mc 16 to mc28 kits barrels, piston and rings compatibility

**Thu Apr 02, 2015 3:12 am » Post: #1 » Download Post**

hello friends...do you know if the complete head kits (barrel, piston,rings and head cam) It is compatible with all models engines nsr (mc16 to mc28)???..... Very Happy

**Thu Apr 02, 2015 10:55 am » Post: #2 » Download Post**

Everything is interchangeable, to a point. To keep it simple*, keep heads, barrels, and pistons together.

For example:

1987 MC16 head/barrel/piston combination fits all years**
1988 MC18R head/barrel/piston combination fits all years
1988 MC18SP head/barrel/piston combination fits all years
1989 MC18R head/barrel/piston combination fits all years
1989 MC18SP head/barrel/piston combination fits all years
90~93 MC21R/SE/SP head/barrel/piston combination fits all years
90~93 MC21SE/SP head/barrel/piston combination fits all years
94~97 MC21R head/barrel/piston combination fits all years
94~97 MC21SE/SP head/barrel/piston combination fits all years

DO NOT mix the R/SE/SP heads/barrels/pistons.

*This is a basic compatibility, to keep things simple.
**MC16 parts will lower the performance of all other models, due to substantially smaller exhaust ports, and lower compression. The top coolant hose orientation on the MC16 is also slightly different to all other models. Conversely, fitting MC18/MC21/MC28 parts to an MC16 will increase its performance, but do not expect 60hp without plenty of additional work.
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Andy.
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**Thu Apr 02, 2015 11:02 pm » Post: #3 » Download Post**

ok andy...thanks a lot men!!... Wink

in this moments my bike have a one kit of mc18 and the other mc21....that is dangerous??......yesterday i saw cylinder head for mi other new kit mc21 barrels but seller ask me how which i preffer....H or L cylinder heads....what differences betwen??...

**Fri Apr 03, 2015 4:56 pm » Post: #4 » Download Post**

Please search for KV3L and/or KV3H.
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Andy.
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**Tue Oct 15, 2019 4:36 pm » Post: #5 » Download Post**

Andy wrote:DO NOT mix the R/SE/SP heads/barrels/pistons.

*This is a basic compatibility, to keep things simple.

Hi Andy...I thought I read somewhere HRC fitted or recommended K3VH 'SE/SP' heads to 'R' cylinders though?

**Mon Nov 04, 2019 8:10 pm » Post: #6 » Download Post**

You might be thinking of this:

It's definitely NOT recommended to mix the heads and barrels though. The NSR is extremely sensitive to increases in compression, and it's very easy to induce detonation with even minor increases. Hence why a 0.6mm HRC base gasket is recommended when fitting the top head to the lower barrel on the MC21/MC28.
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Andy.
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