classic motorcycle forum
Motorcycle Discussions => European and Other Bikes => Topic started by: redbug2 on July 20, 2015, 05:36:08 PM
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Hello,
My brother-in-law picked up a 61 NSU Supermax. I'm working on it for him. I was able to get it running but I still have some issues.
What type of oil should I use? I found some specs on the web that said it called for 20w oil. I've put that in but I'm not 100% sure that's what I should be running?
Where would I find the small 6 volt bulb that's in the headlight switch?
It's not putting out any current and will only run on the battery. I'm going to pull the case today and look things over. Maybe I will be able to charge the field and get that working?
Regards,
redbug2
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NSU Supermax (Type 251 OSB)
Production: late 1956-1963
Units built: 1956: 4440, 1957: 2563, 1958: 2357, 1959: 1403, 1960: 2619, 1961: 1240, 1962: 473, 1963: 378
Engine: 1 cylinder 4-stroke, dry sump with external oil tank and MICRONIC paper oil filter
HP: 18 at 6900 rpm
Engine displacement: 247 cc
Cylinder diameter: 69 mm
Piston stroke: 66 mm
Piston to cylinder wall clearance: 0.05 mm
Compression ratio: 7.4:1
Ignition timing: 7.6 mm or 36 deg. before Top Dead Center (TDC) with mechanical spark advance device in full open position
Spark plugs: W 240 T11, gap: 0.7 mm
Valve clearance (cold engine, piston in TDC, both valves closed): Intake valve: 0.05 mm, Exhaust valve: 0.10 mm
Valvetrain: OHC, camshaft driven by ULTRAMAX rods, hairpin-style valve springs
Carburetor: BING 2/26/55 main jet:100, idle jet 45, needle jet 2.68, needle first groove from top, idle screw 1.5 turns open
Transmission: 4 speed
Frame: solid NSU sheetmetal frame
Brakes: drum brakes
Tire size: 3.25-19" (if equipped with sidecar: 3.50-19" at the rear wheel)
Weight: 174 kg
Maximum weight: 315 kg
Length: 2051 mm
Gas tank volume: 14 ltr
Oil tank volume: 2 ltr, summer: SAE 20, winter: SAE10. Change every 2000 km. Change MICRONIC paper oil filter every 6000 km. Let engine idle long enough to pump the oil up into the oil tank; THEN check the dipstick!!!!)
Fuel consumption: 3.2 ltr/100 km
Top speed: 126 km/h (with passenger: 116 km/h)
General information: frame numbers 1830801 and up, engine numbers 3224062 and up. Two rear struts with shock absorbers instead of the single central unit of the earlier models (except some "Supermaxes" sold in New Zealand which were leftover Spezialmaxes) . MICRONIC paper oil filter.