See full version: Rochester H, HV Carburetor Adjustments
Unloader
Hold throttle valve wide open and move choke valve toward closed position until contact made at unloader tang. Check choke valve opening by inserting gauge of correct size between lower edge of valve and air horn wall. Adjust by bending unloader tang on throttle lever. Setting: .510″ here
Pump Rod
Back out the idle speed screw until the throttle valve is completely closed, then bend pump rod as necessary to align index mark on upper pump lever with sharp edge of air horn casting.
Automatic Choke
This adjustment must be made with carburetors installed on engine. With choke valve completely closed, pull choke rod upward to end of travel. Bottom of rod should be even with top of hole in choke lever. Adjust by turning rod in or out as required. Careful – Rotate vertical section of rod, do not crank rod by turning offset portion. here
Choke Rod
Position fast idle tang on second step of fast idle cam and against shoulder of highest step, close the valve so that trip lever on choke shaft just contacts choke tang on lever and collar assembly. Check choke valve opening by inserting gauge of correct size between lower edge of valve and air horn wall. Adjust by bending tang on trip lever up or down as required. Setting: .190 here
Float Drop
With the air horn upright so that floats hang freely, measure from the gasket surface to the bottom of float at toe or free end. Set by bending the tang at rear of float arm. here
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i recently got a rochester 2 barrel to replace the mercarb that was on my 2000 reinell 3.0. are the tuning/adjustment procedures any different than they were with the mercarb?
Re: rochester 2 barrel adjustment
Re: rochester 2 barrel adjustment
The primary & secondary disc position, the idle by-pass adjustment and mixture screw must all be adjusted exactly to manufacturers specs for this carby to perform at its best. Unfortunately in most cases the first thing to get incorrectly adjusted is the low speed screw which changes the throttle disc position in the bore and this has a roll on effect with the other adjustments. [links]
Anti run-on solenoid. (23) Its function is to ensure the engine stops when turned off at the ignition key. On late model vehicles with higher idle speeds this item is required, otherwise the engine may kick over with pre-ignition for a little bit after switch off. There are two types of anti run-on solenoids. here
Common faults with these were:
If a very thick compressible base gasket is used under these carbs, DO NOT over tighten the base nuts as this will result in cracking the carby base, but generally a bakerlite plate is used with thin gaskets on either side. [links]
There are various other linkage adjustments that need to be checked and corrected. It is best to get the specific workshop manual for your vehicle to accomplish this. If the throttle shafts have lateral movement then have them replaced.