NSR250 MC18 Barrel Identification

**Mon Jun 03, 2019 12:17 pm » Post: #1 » Download Post**

Hi hope someone can help please.

I am currently rebuilding my son’s NSR250 MC18 R5K engine and I am trying to identify which Cylinder is the front one.
The one cylinder has F (No. 13121837) and the other has F2 (13121838) stamped on the Barrels.

Both cylinders will need Niksil plating and new Pistons which I am in the process of sorting.

Many thanks
Philip

**Mon Jun 03, 2019 2:48 pm » Post: #2 » Download Post**

Front and rear are interchangable, but there are 3 different types.
https://www.cmsnl.com/honda-nsr250r5-1989-k-japan_model49610/partslist/0051.html#.XPUyQWBFw0M
_________________
Why do things simply when you can complicate them

**Mon Jun 03, 2019 2:51 pm » Post: #3 » Download Post**

2J & 4J cylinders are also compatible . There are quite a few posts on this to search through
_________________
Why do things simply when you can complicate them

**Wed Jun 05, 2019 8:24 am » Post: #4 » Download Post**

Hi RobH

Many thanks for that, much appreciated.

I take it the 3 different Cylinders listed at csml are the ones Honda stamped as A,B,C

Once again many thanks

Philip