CJR Race Head comes updated for a big improvement in low-mid range performance with added combustion chamber work, revised port shape, and more!

Unleash your build with the new CRF110F Race Head! One of the biggest restrictions we find with the 19+ CRF110F is the intake and exhaust port along with the OEM valve springs. With the new race head, you can bring up to +20% to +30% more power (varies for different build specs) through the entire rpm range and an increased RPM limit with top-end power that keeps pulling strong. Recommended for stock bore up to 147cc big bore kits. Depending on the camshaft, expect to retain good low RPM performance with a strong increase in mid-high rpm power and more available overrev.

This cylinder head comes updated with new features and is fully assembled (Excludes rocker arms/tappets)

Improved Polished Combustion Chamber Design
Eliminate the Valve shroud for increased flow
Ported/Polished intake and exhaust port with removed guides for increased flow
22mm Intake Port to allow the use of 24mm and 26mm Throttle Body Kits
22mm Exhaust Port to pair with smaller and larger exhaust systems
Lightweight Retainers
Upgraded HD Valve Springs safe to 12,000rpm (11,000rpm recommended for most exhaust, 12k+ only with a larger 30-34mm throttle body and large exhaust (Yoshimura/Rocket Big Bore/Bill's Big Bore)
Machined Spring Seat to allow the largest camshaft profiles available
Stock valve size to improve low-end response and increase long-term reliability, OEM replacement valves available at any Honda dealer

CJR Performance 28/24 Big Valve Race Head. This cylinder head comes fully assembled (Excludes rocker arms/tappets). Recommended for larger builds 132cc-173cc. Depending on the camshaft, expect a slight loss in low RPM performance with a drastic increase in mid-high rpm power and more available overrev.

Improved Polished Combustion Chamber Design
28/24 Big Valve with revised valve angle
Eliminate Valve shroud for increased flow
Ported/Polished intake and exhaust port with removed guides for increased flow
25mm Intake Port
25mm Exhaust Port
Upgraded HD Valve Springs tested safely to 11,000rpm
Machined Spring Seat to allow the largest camshaft profiles available

NOTE for 28/24 Head-
- Recommended to be used with 30-25mm or 34mm-25mm throttle body kit.
- Recommended to be used with a larger diameter exhaust,, Yoshimura, Rocket Big Bore, Bills Big Bore
- Recommended to be used with high lift camshaft (CJR S2, Decha 5.5, DCR)
- Currently Requires aRacer Standalone ECU, CJR ECU Flashes are currently in testing

*DUE TO THIS PRODUCT BEING USED AS A RACE ITEM, THIS PRODUCT DOES NOT OFFER A WARRANTY - FOR RACE COMPETITION USE ONLY
NO RETURNS

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