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 Topic: mc16 engine 







Andy
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Andy » Mon Aug 10, 2015 3:38 pm

Thanks for the kind words, krull. Smile

Difficult to say, regarding the age by the VIN. The problem is a lot of swaps have taken place over the 28 years the NSRs have been around!

Here's a basic run down for you:

All NSR250 crankcase castings are designated MC16E. (Not all NSR250 cases, notably many HRC ones, are stamped though.)

1987 MC16:

Solid engine mounts | crank with separate centre seal | hex barrels/heads with 90° alloy outlets & additional small brass hose unions | small exhaust port windows & RC Valve flaps

1988 MC18 R2J/R4J SP:

Rubber engine mounts | crank with separate centre seal | hex barrels/heads [top head with steel spigot] | large exhaust port windows & RC Valve flaps.

1989 MC18 R5K/R6K SP:

Rubber engine mounts | crank with integral centre seal | hex barrels/heads [top head with steel spigot] | large exhaust port windows & RC Valve flaps.

90~93 MC21 R/SE/SP:

Rubber engine mounts | crank with integral centre seal | round barrels/heads [top head with steel spigot] | angled exhaust port windows & RC Valve flaps [for reduced piston ring wear].

In 1991 the crankcases and oil pump were redesigned, for additional crankshaft lubrication on some models. In 1992, the modification was carried over to all engine variants.

94~97 MC21 R/SE/SP:

Same as late MC21.
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Andy.
NSR-WORLD.COM

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