High Altitude Carburetor Kits for Fixed Main Carburetors
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SERVICE
BULLETIN
110
INFORMATIONAL
ISSUED: |
May 1985 |
REVISED: July 1997
SUBJECT: High Altitude Carburetor Kits for Fixed Main Carburetors
Engines built to O.E.M. specifications may experience starting and operating problems when used in areas of the country where the altitude is four thousand feet above sea level or higher. A leaner fuel/air mixture is more desirable at higher elevations to sustain good engine startability and operating characteristics. Engines built with adjustable idle and main circuit carburetors can be adjusted (or fine tuned by adjusting).
The following will assist you in selecting the correct high altitude/leaner jetted bowl nut for engines equipped with fixed main or dual system carburetors. Order your requirements from your source of supply.
4 CYCLE
|
STANDARD BOWL/NUT |
|
ENGINE |
STAMPED |
Over 4,000 Ft. |
|
|
|
LEV115 |
Jet |
* |
64, 65, 75, 79, 103,- |
|
|
|
108, 126, 127, 137 |
632455 |
158, 161, 164, 165, 166, 171, 172, 177 |
632737 |
|
TVS90 |
124, 125,133, 135, 136 |
631026 |
OVM & OVXL120, |
120, 141 |
632239 |
Dellorto |
69 |
633017 |
VLV40, 50, 55, 60, 65, 66 |
Jet |
632648 |
VLV40, 50, 55, 60, 65, 66 |
Nozzle |
632638 |
83, 132 |
632239 |
|
TVM220 |
109, 131 |
631973 |
OHV15 - Walbro LMK26 |
Jet |
632688 |
OHV11 - 17 (Enduro) |
Jet |
* |
|
|
|
2 CYCLE |
|
|
|
STANDARD BOWL/NUT |
|
ENGINE |
STAMPED |
Over 4,000 Ft. |
AH/AV520 & 600, HSK600 |
101 |
632368 |
TVS/TVXL840 |
L118, L119 |
632463 |
HSK840, 845, 850/HXL840 |
124, 125 |
631026 |
TC200/TC300 Tillotson carburetor only. |
Jet |
632940 |
TC200/TC300 Tillotson HU112 and HU114 |
Jet |
N/A |
|
|
|
Do Not install leaner jetted bowl nuts on engines used below four thousand feet as starting and operating problems will occur. WARRANTY DOES NOT APPLY.
NOTE: Engines which are identified as compliant with CARB (California Air Resources Board) or EPA (US Environmental Protection Agency) regulations can NOT be changed from the factory unless specifically authorized.
* Altitude compensation not required due to use of emissions type carburetors.