Differences

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--- tecnica:motori:honda_ntv650_carburetor [2024/09/23 12:22] – [Fuel and breather pipes placement] niccolo
+++ tecnica:motori:honda_ntv650_carburetor [2024/10/29 10:14] (current) – [Replacing the diaphragms at 100.000 and 200.000 km] niccolo
@@ Line 1: / Line 1: @@
 ====== Honda NTV650 Revere - Carburetor ======
-The Honda NTV650 Revere mounts two **Keihin** vacuum piston carburetors. Each carburetor has also an **air cut-off valve** driven by a small membrane.
+The Honda NTV650 Revere mounts two **Keihin** vacuum piston carburetors. When servicing the carburetors, it must be kept in mind that in addition to the **vacuum piston diaphragm**, there is also a small diaphragm that operates the **air cut-off valve**.
 Here it is my experience in **replacing the diaphragms** and some information on the little-known **air cut-off valve**.
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 As soon as they were mounted, the result seemed good: the precision and sensitivity of the throttle was significantly improved compared to the old cracked membranes. In a few months I will check the actual seal of the membrane and especially of the glue. The one supplied reports among its characteristics a maximum operating temperature of 80 °C. Probably the Loctite 454 has better characteristics.
-In the following picture you can see the mounting position of the diaphragm, seen from below:
+In the following picture you can see the mounting position of the diaphragm. You can see the angle with the vertical axis measuerd on the top cover and a view of the piston from below:
-{{.:honda_ntv650:diaphragm-position.jpg?200|Diaphragm original position}}
+{{.:honda_ntv650:carburetor-diaphragm-alignment.png?240|Diaphragm alignment}}
+{{.:honda_ntv650:diaphragm-position.jpg?240|Diaphragm original position}}
 ===== Jets and pilot screw =====
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 {{.:honda_ntv650:ntv650-revere-carburetor-rear-bottom.jpg?200|}}
 {{.:honda_ntv650:ntv650-revere-carburetor-rear-top.jpg?200|}}
+===== Carburetors synchronization =====
+Remove tha tank and connect two vacuum gauges to the cylinders intakes using two joints plugs (Honda part 16214-MB0-000). Provide the fuel in some way, warm up the engine and adjust the idle speed (1100 +/- 100 rpm). The difference in vacuum reading should be 40 mm Hg or less.
+If necessary, synchronize to the specification by turning the synchronization adjusting screw: screwing-in by **turning clockwise will increase the idle of the rear cylinder**.
+{{.:honda_ntv650:sync-carb-ntv650-a.png?direct&280|Carburetors synchronization: Plug}}
+{{.:honda_ntv650:sync-carb-ntv650-b.png?direct&280|Carburetors synchronization: Joint plug}}
+{{.:honda_ntv650:sync-carb-ntv650-c.png?direct&280|Carburetors synchronization: Adjusting screw}}
 ===== The air cut off valve =====