I worked with a dealer/rental outlet in the service dept for several years.
I traded my time for free parts for my R&D projects and access to factory service information.
Diaphragms are a replacement part.I serviced engines made by every major manufacturer no one covers replacement parts.
Diaphragms are cheap and take 5 min with only a screw driver needed to replace them, I don't see what the big issue is.
Following is warrenty information if you need further information contact information is supplied at the bottom so you can embarass yourself with Honda directly.
Warranty
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Warranty conditions - Exclusions
The following items are disallowed from coverage by the warranty
1. Common
A. Any damage which results from neglect of the periodic maintenance specified by Honda.
B. Any damage which results from repair or maintenance operations by methods other than specified by Honda.
C. Any product which has participated in a racing event, rally or competition.
D. Any damage which results from misuse or use beyond the limitations or the intended purpose specified by Honda, such as overloading, or any damage due to use under abnormal conditions.
E. Any damage which results from use of non-genuine parts, lubricant or fluid not approved by Honda.
F. Any damage resulting from modification or installation in other products in a way not approved by Honda which has any influence on the function and/or performance of the products.
G. Any damage which results from operation other than specified in the Owner's Manual, either intentionally or by error.
H. Fading of painted surfaces, deterioration of plated surfaces, deterioration of rubber and plastics, and rusting due to the passage of time.
I. Normal phenomena such as noise, vibration or oil seepage which are considered by Honda as not affecting the quality, function or performance of the product.
J. Any damage due to improper storage or transport.
K. Expendable replacement items.
Carburetor diaphragms are considered an expendable replacement item
Examples
Expendable replacement parts: Spark plugs, contact points, shear pins, fuel strainers, oil filter elements, air cleaner elements, brake shoes, clutch discs, fuses, motor brushes, gaskets, packings, tubes, belts.
Petroleum products and others: Oil, grease, battery electrolyte, radiator coolant. Other items specified by Honda.
L. Periodical maintenance items such as cleaning, inspection and adjustments.
M. Any repair and/or adjustment performed by persons other than a distributor or his authorised dealers, or damage resulting therefrom. As a rule, warranty shall not be applied to repair or adjustment performed by persons other than a distributor or his authorised dealers. However, in case of an unavoidable emergency, repair or adjustment may be carried out by other persons and, when judged by the distributor. as being proper, the distributor will be compensated for the cost of adjustment in accordance with the procedure for a normal warranty claim if the claim is approved by Honda.
N. Any repair and/or adjustment to correct improper or poor quality work previously performed.
O. Incidental expenses incurred in the warranty claim.
Examples
Additional expenses such as those for towing, communications, hotel and meals, etc., incurred due to breakdown of the product at a remote location.
Any expense related to personal injury and/or property damage (exclusive of the product itself).
Compensation for time loss, commercial losses or rental costs of a substitute product during the period of adjustment.
P. Any damage which results from unavoidable natural disasters, fire, collision, theft, etc.
Q. Any normal wear or deterioration, such as that of sliding and/or rotating parts caused under normal operating conditions. Examples o Normal wear to pistons, piston rings, cylinders, piston pins, valve seats, stems and bearings.
R. Any trouble or damage caused by soot, smoke medicines chemicals salt or the like.
2. Engines
A. Any defect on Engines caused by improper installation in other products.
Examples
Any damage resulting from vibration caused by improper installation.
Any defect caused by mishandling and/or incorrect matching of the OEM engine and product in which it is installed as described in the OEM Technical Manual for OEM engines.
B. Any expense related to installation or removal of OEM engine from product in which it is installed for repair.
C. Normal expendable replacement parts:
Examples
Spark plugs, contact points, shear pins, fuel strainers, air cleaner elements, oil filter elements, starter motor brushes, gaskets, packings, V-belts.
D. Any defect caused by improper maintenance and/or use.
Examples
Bend or break in the crankshaft caused by external shock.
Any defect caused by use other than specified by Honda.
Malfunctioning engine due to use of improper fuel. .
Cylinder seizure caused by overheat.
E. The injection nozzle of a diesel engine (including tip), of which the warranty period is one year except for the following countries.
Examples
In countries where the warranty period granted to the distributor for the product is less than one year, the warranty period so specified shall take precedence.
F. Any cost or damage resulting from overhaul of any sealed units or parts which Honda instructs should not be disassembled
Examples
Sealing of the governor
Sealing of the engine stop lever disassembling the injection pump/nozzle
G. Others correspond to the common category of exclusions
Copyright, 2012 , Honda All rights reserved.
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I worked with a dealer/rental outlet in the service dept for several years.Diaphragms are a replacement part.
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When you write or call, please provide this information:
Equipment manufacturer's name and model number that the
engine is mounted on
Name of dealer who sold the engine to you
Name, address, and contact person of the dealer who services
your engine
Date of purchase
Your name, address and telephone number
A detailed description of the problem
Power Equipment Division
Customer Relations Office
4900 Marconi Drive
Alpharetta, GA 30005-8847