Koso 34mm Throttle Body / Manifold Kit

Name: Koso 34mm Throttle Body / Manifold Kit
Brand: Koso North America
Price: 168.0 USD
Availability: InStock

$168.00

by Koso North America

Size

Throttle Body Only Manifold Only Throttle Body and Manifold Combo

Quantity

The throttle body and intake manifold are used to control the amount of air flowing to the engine’s combustion chamber, they are important elements of the admission system. Using our Koso’s 34 mm throttle body in conjunction with our 30.5 to 34mm intake manifold will allow a better air/fuel mixtures for a quicker throttle response.

***Fits 2022 model only when using the AvailMS Adapter Here: https://www.dhmotoring.com/products/availmskosoadapter

***DHM does not provide ECU flashing services for most setups with this throttle body kit. Please inquire if you are planning on using an ECU flash prior to purchasing. We recommend the aRacer MiniX and AF2 combo for most setups when using this throttle body kit.

2026 Honda Grom 149cc big bore kit

I own a 2026 Honda Grom and went with the 149 cc big bore kit from DHM. I paired it with the ported cylinder head and S1 cam shaft from DHM. We also added the Koso 34mm throttlebody, intake, and Yoshimura RS9-T Stainless Full Exhaust. To keep things cool I added a stout oil cooler along with the Kitaco Super Oil Pump. For a little safety a Speed Shop Roller Bearing Tensioner Arm was added getting rid of that OEM plastic wheel that could potentially fail. An upgraded clutch was a must. I installed an ultralight DHM lifter plate, sex machine, six disk race plate disc upgrade- with 80% stiffer clutch springs. The ECU tune David developed is spot on! We double the horsepower, with a great broad linear torque pull to red. The bikes equipped with Ohlins suspension front & rear, plus a Brembo RCS 15 front brake master cylinder to handle the breaking duty. Don't waste your time on an upgraded caliper and rotor without touching your master cylinder,, big mistake! The pull is powerful but progressive, you'll love it! Overall, I'm extremely happy with the DHM's modifications. David was great to talk to. If I needed anything, he was a phone call away. Unlike some motorcycle industry, he actually answers his phone too! I would definitely go back, as well as refer friends! Nice job David👍

Throttle body kit

No troubles with the kit the bike runs good with a149 big bore kit and stock cylinder head. Soon I will have it with a ported head and I will be done with the build. David has given me great guidance and support throughout the whole process.

Product looks great. Currently installed. But note, realized you will need the koso grom injector adapt kit DB623000 from partzilla if yor guna run the koso high flow injector DB008160

Great improvement over stock

The Avail MS 2022+ Grom Intake Manifold Adapter is needed to clock the injector a few degrees & I had to run the chimera intake to the left side of the bike

Questions

Haven't installed yet as, I am awaiting other parts. Is this tune good with stock injector and the same plugs as the hi-comp 125 kit? cpr9ea I believe

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Koso 34mm Throttle Body / Manifold Kit

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