KOSO Performance 170cc 4V Big Bore Kit (MB623003)
Fits ’13-’20 Honda GROM / GROM SF – PREMIUM GAS
‘MUST Use with Premium Gas
Requires a Fuel Controller & A/F Monitor (sold Separately) for Proper fueling.
Its Highly recommended to run a 16t or 17t Front Sprocket with this BBK
To keep the revs in the Power Band
• 170cc ceramic coated cylinder
• forged piston
• performance camshaft
• camshaft bearing
• rocker arms
• 4 valve cylinder head
• intake manifold & gaskets
Requires a Fuel Controller & A/F Monitor (sold Separately) for Proper fueling see also Below Recommended Parts
- NGK ER9EH
- PCX150 Injector
- KOSO 34mm Throttle Body
- ARacer RCmini 5 Engine Management ECU Honda Grom Monkey 125cc (All Years )
- ARacer AF1 for Auto Tune
- ARacer 1 to 2 Splitter or 1 to 4 Cable to add components
- Koso Cam Chain Tensioner
- Koso High Flow Oil Pump
- NCY Decompression Tube
** This BBK uses a smaller 8mm Spark Plug, we highly recommend adding to your order.
** Kit should be installed by a certified mechanic to ensure proper function. Improper installation could result in catastrophic engine failure.
** Highly Recommended To install Temp. Gauge and A/F Monitor to ensure proper running Temperatures and Add Longevity to the Motor.