Author Topic: Echo 590  (Read 4501 times)

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Offline sharkey

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Re: cs-590 wolf review. bone stock.
« on: April 24, 2014, 09:49:00 am »
Here are a couple pics of this 600p with the V-stack and Uni sock filter. 

The HDA-66 on there now is a little larger.  Dimensions for the HDA-66 are: Choke Bore 22.20mm, Venturi 15.88mm and Throttle Bore 19mm.  Original HDA-268 is 19mm Choke Bore, 15.08 Venturi, and 19mm throttle bore.  The 590/600p uses the longer resonance tuning of the air box with the smaller choke bore of the HDA-268.  Take your air box all the way off and look at it from where it attaches to the carb.  All together it looks to be about 4 inches in length.  I havent done the calculations on the intake, Im just trying different carbs to see if there are any benefits that jump out at me.         

When you had your carb apart and the metering diaphragm off, did you notice the feed hole in the main nozzle base?  Semi-fixed H jet at .058mm.  It will feed fuel directly from the metering chamber no matter where you have your H twist jet set at.  Should only flow when vacuum is high though.  I dont think its a bad idea, just there for warranty purposes I suppose.  Can plug it if you want to.  Usually these Walbro carbs will flow plenty of fuel, its getting enough air to burn that fuel that matters.     
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