Number of valves	Size of valves	Valve Area	Bore	Bore Area	aV:aB Ratio	Stroke	Displacement	aV:cc Ratio	Bore:Stroke Ratio	Notes
2	19	2268.16	57	10206.73	0.2222	38	96.96	2.34	1.5				19mm intake, 3.6mm in between intake valves
2	20.5	2640.43	57	10206.73	0.2587	38	96.96	2.72	1.5
2	21	2770.8	60	11309.4	0.2450	41.4	117.05	2.37	1.45
2	22	3040.97	60	11309.4	0.2689	41.4	117.05	2.6	1.45
1	27	2290.15	60	11309.4	0.2025	41.4	117.05	1.96	1.45
1	28	2462.94	60	11309.4	0.2178	41.4	117.05	2.1	1.45
1	29	2642	60	11309.4	0.2336	41.4	117.05	2.26	1.45
1	30	2827.35	60	11309.4	0.2500	41.4	117.05	2.42	1.45
1	31	3018.98	60	11309.4	0.2669	41.4	117.05	2.58	1.45
2	25	3926.88	61	11689.52	0.3359	41.4	120.99	3.25	1.47
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2	36	8142.77	96	28952.06	0.2813	62.1	449.48	1.81	1.55	Honda CRF450r
2	30	5654.7	72	16285.54	0.3472	45	183.21	3.09	1.6	2000 GSX-R 750
2	36	8142.77	98	30170.97	0.2699	66	497.82	1.64	1.48	Ducati 996
1	28.5	2551.68	54	9160.61	0.2785	54	123.67	2.06	1	Takegawa 124 +R
2	21	2770.8	54	9160.61	0.3025	52	119.09	2.33	1.04	Daytona 119 DOHC
1	27	2290.15	52.4	8625.81	0.2655	55.5	119.68	1.91	0.94	Lifan Pro Mini
2	19	2268.16	52.4	8625.81	0.2630	49.5	106.74	2.12	1.06	SDG 107
1	23	1661.85	47	6939.57	0.2395	41.4	71.82	2.31	1.14	Honda CRF70
1	19	1134.08	39	4778.22	0.2373	41.4	49.45	2.29	0.94	Honda CRF50
2		0	74	17202.85	0.0000	57.3	246.43	0	1.29	Honda TRX 250X
2		0	56.5	10028.45	0.0000	49.5	124.1	0	1.14	Lifan 156FMI-D	http://www.lifan.com/en/showproduct.asp?id=5349
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