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tecnica:motori:honda_ntv650_carburetor [2025/12/22 17:15] – [Repair kits] niccolotecnica:motori:honda_ntv650_carburetor [2026/04/08 22:34] (current) – [Problem with the Keyster valve seat] niccolo
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 It seems that also the Keyster kit **K-976EK** is compatibile with the NTV650 Revere, it contains fewer parts, but it contains the same rubber parts as the **KH-1348** kit, plus the oval O-ring of the air cut-off valve. Another kit from Keyster is the **K139** (also labeled **NTMOR-007G**), which includes only the float chamber gasket. It seems that also the Keyster kit **K-976EK** is compatibile with the NTV650 Revere, it contains fewer parts, but it contains the same rubber parts as the **KH-1348** kit, plus the oval O-ring of the air cut-off valve. Another kit from Keyster is the **K139** (also labeled **NTMOR-007G**), which includes only the float chamber gasket.
 +
 +===== Problem with the Keyster valve seat =====
 +
 +After overhauling the carburetors with the Keyster kit, I had **a problem with the float valve seat**. Even though I had adjusted the float level according to the manual (9.2 mm), after driving for a few kilometers, the fuel began dripping from the carburetor vent tube. Evidently the valve wasn't closing, and **the float chamber was overfilling**.
 +
 +To confirm that the fuel level was the problem, I connected two clear rubber hoses to the carburetor drains. The hoses were then bent upward, above the fuel cap. By loosening the **drain screws** of the carburetors, you can see the fuel level in the hose, which will be equal to the level in the float chamber. After a few kilometers of driving, I confirmed that the level in one of the two carburetors had risen several centimeters and was now reaching the breather pipe.
 +
 +{{.:honda_ntv650:keihin-carburetor-inspecting-fuel-level-in-float-chamber.jpg?direct&400|Inspecting the fuel level in float chamber}}
 +
 +When I removed the carburetor, I noticed that **the Keyster replacement had different dimensions than the original**, both the valve seat and the washer. To be safe, I reassembled the originals, and the problem was solved.
 +
 +{{.:honda_ntv650:keihin-carburetor-valve-seat.jpg?direct&400|}}
 +
 +{{.:honda_ntv650:keihin-valve-seat-honda-original.jpg?direct&280|}}
 +{{.:honda_ntv650:keihin-valve-seat-keyster-replacement.jpg?direct&280|}}
 +{{.:honda_ntv650:keihin-valve-seat-washer-honda-original.jpg?direct&280|}}
 +{{.:honda_ntv650:keihin-valve-seat-washer-keyster-replacement.jpg?direct&280|}}
  
 ===== Do not use red paste gasket sealant! ===== ===== Do not use red paste gasket sealant! =====
tecnica/motori/honda_ntv650_carburetor.1766420123.txt.gz · Last modified: by niccolo