Specifications Hign-concerned Chemical:None Item Length:0inch Displacement (ml):250 No. of Cylinders:4 Cylinder Special Features:Direct replacements for the original parts Item Diameter:0inch Item Weight:330g Item Height:0inch Item Width:0inch External Testing Certification:iso9001 Model Name:CRF 250 R CRF250 X L 14711-KRN-670 14721-KRN-670 Brand Name:Road Passion Item Type:engines Material:Strength Steel Intake CODE:14711-KRN-670 Exhaust CODE:14721-KRN-670 We focus on the production of various types of motorcycle accessories, from tiny parts to large and heavy parts that can be purchased and used. Symptoms of motorcycle valve loosening: 1. As long as the valve clearance is not suitable, it can be adjusted at any time. Generally, it can be adjusted once. 2. Formal adjustment requires a feeler gauge to measure. Generally, the valve clearance is different depending on the model, the clearance is about 0.05-0.08, and the scooter can be larger 3. The valve clearance must be adjusted to normal. Too large or too small is not good, and it cannot be adjusted to increase or decrease artificially. Too large or small has only shortcomings and no advantages. 4. The valve clearance must be adjusted when the car is cold. The valve clearance will change when the car is hot, and it should be subject to the cold state. If you feel the power drops and the idle speed is unstable after the adjustment , the gap should be adjusted down, and you should adjust it in time. Brand name RoadPassion Product type Intake Exhaust Stem Valve Guide Seal Material Stainless steel Condition Direct replacements for the original parts Quantity 1 Pair / 2 Pairs Fit For HONDA: CRF250R 2004-2009 CRF250X 2004-217 CRF250L 2004-2009