Rivera Primo SU Rebuild - Manual (Page 9)

A beautiful thing!! A rebuilt SU
Carburettor By Rivera Primo!
Install the proper weight Piston
Return Spring. (See Note).
Install Dome cap snugging it
up by hand only!
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103
98
101
100 99
Align all 3 holes, then fasten
Dome to body with 3 screws.
Spray a small amount of WD in
top of Dome onto the piston.
Position the Dome over the
spring & slide it down.
After securing the Dome, in-
sure that Piston moves freely.
The Dome can only be put on
one way for all 3 holes to align.
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102
NOTE: Piston Return Springs come in (3) different weights; 4 ounce, 8 ounce, and 12 ounce. The normal
configuration is with an 8 ounce spring. It may be necessary to change the spring to affect the idle mixture.
The 4 ounce is leaner and the 12 ounce is richer (in comparison to the 8 ounce spring). For instance, if you
have a shovel that is not idling properly due to insufficient fuel, you might put in a 12 oz spring.
RIVERA PRIMO INC.
12450 WHITTIER BLVD.
WHITTIER, CA 90602
562-907-2606 562-907-2606
www.riveraprimoinc.com ~ [email protected]