21
High Altitude Jetting 4,000 Feet and Over
Changing Nozzle Jet for High Altitude Applications
Modifi cation Procedure:
On the bottom of the carburetor bowl, there is a large hex nut. Unscrew the
nut and pull off the bowl. Where the nut was unscrewed, the nozzle jet will be visible.
Take the proper
fl
at head screwdriver and carefully insert up the hole and unscrew the
jet. The best screwdriver to remove the jet is a multi type screwdriver. Use a small pair
of vise grips to remove the loosened jet. Be careful as the jet is brass. Carefully remove
only the jet as other parts above the jet might fall out. Insert the new jet and screw it
back into bottom of the hole. Do not over-tighten the jet, only get it seated snugly.
Replace the fuel bowl and the nut in the bottom center and tighten.
Note: Use a small mirror and place it under the carburetor to see the jet and also make sure that the fuel bowl is
aligned properly. The fuel bowl may hang up on the fl ange of the aluminum carburetor casting and not properly
seat on the gasket that sits between the fuel bowl and carburetor casting.
When everything is properly positioned, turn on the gas and check for leaks. If there are leaks it is likely that
the fuel bowl is not aligned properly to seat on the gasket. Recheck the fuel bowl alignment with gasket to avoid
carburetor casting. Loosen the center nut and move fuel bowl around to seat properly on the gasket only and
retighten nut.
Note: there is also a small gasket between the fuel bowl and the large hex nut. Don’t misplace it and make sure
it’s in place when you reinstall the nut or it will leak.
Boliy USA
6800 Otter Lake Road
Lino Lakes, MN 55038-4428
651-407-1457
Part number:
BOLYE17
