MC21 Oil pump setup on my MC28???

**Fri Jan 15, 2010 3:45 pm » Post: #1 » Download Post**

Hey dudes

Will an MC21 oil pump setup work on my MC28?? Cool

Cos my bike came without one Rolling Eyes

**Fri Jan 15, 2010 4:26 pm » Post: #2 » Download Post**

no, the MC28 has an oil galley to feed the right hand crank bearing that the MC21 oil pump doesn't have...

**Fri Jan 15, 2010 5:39 pm » Post: #3 » Download Post**

Not quite true Charles, the later MC21s had the second oil gallery like the MC28's. Not quite sure when they changed over....Andy might chime in.

Check the oil pump...... I think the two holes are visable.

**Fri Jan 15, 2010 8:20 pm » Post: #4 » Download Post**

the change over was in 93, wvhich means that 66% of the NSR's probably have the non MC28 type pump. If you can get an MC21 pump with the oil feed, you can use it, but you have a better chance of not getting one then you do.

The other option is to block off the oil galley in the engine case, and go with the MC21 pump that just feeds the carbs.

Either way, you best off just looking for an MC28 pump as trying to explain to someone who's selling a used MC21 pump what to look for could be hit and miss.

**Fri Jan 15, 2010 8:55 pm » Post: #5 » Download Post**

Is there any chance of someone posting a pic of the oil pumps to show the difference?