Extended network

Koso Four Valve Head Kit — Honda Grom/Monkey

Koso · #0950-0755 · Top End / Engine

Ideal engine part to complete Koso's big bore kit
Unique four-valve design increases air flow and performance
Provides more power and torque
Features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves
Proper exhaust system must be used to prevent re-flow pressure and heat.

$869.85

Not in stock right now — special order. Order it now and we email the ship date before we charge you a cent.

Questions? Call the shop: 801-361-3010

Real shop · real humans · 1231 N 1300 W Ste A, Centerville, UT 84014

Shop all Koso
Everything we carry from Koso →

Description & features5 features

Only fits Koso 170 cc big bore kit.

Ideal engine part to complete Koso's big bore kit
Unique four-valve design increases air flow and performance
Provides more power and torque
Features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves
Proper exhaust system must be used to prevent re-flow pressure and heat.

Specifications12 specs

Engine Type: 4-Stroke
Displacement: 170 cc
Style: Big Bore
Material: Stainless Steel
Compression Ratio: 12.3:1
Features: Head Kit Only
Riding Style: Street
Units: Kit
Type: 4 Valve
Shipping weight: 6.61 lb
Package size: 12.3 × 9.3 × 6.8 in
Country of origin: Taiwan

Fitment5 models · Honda

Honda5 models

Grom 1252014–2020
Grom 125 ABS2018–2020
Monkey2019–2021
Monkey ABS2019–2021
MSX125 Grom SF2017–2018

Fitment comes from the catalog data for this part. Double-check your year, model and trim before you order — or call the counter at 801-361-3010 and we’ll check it with you.

Part numbers

Salto part #: 0950-0755
Koso part #: MC623000

Shipping

Special order. We email the ship date when you order.

Ground shipping is $14.95, free on orders over $150. Stock is checked again before your card is charged.

Questions4 answers

Is it in stock?: It isn’t in stock right now, but we can special-order it. We confirm timing by email when you order, before anything is charged.
How fast will it get to me?: We confirm the ship date when you order. If anything changes, you hear it from us first.
Will it fit my machine?: It’s listed for the models in the Fitment section above. Not sure about your trim or year? Call the counter at 801-361-3010 and we’ll check it with you.
Is this genuine Koso?: Yes. It’s new and genuine, straight from Salto — Koso part #MC623000.