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

*

TVS90-120/ECV90,100/TNT100

64, 65, 75, 79, 103,-

 

 

108, 126, 127, 137

632455

TVS90-120 / OHH50 / 55

158, 161, 164, 165, 166, 171, 172, 177

632737

TVS90 -120, OVRM40-60

124, 125,133, 135, 136

631026

OVM & OVXL120, OHV11-13 (Formula)

120, 141

632239

Dellorto

69

633017

VLV40, 50, 55, 60, 65, 66

Jet

632648

VLV40, 50, 55, 60, 65, 66

Nozzle

632638

TVM170-195

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.



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