent T's should be connected? It seems that maybe there should be a tube routing to the airbox or something of that nature, but until I have that manual in hand, I'm guessing. Right now, I have a 6" long hose attached to each vent T, standing straight up alongside the frame backbone. It works, but very inelegant.
I have ordered a Clymer's Service Manual for this model, but it has yet to arrive in the mail.I've recently traded some work for an '81 GS850GLX that needs a small amount of work. It will crank and run, but initially gushed fuel out into the airbox while running. I pulled the entire carb-set and disassembled and cleaned thoroughly with M.E.K. and a fine wire and blew out with compressed air. Reassembled completely with Marvel Mystery? oil for initial lubrication. Reinstalled the carb-set and cranked right up again... still pumping fuel out the small air passage to the right side of the back (airbox end) of the intake of the carbs (all 4). After reassembly, I had plugged a pair of vent T's between the outer pairs of carbs on the advice of a supposed motorcycle carb expert. He claimed they were simply maintenance taps that should be capped during normal operation. After pouring quite an impressive quantity of $3.00/gallon fuel onto the ground outside my shop, I decided to uncap the vent T's. The leakage stopped. I can now crank and run the engine fairly smoothly with no leaks. I'm pretty sure however that the float levels aren't as accurate as they should be. There's a tiny shudder on first acceleration and a bit of an uneven exhaust note. I would greatly appreciate the float height specs on these Mikuni Kogyo C.V. Carbs and any specific suggestions that relate. Also, Can anyone give me an idea where those vent T's should be connected? It seems that maybe there should be a tube routing to the airbox or something of that nature, but until I have that manual in hand, I'm guessing. Right now, I have a 6" long hose attached to each vent T, standing straight up alongside the frame backbone. It works, but very inelegant.
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