Tweet
Hey Webs,
Back to basics. FIRST, we need to be sure of what bike you have. In the MISC forum/tips there's a thread you can check your VIN# against to verify what you have. Be sure your engine and frame have the same #'s, engines get swapped alot!
Next, IF it is a 79 with 79 carbs, you've removed the main and pilot jets. Do you remember removing a screw from on top of the pilot jet tower? The pilots feed from the MAIN thru a sharing tunnel, so the pilot tower is to be capped.
Next, the float height is 25.7mm + 1mm, from carb gasket surface. Does it have the brass floats? Did you replace the float valves and seats? If you didn't, inspect the valve tip, if you see a groove in it, it's worn and needs replaced. You can polish the seat. You can also do a mod to get the newer styled rubber tipped float needle valves, will need to replace the valve seats with the ones for the XV920 IIRC, recent threads about that will clarify that detail. The newer valves tend to get stuck in the older style seats, the XV920 uses the screw in style vs. the newer XS uses a press in style, so it won't work with the older carbs.
Next, did you separate the carbs from the bank holder? IF not, then you need to explore and clean out the UPPER "T" fittings, ensure that you can get AIR thru them, they are the bowl vents, and IF CLOGGED, will cause the carbs to flood!! Inspect the ports on your airbox, they also clog with fuel/oil vapor and debris, check the hoses to the nipples as well!! And check that float for leaks! Also, new bowl gaskets sometimes stick out into the carb body and can cause the float to hang up on them, check and trim as needed. Also, when the carbs are empty, when filling them, the floats can hang up from dropping so low, and a simple rap on the carb with a rubber mallet can shake them loose and get them floating properly!
Instead of bread stick tie, use the 3 ports in the upper carb throat, and ensure that when the butterflies are almost closed, that they partially cover/close the last of the 3 holes, this is a better bench synch. But yes, you will need to vacuum synch them. But you may want to check your valves first, because IF you need to change them, you will change the air flow, and will need to resynch them afterwards!!
Yeah, pickup coil wires is another must check and fix, then verify that you are hitting on all 4 spark wise, then you can get the carbs tuned in!
Back to basics. FIRST, we need to be sure of what bike you have. In the MISC forum/tips there's a thread you can check your VIN# against to verify what you have. Be sure your engine and frame have the same #'s, engines get swapped alot!
Next, IF it is a 79 with 79 carbs, you've removed the main and pilot jets. Do you remember removing a screw from on top of the pilot jet tower? The pilots feed from the MAIN thru a sharing tunnel, so the pilot tower is to be capped.
Next, the float height is 25.7mm + 1mm, from carb gasket surface. Does it have the brass floats? Did you replace the float valves and seats? If you didn't, inspect the valve tip, if you see a groove in it, it's worn and needs replaced. You can polish the seat. You can also do a mod to get the newer styled rubber tipped float needle valves, will need to replace the valve seats with the ones for the XV920 IIRC, recent threads about that will clarify that detail. The newer valves tend to get stuck in the older style seats, the XV920 uses the screw in style vs. the newer XS uses a press in style, so it won't work with the older carbs.
Next, did you separate the carbs from the bank holder? IF not, then you need to explore and clean out the UPPER "T" fittings, ensure that you can get AIR thru them, they are the bowl vents, and IF CLOGGED, will cause the carbs to flood!! Inspect the ports on your airbox, they also clog with fuel/oil vapor and debris, check the hoses to the nipples as well!! And check that float for leaks! Also, new bowl gaskets sometimes stick out into the carb body and can cause the float to hang up on them, check and trim as needed. Also, when the carbs are empty, when filling them, the floats can hang up from dropping so low, and a simple rap on the carb with a rubber mallet can shake them loose and get them floating properly!
Instead of bread stick tie, use the 3 ports in the upper carb throat, and ensure that when the butterflies are almost closed, that they partially cover/close the last of the 3 holes, this is a better bench synch. But yes, you will need to vacuum synch them. But you may want to check your valves first, because IF you need to change them, you will change the air flow, and will need to resynch them afterwards!!
Yeah, pickup coil wires is another must check and fix, then verify that you are hitting on all 4 spark wise, then you can get the carbs tuned in!
Comment