If the carb continues to under perform, remove the bowl and make another one to two jet sizing adjustment, either up or down based on your circumstances, until the engine runs well. Screw the new jet size into the jet mounts within the metering block, with a screwdriver or pair of pliers. If the air temp raises above 105 degrees, larger jets will be needed to increase the amount of fuel entering the combustion chamber, known as a "rich" condition. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Refer to the air/fuel recommendations of your engine's service manual. Unscrew the fuel bowl bolts with a wrench and pull the fuel bowl off the carburetor. Remove the jets and insert a smaller/larger set based on the vehicles operating altitude. Holley manufactures each carburetor with a set of jets that will allow the carburetor to perform well at sea level and around 70 degree air temperature.

How to Reset the Change Oil Light in a ... Hemera Technologies/AbleStock.com/Getty Images. NOTE – Advanced Options – You can just go with the default settings here as all motorcycles are factory set to run at sea level and at 20′ Celsius (68′ Fahrenheit). Test the engine to ensure the jet sizing change has compensated for the temp change, indicated by the engine running smooth during idle and crisp under acceleration. Replace the jets with a larger jet sizing by two to three sizes. For example, your current elevation is 2,000 feet above sea level with a temperature of 70 degrees. The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Holley Performace: Main Jet Adjustment Video Guide. Unscrew the jet(s) with a screwdriver of pair of pliers and adjust the jet size up or down one size, depending on your circumstances. 1 0 obj << /Type /Page /Parent 5 0 R /Resources << /ColorSpace << /CS5 49 0 R /CS6 14 0 R /CS3 49 0 R /CS4 14 0 R /CS0 49 0 R /CS1 14 0 R /CS2 25 0 R /Cs5 14 0 R /Cs10 25 0 R >> /ExtGState << /GS4 36 0 R /GS5 48 0 R >> /Font << /T1_4 13 0 R /T1_5 16 0 R >> /ProcSet [ /PDF /Text ] >> /Contents 92 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 5 0 obj << /Type /Pages /Kids [ 10 0 R 1 0 R ] /Count 2 >> endobj 6 0 obj << /CreationDate (D:20050513013049Z) /ModDate (D:20050513095733-07'00') /Producer (Acrobat Distiller 5.0.5 for Macintosh) /Author (Ellis O. Russelburg J.r.) /Creator (QuarkXPress.

Turn the engine on and test it by listening for a smooth idle and a crisp throttle response. If the altitude is dropped 2000 feet, you'll need to insert a jet that is one to two sizes larger than the current size, increasing the fuel flow to match the higher oxygen levels. I couldn't blow it … For example, a jet may be stamped (on its head) with the number 30. The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber.

Change the jets whenever you increase the performance characteristics of the engine. This larger jet sizing may foul your spark plugs, but that's better than burning up your pistons. This creates a lean condition that runs the engine hotter, ideal for cold conditions. .N�� �c.|��_���pn�}���pfNé!8�~� '��i�_/}}'}�>�Jc=��[�S�4�%����_KÝ�P���]��Jlԭb���Y|�R�{!�={�ĞF�m���L�~*t�o�����Bg��Q+�?^�m�B�C���o���/+�Q�?��7����ƻ|C)����6����=��Օpu7���\�u�QW�.���׸*u>[y�}p����V��f���-�Ė��L�][z�)�a�d3���[Y��,�$�)�`n�3�i�u��)22��ta Pull the bowl away from the carburetor, preserving the bowl gasket. Rich conditions allow the engine to operate at a cooler temp.

