Kitaco has replaced the Ultra SE head with the higher flow SE Pro and SE2 Pro line of cylinder heads and bore kits for XR100R CRF100F Ape 100 and NSF 100. Completely redesigned intake port makes the SE2 Pro the new standard for race engines and pushes available power over 16HP. 145cc SE2 Pro kit comes with:

• ceramic coated, all aluminum cylinder kit

• forged 57mm high compression piston with WPC and Mos2 treatment
  

• 56.50mm stroker crankshaft

• Ultra SE high lift camshaft IN 20/50 EX 50/20 (optional SE-R camshaft sold separate)

• all required installation gaskets

• SD cam chain

• ultralight 6.0 gram retainers with WPC treatment (optional titanium retainers at 3.4 grams sold separate)

• SE2 rocker arm set, 20% lighter than oem