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Sherco Carb Jetting
Instructions
This manual provides instructions on how to remove and reinstall the
stock carburetor, it also shows you how to change the pilot jet and
the main jet. It is intended to be used for all Sherco 1.25 – 2.9 Trials
Motorcycles.
The motorcycle shown is a new 2002, 2.9, the one that you are
working on may be slightly different but the principles shown will
apply to all of the models indicated.
The technician shown in the photographs is David Chaves who
received his training at the Sherco factory in Spain. David is also a
member of Team Sherco and is competing in the NATC national
series as a Champ rider.
The stock jets are: Pilot 30 – 33, Main 124 – 126.
Sherco USA recommends a 36 pilot and a 118 main for most North
American applications. Altitude, temperature and atmospheric
conditions all have an effect on carburetion. Your local dealer should
be able to advise you as to the best jetting for your area.
The float height should be set at 18.5mm.
If you have any question or are not certain about any procedure call
Ryan Young Products on 1-800-607-8742.
1/15/2004
Sherco Carb Jetting
1
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Summary of Contents for SHERCO Carb Jetting
- Page 1 This manual provides instructions on how to remove and reinstall the stock carburetor, it also shows you how to change the pilot jet and the main jet. It is intended to be used for all Sherco 1.25 – 2.9 Trials Motorcycles.
- Page 2 The First Step is to Remove the Rear Fender. Remove the 2 rear fender mounting bolts. Remove the front mounting Disconnect the taillight bolt. harness. 1/15/2004 Sherco Carb Jetting...
- Page 3 The Second Step is to Remove the Fuel Tank Remove the top fuel tank mounting bolt and disconnect the fuel overflow line and the fuel line. Remove the airbox by removing the 3 mounting screws. 1/15/2004 Sherco Carb Jetting...
- Page 4 Air Box Removal Continued Notice that David is loosening the rear clamp, the one that attaches the air box to the rubber manifold. Do not loosen the clamp that attaches the rubber manifold to the carburetor. 1/15/2004 Sherco Carb Jetting...
- Page 5 To facilitate the removal of the air box remove the fender retaining nut. Remove the air box and set it aside. 1/15/2004 Sherco Carb Jetting...
- Page 6 Slide Removal Loosen the 2 screws that retain the carb slide, remove it and set it aside. David hangs it over the side of the frame as shown. 1/15/2004 Sherco Carb Jetting...
- Page 7 Loosen the manifold clamp at the carburetor. Remove the carburetor from the frame as shown. 1/15/2004 Sherco Carb Jetting...
- Page 8 Changing the Jets Set the carburetor on a clean surface. Use a 14 mm wrench and remove the main jet holder. 1/15/2004 Sherco Carb Jetting...
- Page 9 Main Jet Main jet holder Set the float bowl upright as shown in order to keep the floats from falling out of the bowl. 1/15/2004 Sherco Carb Jetting...
- Page 10 The pilot jet is located in the body of the carburetor as shown, to change it use a straight screw driver that fits it tight, remove it and replace it with the appropriate one for your conditions. 1/15/2004 Sherco Carb Jetting...
- Page 11 Replacing the Float Bowl Notice how David holds the carburetor body and the float bowl, this method insures that the floats do not fall out of the bowl. Install and tighten the main jet holder. 1/15/2004 Sherco Carb Jetting...
- Page 12 The jets are changed and the carburetor is ready to be reinstalled. For the most part the assembly process is just the disassembly reversed. We will make note of a few things that David does to make the job go smoother. 1/15/2004 Sherco Carb Jetting...
- Page 13 Carburetor Installation Tips David routes the fuel line under the engine breather line as shown. 1/15/2004 Sherco Carb Jetting...
- Page 14 Install the carb as shown. 1/15/2004 Sherco Carb Jetting...
- Page 15 Reinstall the slide, look to make sure that it is installed properly. David operates the throttle and makes sure that the slide is operating properly. This is CRITICAL, take your time and do this right. 1/15/2004 Sherco Carb Jetting...
- Page 16 David installs the air box and the fuel tank before he tightens the carburetor clamps. He does this so that he can rotate the carburetor in order to provide operating clearance for the choke lever. 1/15/2004 Sherco Carb Jetting...
- Page 17 Rotate the carburetor so that the choke lever operates properly. Now tighten the manifold clamps. 1/15/2004 Sherco Carb Jetting...
- Page 18 Turning the idle screw in (clockwise), increases the idle speed, turning it out decreases the idle speed. Turning the “GAS” screw out (counter clockwise) makes the idle mixture richer and turning it in makes it leaner. 1/15/2004 Sherco Carb Jetting...
- Page 19 Tighten all the bolts, connect the fuel lines, install the rear fender and the bike is ready to be test ridden. If you have any questions or are not certain about any procedure call Ryan Young Products on 1-800-607- 8742. 1/15/2004 Sherco Carb Jetting...