Question about 1978 Moto Guzzi V 50 I

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How do I adjust a Mikuni roundslide carb. Thanks

How do I adjust a Mikuni roundslide carb. The Engine starts but won't stay runding. Plus it bougs when I open the throllel. I screwed in the Idel adjustment screw. Thanks Steve

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Turn the air screw and the throttle screw inward until they LIGHTLY seat. Now turn each of them outward one and one half turns. This is the factory setting. You might want to clean the carbs. After cleaning, before you put the slide back into the carb, move the clip on the jet needle downward one notch. This will richen the fuel mix and help with the bog.

Posted on Dec 11, 2009

Testimonial: "Thanks for your help. Steve"

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Mikuni bs32ss doing a carb sync. Where to attach vacuum hose and which screw to adjust. Even the "manual" doesn't identify which screw or where to attach hose. Pictures would be nice. Thanks


Each carb has a small vacuum port on the side above the float bowl, you adjust the idle stop screw to set the tune and sync the carbs. Leave the air fuel mixture screws alone.

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I need to know the proper tuning of ucal mikuni carburetor with mixture adjusting screw on bottom of cabr (beneath float bowl), an idle adjust screw and pilot screw (hopefully pilot fuel screw since s


Why did you need to clean the carb? Routine servicing of the aircleaner would keep the carb clean for life. The pilot screw should be 1.5 turns out approx. with a small adjustment either way. Idle speed is set to a smooth low idle.If this doesn't fix it have you got something in the carb not replaced correctly? The float needle/float assy? How did you clean it? Have you introduced fluff/dirt into the carb and did you blow it clean with an airline?

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94 1340 with a mikuni carb that has recenly been rebuilt it will only stay running with the choke pulled. Give it gas it dies let go of the choke it dies. I need to know where to start looking .


I'd start looking at whoever rebuilt the carb. To begin with, this is not the original carb that came on the bike. It came with a Keihin CV type carb. But the symptoms you are describing sound like you are not getting any fuel through the slow speed circuit. The choke you are talking about is actually an enricher circuit if the Mikuni is a Screamin' Eagle carb or one of the flat side carbs made for a Harley-Davidson engine. The enricher circuit has it's own fuel metering system. It mixes fuel and air that the engine runs on when the engine is cold. The mixture is very rich as well. But when you crack the throttle the least bit, the air that the engine draws in comes in through the main venturi instead of the enricher circuit. If there is no fuel or not enough fuel in that air stream, the mixture is too lean for the engine to run and it dies. If the carb had not been "rebuilt", I'd say that the jets were stopped up or that the accelerator pump is not working.

Good Luck
Steve

Jun 17, 2011 | Harley Davidson FXDWG Dyna Wide Glide...

1 Answer

Carb adjusting


get the bike started, hold the engine at a high idle. while holding the idle high, adjust the air fuel mixture screw until it sounds smooth. rev it up a few times and see if the engine is "snappier". let it return to an idle, then adjust the idle screw. it may take a few tries to get it right, just listen to the engine.. if this dont work, you may consider re-jetting the carb. hope this helps...

Apr 25, 2009 | 2003 Suzuki RM 125

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