SOURCE: setting float level on HSC40 Hitachi carburetors on 1986 Virago
I have a 1982 Virago 750 that I just did a carb rebuild to. To set the float levels I built a jig from wood that simulates the position of the carbs when mounted on the bike. This jig clamps into my bench vise. I created a fuel supply using a small funnel and a piece of fuel hose mounted above the level of the carbs.. After that all you need is a short length of transparent fuel hose to attach to the drain on the bottom of the float bowl to provide the visual indication of the float setting. Now you are ready to set up the float levels on your bench. This is way easier than trying to set them up in the bike.
Make sure that the jig is set up so that the carbs sit as level as possible across the pair and that they sit as close to the natural position in the bike in the lengthwise position when the bike is sitting level.
The process of setting up these floats can be very tedious, be patient. It may require that the float bowls be removed multiple times to get it correct (I replaced the philips head machine screws with allen head screws to make this easier). Printed instructions for the procedure look for a certain fuel level setting plus or minus 1mm. This kind of tolerance can be quite difficult to get when the only adjustment you have to work with is to bend the metal tang on the float assembly.
SOURCE: just need the height setting for the floats the
YOU CAN ADJUST FLOATS WITHOUT SPECIAL TOOLS. ALL YOU NEED IS A FOOT LONG PIECE OF CLEAR TUBING, SIZED TO FIT THE BOWL DRAIN. SET FLOATS AS CLOSE TO WHAT THEY WERE WHEN YOU REPLACED IT. INSTALL THE BOWL AND PUT THE TUBE ON THE DRAIN. OPEN THE BOWL DRAIN SCREW WHILE HOLDING THE TUBE UP BESIDE THE CARB. WHEN YOU GET THE TUBE BESIDE THE CARB ASSY., THE GAS IN THE TUBE SHOWS YOU THE EXACT LEVEL OF FUEL IN THE BOWL. FROM THIS YOU CAN MAKE ANY ADJUSTMENTS NECESSARY FOR CORRECT LEVEL. THE LEVEL SHOULD BE RIGHT BELOW THE PLANE WHERE THE BOWL MEETS THE CARB BASE.
SOURCE: carbs leaking
Oh yes they do! They have two separate floats and the cause of this is usually some dirt has blocked the needle valve assembly and will require a cleaning. sound like the carb needs cleaning or needle and seat is wore out. One guy I know was able to fix his without removing carbs by adding 2 ounces of Marvels Mystery Oil found at wal mart. Allow a few days to work.
SOURCE: twin mikuni carb adjustment
You can make a duel carb sync tool for about $2
Here is a link to a walkthrough for making the sync tool
CARB SYNC TOOL
Here is a link to a walkthrough for doing the carb sync
CARB SYNCHRONIZATION
Don't worry about the air-fuel mixture. It doesn't need to get adjusted.
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