Vintage Dirt Bike Q & A

Ok, I know many of you have removed the oil pump on your MTs and I just want to work out if I should do the same...

Popular cons for the system ive read the past few weeks of searching...

- the system is 35 years old, its probably dirty and worn... yes but i could clean it up and check its clearences.
- the system was uselss when it was new... ive read that many blame the oil pump for the plug fouling which the MT seems to do so well, I assume CR and MRs dont foul?
- you cant trust it... ive had plenty of oil pumped bikes and none failed, but lots of people seem to tell me they do, hmm....
- the oil pump un primes itself if left standing... ive read that there must be some kind of air leakage in the system as people suggest the oil can retreat leaving the first few mins of startup without oil
- the metering is wrong anyway, it delivers little at idle and too much flat out as honda had no real idea about this stuff back in the day... really?

So, yes I can mix my own fuel, its no biggie, it helps longevity of the steel fuel tank as it helps avoid rusting etc, but since its on there I would kind of like to use it if i can be made to work. Ive never had an issue with a pump in the past and i does make life simpler when traveling around and grabbing fuel at gas stations etc.

Any thoughts guys?

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MT250 with CR250 top end & Bassani pipe... almost fully restored.

See more of my motorbike builds at my Honda MT250 and Yamaha RD and RZ website, 2Smoked.com

If you like watches, check out my websites: DeskDivers.com & PloProf.com

I think you answered your own question.

"I've never had an issue with a pump in the past and it does make life simpler when traveling around and grabbing fuel at gas stations etc".

Ya keep it if you can and it works they are nice to have.

Thanks guys, i'll see what i can do.

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MT250 with CR250 top end & Bassani pipe... almost fully restored.

See more of my motorbike builds at my Honda MT250 and Yamaha RD and RZ website, 2Smoked.com

If you like watches, check out my websites: DeskDivers.com & PloProf.com

I ride my 75' MT250 as my daily rider in the summer and i trust my oil pump. i do 70-80 miles per tank and only myth i can correct is that the oil pump doesnt unprime itself but it does get air in the line from sitting but its only a tiny bubble or two, not enough to let the engine go unlubed.

hope this helps, I would say keep the working oil pump. I read on another post of a guy riding his mt125 at 65mph and his just quite on him and he rolled to a stop, he then rebuild the topend and ran premix.

Thanks for posting, its good to hear people do still use these. I know there can be issues with them and I expect its related to a seal or diaphragm or something inside, I might strip one and have a look and see if i can work out if its replaceable. Ive stripped and rebuilt a few yamaha autolubes now and whilst the parts are not easy to get, it is possible.

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MT250 with CR250 top end & Bassani pipe... almost fully restored.

See more of my motorbike builds at my Honda MT250 and Yamaha RD and RZ website, 2Smoked.com

If you like watches, check out my websites: DeskDivers.com & PloProf.com