Hammerhead Jet, Main Jet for Keihin-Style 125cc / 150cc, GY6 / 250cc Carburetors

Keihin style main jet for most 150cc and 250cc carburetors used on scooters and buggies.
As low as $3.49 was $4.99
Availability: In stock
SKU
mainjet_hhpwd

Frequently bought together

  1. Hammerhead Jet, Main Jet for Keihin-Style 125cc / 150cc, GY6 / 250cc Carburetors
  2. +
  3. Hammerhead Manual Choke Kit for 150cc, GY6 - 150manualchokekit replaces 15563, 15439
  4. +
  5. UNI Filter 2-Stage Angle Pod Air Filter, 55mm I.D. X 102mm Length - UP-4200AST
  6. +
  7. Hammerhead Jet, Pilot Jet for Keihin-Style 125cc / 150cc, GY6 / 250cc Carburetors
  8. +
  9. Hammerhead Intake Elbow for 28mm - 32mm Carburetors and 2" UNI Filter
  10. +
  11. Hammerhead Carburetor with Manual Choke, 24mm for GY6, 150cc - 13-1601-00 replaces 15856, 6.000.024, PD24J, PD24J00150G000, 14197, 16100-KAT-913-1, 16100-KAT-913, 14925
  12. +
  13. Hammerhead Carburetor 30mm, Electric Choke for 250cc - 172MM-100000 replaces BR250-464, KB002020000, 1610A-SCC0-0000, GK-19-250-03-32, GK-19-250-03-30, GK-06-250-3-25, DN250-337
  14. +
  15. UNI Filter Foam Filter, Oil & Filter Cleaner Kit - UFM-400
  16. +
  17. Hammerhead Performance Intake / Velocity Stack for 150cc, GY6 - INTAKE-150
  18. +
  19. Hammerhead Jet Kit, 16-Piece Jet Kit for Keihin-Style 125cc / 150cc, GY6 / 250cc Carburetors
Total price: $0.00

Thumbnail Name Price Options
$3.49
$44.99
$16.99
$3.99
$19.99
$89.99
$89.99
$17.99
$44.99
$19.99
Jet - Pilot Jet Size 45   + $0.00
Jet - Pilot Jet Size 42   + $0.00
Jet - Pilot Jet Size 40   + $0.00
Jet - Pilot Jet Size 38   + $0.00
Jet - Pilot Jet Size 35   + $0.00
Jet - Main Jet Size 140   + $0.00
Jet - Main Jet Size 138   + $0.00
Jet - Main Jet Size 135   + $0.00
Jet - Main Jet Size 132   + $0.00
Jet - Main Jet Size 130   + $0.00
Jet - Main Jet Size 128   + $0.00
Jet - Main Jet Size 125   + $0.00
Jet - Main Jet Size 122   + $0.00
Jet - Main Jet Size 120   + $0.00
Jet - Main Jet Size 115   + $0.00
Jet - Main Jet Size 112   + $0.00
Total Selected Items:
Total price: $0.00

The main jet controls the volume of fuel delivery in your carburetor from a little less than 1/2 throttle to wide open. 

If you've upgraded your carburetor, air intake, or exhaust, you will find you're running leaner. A larger main jet can help restore the correct air/fuel ratio in your system. 

Most stock carburetors come with a main jet between 108 and 115. With a UNI filter upgrade, most systems will need a main jet between 120 and 130, depending on your elevation and vehicle setup. If upgrading the air intake and exhaust, you'll need between 125 and 140 and possibly larger depending on your carburetor, exhaust, and riding location. 

You should test various jets until you reach the correct air/fuel ratio when idling and at full throttle. 

More Information
Price $2.49
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