Joined: 01 Sep 2003
|Posted: Thu Feb 05, 2009 8:00 pm Post subject: YAMAHA 400cc Engine & Carb Repair
|This is a pic of the Yamaha 400cc from the XS400RJ owners manual
YAMAHA 400cc CARB REPAIR...... by Don Sucha
Our Pulse #246 has a 1982 Yamaha XS400RJ dual overhead cam engine. The earlier Yamaha 400SJ is the single overhead cam engine.
There are no carb kits as such that I know of, but individual parts are available from your local Yamaha dealer. My local Yamaha dealer quoted the following prices in 2008:
Needle & seat $79.94, Float $35.23, Gasket kit $7.87, Throttle slide / vacuum diaphram assy $190.00, Rubber crab mounting isolator boot [carb to cylinder head] $55.64, [the carb boot is available only for 1 side but can be turned over upside down for the other side]. Carb isolator 0-ring, $6.01
Remember you have 2 carbs.....so these prices times two. Prices seem to vary from dealer to dealer.
You don't really need a carb kit anyway, usually the carbs just need a real good cleaning with carb cleaner and compressed air. Be careful not to get the carb cleaner on any rubber parts, diaphrams or gaskets. Pay special attention to the cold enrichment jet [choke jet] and passages because the jet is very small and is hard to clean. It is often plugged from stale gas leading to hard starting when cold. Sometimes several attempts to clean this jet are required.
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