High numbers = rich. Install a smaller jet size if the ambient temperature dips below 35-degrees Fahrenheit. Needle letter denotes mixture below half-throttle. Adjust the jets one size for every 2,000 foot change in elevation or for every 35 degree change in temperature. : AdobePS 8.7.3 \(301\)) /Title (\(1\) 2005 H/W fuel layout) >> endobj 9 0 obj << /Type /Catalog /Pages 5 0 R /Metadata 94 0 R >> endobj 10 0 obj << /Type /Page /Parent 5 0 R /Resources << /ColorSpace << /CS6 49 0 R /CS7 14 0 R /CS8 25 0 R /CS3 49 0 R /CS4 14 0 R /CS5 25 0 R /CS0 49 0 R /CS1 14 0 R /CS2 25 0 R /Cs5 14 0 R /Cs10 25 0 R >> /ExtGState << /GS40 36 0 R /GS41 50 0 R /GS42 51 0 R /GS43 52 0 R /GS44 53 0 R /GS45 54 0 R /GS46 55 0 R /GS47 56 0 R /GS48 57 0 R /GS49 58 0 R /GS50 59 0 R /GS51 60 0 R /GS52 48 0 R /GS53 79 0 R /GS54 80 0 R /GS55 81 0 R /GS56 82 0 R /GS57 83 0 R /GS58 84 0 R /GS59 85 0 R >> /Font << /T1_8 16 0 R /T1_9 13 0 R /T1_10 28 0 R /T1_11 29 0 R >> /XObject << /Im10 41 0 R /Im11 42 0 R /Im12 43 0 R /Im13 44 0 R /Im14 40 0 R >> /ProcSet [ /PDF /Text /ImageB /ImageC ] >> /Contents 86 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 12 0 obj << /Type /FontDescriptor /Ascent 868 /CapHeight 754 /Descent -268 /Flags 32 /FontBBox [ -163 -268 1113 995 ] /FontName /Futura /ItalicAngle 0 /StemV 90 /XHeight 468 /StemH 84 >> endobj 13 0 obj << /Type /Font /Subtype /Type1 /FirstChar 32 /LastChar 213 /Widths [ 289 321 439 578 578 708 692 277 292 292 432 578 289 332 289 551 578 578 578 578 578 578 578 578 578 578 289 289 578 578 578 453 800 703 535 661 665 521 474 780 675 232 362 600 385 851 785 828 495 828 543 537 456 669 640 1027 574 573 552 311 551 311 578 500 360 556 556 441 556 488 275 555 523 254 254 462 222 767 523 540 556 556 351 384 240 512 445 718 489 484 495 334 570 334 578 289 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 578 578 0 0 0 0 0 800 0 0 0 289 0 0 289 578 289 289 0 512 289 289 289 289 289 0 0 289 0 0 0 0 0 289 0 289 289 0 0 0 289 0 0 0 0 0 500 0 439 439 0 277 ] /Encoding /MacRomanEncoding /BaseFont /Futura /FontDescriptor 12 0 R >> endobj 14 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 15 0 obj << /Type /FontDescriptor /Ascent 848 /CapHeight 754 /Descent -262 /Flags 262176 /FontBBox [ -148 -264 1178 1002 ] /FontName /Futura-Heavy /ItalicAngle 0 /StemV 140 /XHeight 491 /StemH 128 >> endobj 16 0 obj << /Type /Font /Subtype /Type1 /FirstChar 32 /LastChar 122 /Widths [ 289 325 488 578 578 772 702 296 271 271 417 578 289 330 289 539 578 578 578 578 578 578 578 578 578 578 289 289 578 578 578 487 975 676 553 601 646 488 463 739 674 254 389 620 402 836 759 782 528 782 558 526 451 660 639 977 623 587 575 288 539 288 578 500 380 565 565 421 565 501 303 562 540 253 253 526 239 802 540 548 565 565 367 410 274 535 488 783 549 520 481 ] /Encoding /WinAnsiEncoding /BaseFont /Futura-Heavy /FontDescriptor 15 0 R >> endobj 25 0 obj [ /Separation /PANTONE#20485#20CV 14 0 R 37 0 R ] endobj 28 0 obj << /Type /Font /Subtype /Type1 /Encoding /MacRomanEncoding /BaseFont /Helvetica >> endobj 29 0 obj << /Type /Font /Subtype /Type1 /Encoding /WinAnsiEncoding /BaseFont /Helvetica-Bold >> endobj 36 0 obj << /Type /ExtGState /SA false /SM 0.02 /TR /Identity >> endobj 37 0 obj << /FunctionType 0 /Domain [ 0 1 ] /Range [ 0 1 0 1 0 1 ] /BitsPerSample 8 /Size [ 255 ] /Length 749 /Filter /FlateDecode >> stream �[email protected]����:QkK��^�[email protected]��$��6��U{��aW[^�k\H�Z�>n�*x�\=~�ic��XQ�5����>H�?�_���vC_m6�o�w�����i�t_o�� J���o���*_Y�zU��덇I Ή.3�̴`���/�u{��\�7�k�V�>�z�}C�Z�Cw 5w?�f��e���9��Vg�l5�|Cuts��\��fK^�mO��a��鵬���]_�����8o��'��g�܆c�������靺�������b�^�^��M�:9���ԏ%�����D����#��zLq>��N�;��n��e��oiih ���t��� N��Y^>\�n�}͑�����^��~�������r��=��� vZ�������|� 2��2׼������Uy^�4���[k��t�X&.

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