MC21 oil pump setting

**Sat Sep 11, 2010 3:59 pm » Post: #1 » Download Post**

Hello!

I have a problem with my MC21. The thing is that the mix oil consumption is crazy. The bike is not really smokey when running, but there must be something wrong because the ratio is about 13:1 and yesterday I just made 320km. with a full oil tank (2 liters).

I´ve seen two small marks in the pump, but I don´t know is it´s set up correctly, so if anybody knows the way, please let me know it. I´m not sure if that is the problem, but at least if I know that is OK and the problem is still there I can start to check the pump itself.

Any information about all of this would be appreciated.

Thank you very much!!!

Two Stroke Power
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Two Stroke Power

**Sat Sep 11, 2010 7:53 pm » Post: #2 » Download Post**

Sometimes the seal on the oil pump drive shaft can slip down and let the two stroke oil run into the gearbox.
Check your gearbox oil level.
To check the seal, undo the two bolts for the oil pump and pull it up. If the seal has dropped down it can be cleaned up and refitted with a bit of Loctite or bearing fit to stop it from slipping down again.

**Sun Sep 12, 2010 9:06 am » Post: #3 » Download Post**

http://tech.nsr-world.com/nsr/nsr-all/oil-pump/

**Sun Sep 12, 2010 3:40 pm » Post: #4 » Download Post**

Thanks for the answers!!

I know the problem with the oil seal because I had it in my bike the last month. I tried to find it in Honda but they sell the pump and it cost about 400€... Finally I found the oil seal by Internet in Singapore and rapaired it the last week.

I was testing the bike after this and it was when I saw the crazy oil consumption. I thought it was the oil seal again, but drain the gearbox oil and it was OK, so I think the problem is the pump.

The thing is that the marks are aligned and everything seems OK.

Do you know the oil mix ratio with the pump?

Could you tell me the aprox. mileage you make with a full oil tank?

Thanks again!!
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Two Stroke Power

**Sun Sep 12, 2010 7:21 pm » Post: #5 » Download Post**

Here again

Finally I´ve found the problem. The solenoid of the oil pump has some kind of pin which is broken. I don´t know exactly how it works, but I guess that is always fully open and pump too much oil all the time.

Now I´m trying to find it in the sale forum because in Honda just can buy the oil pump complete.[/img]
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Two Stroke Power