Bore	Stroke
	Kawasaki	56	50.6
	Honda	54	54.5
	Yamaha YZ125	56	50.6
			Port Height (mm below top of cylinder)				Port Opening (ATDC)
	Year	Model	Main Exhaust	A x-fer	B x-fer	Boost	Main Exhaust	A x-fer	B x-fer	Boost		Following Port Delay
	1988	KR-1	29	39	39	40	91.5°	116.5°	116.5°	119.4°	24.96	0.0	2.89
	1992	RS125	28.1	42.1	42.1	42.3	84.3°	116.0°	116.0°	116.5°	31.75	0.0	0.50
	1994	RS125	28	41.5	42	42.5	84.0°	114.5°	115.8°	117.0°	30.50	1.3	1.25
		RS250	27.1	41.3	42.4	43	82.3°	114.0°	116.8°	118.5°	31.75	2.8	1.75
	1995	RS125	28.1	41.5	42.3	42.8	84.3°	114.5°	116.5°	118.0°	30.25	2.0	1.50
		RS250	27.1	41.3	42.4	43	82.3°	114.0°	116.8°	118.5°	31.75	2.8	1.75
	1996	RS125	28.1	41.5	42.3	42.8	84.3°	114.5°	116.5°	118.0°	30.25	2.0	1.50
		RS250	27.1	41.3	42.4	43	82.3°	114.0°	116.8°	118.5°	31.75	2.8	1.75
	1997	RS125	27.2	41.2	42.2	42.7	82.5°	113.8°	116.3°	117.8°	31.25	2.5	1.50
		RS250	27	41.5	42.5	43	82.0°	114.5°	117.0°	118.5°	32.50	2.5	1.50
	1998	RS125	27.2	41.2	42.2	42.7	82.5°	113.8°	116.3°	117.8°	31.25	2.5	1.50
		RS250	27	41.5	42.5	43	82.0°	114.5°	117.0°	118.5°	32.50	2.5	1.50
	1999	RS125	27.2	41.2	42.2	42.7	82.5°	113.8°	116.3°	117.8°	31.25	2.5	1.50
		RS250	27	41.5	42.5	43	82.0°	114.5°	117.0°	118.5°	32.50	2.5	1.50
	xxxx	KR-1x	25	38	39	39.5	82.5°	113.5°	116.3°	117.8°	31.00	2.8	1.50
	vlookup 50.6		vlookup 54.5
	24.6	81.5°	25.5	79.0°
	24.7	81.8°	25.5	79.0°
	24.8	82.0°	25.5	79.0°
	24.9	82.3°	25.5	79.0°
	25	82.5°	25.5	79.0°
	25.1	82.8°	25.5	79.0°
	25.2	82.8°	25.5	79.0°
	25.3	83.0°	25.5	79.0°
	25.4	83.3°	25.5	79.0°
	25.5	83.5°	25.5	79.0°
	25.6	83.8°	25.6	79.3°
	25.7	84.0°	25.7	79.5°
	25.8	84.3°	25.8	79.5°
	25.9	84.5°	25.9	79.8°
	26	84.8°	26	80.0°
	26.1	84.8°	26.1	80.3°
	26.2	85.0°	26.2	80.5°
	26.3	85.3°	26.3	80.5°
	26.4	85.5°	26.4	80.8°
	26.5	85.8°	26.5	81.0°
	26.6	86.0°	26.6	81.3°
	26.7	86.3°	26.7	81.5°
	26.7	86.3°	26.7	81.5°
	26.9	86.8°	26.9	81.8°
	27	86.8°	27	82.0°
	27.1	87.0°	27.1	82.3°