Instruction manual

Engine Model: Briggs & Stratton
Classic,
450 and 500 Series
Page
19 of 32 B&S Classic, 450 and 500 Series Selfhelp Guide 2011, Issue 1.0
B: Replacing the Primer Bulb:
The red rubber button may perish, or mice may chew holes in this part when the
machine is stored over winter in a shed. The item is considered as a consumable
item, and therefore not covered by warranty.
The part number (including its retaining clip) is 694394. The item is called a
Carburettor Primer.
A service dealer considers this as a chargeable job and NOT a warranty repair.
If you are of a mechanical or practical nature you can buy the part from a local
parts/service dealer.
Using the instructions and diagrams in A above, and remembering to work
cleanly and not introduce dirt when carrying out this procedure:
1. Remove the carburettor and fuel tank, and separate the carburettor and
fuel tank as described above.
2. Slide the jet screen off the carburettor body. Please note, the fixed main
jet is not a serviceable part.
3. Press in from both sides of the primer bulb cavity to release the retainer
tabs.
4. Prise the retainer out and remove the primer bulb.
5. Replace the primer button by reversing the above instructions, and then
reassemble.
IMPORTANT: Do not stretch, bend or compress the primer spring.