Rivera Primo Mikuni 42mm Carb - SH & XL - Manual (Page 8)

adjusting; however, if a problem has been diagnosed as a
fuel level that is too high or too low, adjustment can be
done as shown in Fig. 10.
AIR FILTER SERVICE INSTRUCTIONS
A. PRE-CLEANING: Tap the element to dislodge any large
embedded dirt, then gently brush with a soft bristle brush.
B. PAN CLEANING: Soak or roll element in a large shallow
pan of K&N air filter cleaner (1/4 the depth of 1 pleat). Remove
immediately and let it sit for approximately 10 minutes.
C. RINSE OFF: Rinse off the element with low pressure water,
tap water is OK. Always flush from the inside of the filter out.
This removes the dirt and does not drive it into the filter.
IMPORTANT: Air dry only.
D. OILING: After the filter has dried always re-oil before using.
Apply K&N air filter oil with one pass per pleat. Wait 10 minutes
and reoil any white spots still showing. IMPORTANT: Do not
use gasoline or cleaning solvent to service the filter element as
this will damage the filter.
FLOAT LEVEL ADJUSTMENTS
A. Invert the carburetor and remove the float bowl.
B. Float assembly's actuator tab should just begin contact with
the Needle Valve assembly when the bottom of the float is 19
± 1.5mm from the carburetor bottom surface.
C. If adjustment is required, adjust by bending the actuator tab.
NOTE: Extreme care should be used whenever removing the float
pin; the pin is a "press fit" into the support bosses. If you must
remove the pin for any reason, use caution to prevent breakage of the
support bosses.
SHOVELHEAD/IRON HEAD XL
Installation Instructions
8
12450 Whittier Blvd., Whittier, CA 90602 Tel:(562) 907-2600 Fax:(562) 907-2606
the pilot jet and pilot air jet may be incorrect. If the softness is
more pronounced when the engine is at normal running tem-
perature, install a larger (leaner) pilot air jet. If there is minor
coughing or "popping" through the carburetor when the engine
is cool, install a smaller (richer) pilot air jet.
After you have changed the pilot air jet, you will need to re-
adjust the mixture screw. If the new mixture screw adjustment
is outside the one to three turn range, change the pilot jet. If the
mixture screws give idle at more than three turns, install the
next larger (richer) pilot jet. If, on the other hand, correct idle
requires less than one turn, fit the next smaller pilot jet.
It is unlikely that changing the pilot jet will have an adverse
effect on the pilot air jet requirement.
GENERAL MAINTENANCE
MIKUNI HSR42 CARBURETOR
There are very few moving parts in the HSR Series carburetor.
This carburetor will not require much servicing, but there are a
few items to be mentioned to assure good performance sea-
son after season.
A.If the motorcycle is to be stored for any length of time the
carburetor float bowl should be drained.
B.The float bowl drain plug should be removed periodically and
cleaned of any sediment that may have settled during
long periods of use.
C. DO NOT drill or modify any part of this carburetor for any
reason as the result will surely be more problems. Refer to
TROUBLE-SHOOTING (GENERAL) or TROUBLE-SHOOT-
ING (JETTING) to correct any problems that you may have.
D. If a jet or passage does become plugged, use only carbu-
retor cleaner and compressed air. DO NOT push a drill or any
other object through the jet or passage to clean them.
E. If the air filter is dirty and requires servicing, follow these
steps. Typical service is done after about 20,000 miles.
F. The Fuel Level in the carburetor will probably never need
To order a current
Rivera Primo
catalog please call
800-872-1515
GENERAL WARRANTY
Rivera Primo Inc.’s sole obligation and the customer’s sole remedy is limited to replacement or repair of products free of
charge in the event products fail to perform as warranted for a period of one year from actual date of purchase. Proof of
purchase must accompany any warranty claim. In no event shall Rivera Primo Inc. be liable for claims for any other dam-
ages, whether direct, incidental, foreseeable, consequential, or special (including but not limited to loss of use, revenue or
profit), whether based upon warranty, contract, tort (including negligence) or strict liability arising in connection with the
sale or the failure of Rivera Primo Inc. products to perform in accordance with the stated specifications.
Rivera Primo Inc. makes no other warranty of any kind whatsoever, and specifically disclaims and excludes all other war-
ranties of any kind or nature whatsoever, directly or indirectly, express or implied, including, without limitation, as to the
suitabilitly, productivity, durability, fitness for a particular purpose or use, merchantability, condition, or any other matter
with respect to Rivera Primo Inc. products.