H1-R
Note: From an H1-RA manual Compression Ratio: 8.0 Igniton timing: 25 deg BTDC Plugs: NGK B-10.5 EN or B-11 EN Fuel: Gasoline above 97 octane Lubrication: Superlube and 20:1 pre-mix Gearbox ratios:
				Ratio				Total
1st				1.882				9.662
2nd				1.400				7.188
3rd				1.136				5.832
4th				1.000				5.134
5th				0.920				4.723
Primary:				2.407
Final:				2.133
H1R-A Port Timing: Note: These would vary, especially on the factory racers. These specs used a 4mm cutaway on the piston intake. The second set is the earlier H1R of port timings.
Inlet	Open				BTDC	85 Deg			81 Deg
Inlet	Close				ATDC	85 Deg			81 Deg
Transfer	Open				BBDC	70 Deg			63 Deg
Transfer	Close				ABDC	70 Deg			63 Deg
Exhaust	Open				BBDC	101 Deg			97 Deg
Exhaust	Close				ABDC	101 Deg			97 Deg
Carburetor Specs: Mikuni VM35SC
Part Name		Code	Specification				Alternate Specs
Main Jet		MJ	350				L: 320 C: 310 R: 330
Air Jet		AJ	2.0				2.0
Jet Needle		JN	6F5-3				6H1-3
Needle Jet		NJ	Q-O (8mm)				Q-5
Throttle Valve		CA	3.5				3.0
Pilot Jet		PJ	60				60A
Pilot Outlet		PO	1.8				1.8
Air Adjusting Screw		AS	1/2				1/2
Float Level (from bore center)			1.44 in. (36.5+/- 1mm)				1.36 in (34.5 +/- 1mm)
Heads: An early type listed for use with out the piston skirt cutaway measures 33.9mm from the face of the head to the top of the plug hole. The later type measures 32.7mm. Chambers: Still trying to find specs.