Keihin 31mm Large Throttle Body Kit Honda Grom 125

Keihin 31mm Large Throttle Body Kit Honda Grom 125

SKU #: KHN-1002
Complete upgrade! Keihin 31mm throttle body and manifold kit for Honda Grom 125! Comes included with large 31mm Keihin throttle body (with all sensors attached), matching intake manifold, clocking plate, injector housing, manifold insulator, adapter harness, and o-rings! This is a must for big bore engines!
$400.00 In stock


Availability: In stock

Keihin 31mm Throttle kit for Honda Grom 125! Highly recommended for those with 180+cc big bore kits! This throttle body is a true 31mm size, not a bore out OEM stock throttle body where the throttle fly is still the same size! Match this with your high performance race head or head work to get the best results!




31mm Throttle Body Kit Content:

  • -Keihin 31mm Throttle Body
  • -Matching intake manifold
  • -Matching rubble coupler with clamps
  • -Aluminum manifold Clocking Plate
  • -Fuel Injector Housing
  • -O-Rings
  • -Thermal Insulator Plate
  • -TPS and Idle Sensors included (already attached)
  • -Harness adapter that allows everything to work with OEM ECU


Note: Throttle body O.D. is 45mm, exisiting air filters or intakes will not fit this throttle body.  




For those with an stock USDM throttle body laying around, we offer store credit of $60 if you would like to send them in! Please send it to the provide address below! Be sure to include your contact information (name, phone #, email) so that we could contact you and send you a voucher for the store credit. Throttle body must be in good working order and undamaged.

Voucher does not expire and it could be used anytime! It's non-transferrable.

  • Steady Garage
  • 861 Meridian St
  • Irwindale, CA 91010



This product is legal for closed-course compeition use only; for racing vehicles (a compeition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways.