Keep em coming man!! It’s awesome that u are crankin out new vids!! Still waiting to see the final results of some of these bikes though (that Kawasaki). 👍
Hi.. I have a quick question. I have a Yamaha RX-135 2 Stroke & I sure as hell know how important it is to have a Oil Pump working in your 2 Stroke Bike to avoid Engine Seizures. But these days I see so many manufacturers with their new Dirt Bikes with absolutely no Oil Pump. They recommend Pre-mixing to a ratio & run the bike, but what I don't understand is that a dirt bike being a powerful machine how would the crank, pistons, sleeves & Ring get properly lubricated at high RPM's when the ratio of oil would be the same from the carbs at any given RPM.. Oil pump at least makes sure the proper ratio of oil going through in the combustion chamber in regards to the throttle position. You have any ideas why?
This is an absolutely great question. It is multi part answer... You are correct, the oil pumps are designed to give the correct amount of oil needed at X amount of rpm. Also, the great thing about an oil pump is that it allows lubercation at no throttle situations, such as coasting down a hill. With pre-mix (no pump), you gain simplicity, weight savings, and peace of mind knowing that there will be oil introduced to the engine. You are correct though. The amount of oil being introduced with pre-mix is only correct for a certain RPM range. What rpm range? More than likely the range that the manufacture designed the powerband to be at. This is also why dirtbikes will need the topends and cranks rebuilt so often. The Suzuki GT750 is a prime example of how long a 2T can last of set up properly. You can get 30k miles on one without a rebuild. I have always enjoyed mixing my oil on my boats. It is the peace of mind I want when Im out in the ocean. Also, you swap to pre-mix on an oil injected bike (removing/blocking off pump) you change the jetting due to you now have oil taking up a bit of room in that jet passage way. To convert a bike to pre-mix properly, you must also install larger jets to allow for the now extra oil to pass through the jets. All in all, I personally like the pumps.
@@MotorcyclesandArt I personally believe the new manufacturers are negating the Oil Pumps purposefully to make sure the Dirt Bike riders have to rebuild their Top ends all the time earning the Manufacturer more revenue to continue supplying spare parts. With regards to KTM they had in between introduced a electric oil pump which had a reputation of screwing up all the time. I personally keep an eye of the exhaust smoke to make sure that my 2005 bike is burning 2T oil to be sure.. 😆.. But this issue can be solved in new age bikes by simply adding a sensor cautioning the rider that his oil pump is shot. Either ways a 2T tank would hardly be a 1.5L Tank or 900gm in weight at any given time so seriously negating it all together is a fool's errand.. But then this is my personal opinion, dirt bike riders should actually be making a throw of this question to their respected manufacturers.
![일상 속 기분 좋음 [Proto disco meme]](http://i.ytimg.com/vi/DwmEIaZ7XGQ/mqdefault.jpg)
Thanks for this excellent information for us guys trying to keep these old beauties alive.
Great info.
Keep em coming man!! It’s awesome that u are crankin out new vids!! Still waiting to see the final results of some of these bikes though (that Kawasaki). 👍
The screw with the red washer behind it is an air bleed screw for the pump.
Hi.. I have a quick question. I have a Yamaha RX-135 2 Stroke & I sure as hell know how important it is to have a Oil Pump working in your 2 Stroke Bike to avoid Engine Seizures. But these days I see so many manufacturers with their new Dirt Bikes with absolutely no Oil Pump. They recommend Pre-mixing to a ratio & run the bike, but what I don't understand is that a dirt bike being a powerful machine how would the crank, pistons, sleeves & Ring get properly lubricated at high RPM's when the ratio of oil would be the same from the carbs at any given RPM.. Oil pump at least makes sure the proper ratio of oil going through in the combustion chamber in regards to the throttle position. You have any ideas why?
This is an absolutely great question. It is multi part answer...
You are correct, the oil pumps are designed to give the correct amount of oil needed at X amount of rpm. Also, the great thing about an oil pump is that it allows lubercation at no throttle situations, such as coasting down a hill.
With pre-mix (no pump), you gain simplicity, weight savings, and peace of mind knowing that there will be oil introduced to the engine.
You are correct though. The amount of oil being introduced with pre-mix is only correct for a certain RPM range. What rpm range? More than likely the range that the manufacture designed the powerband to be at.
This is also why dirtbikes will need the topends and cranks rebuilt so often.
The Suzuki GT750 is a prime example of how long a 2T can last of set up properly. You can get 30k miles on one without a rebuild.
I have always enjoyed mixing my oil on my boats. It is the peace of mind I want when Im out in the ocean. Also, you swap to pre-mix on an oil injected bike (removing/blocking off pump) you change the jetting due to you now have oil taking up a bit of room in that jet passage way. To convert a bike to pre-mix properly, you must also install larger jets to allow for the now extra oil to pass through the jets.
All in all, I personally like the pumps.
@@MotorcyclesandArt I personally believe the new manufacturers are negating the Oil Pumps purposefully to make sure the Dirt Bike riders have to rebuild their Top ends all the time earning the Manufacturer more revenue to continue supplying spare parts. With regards to KTM they had in between introduced a electric oil pump which had a reputation of screwing up all the time. I personally keep an eye of the exhaust smoke to make sure that my 2005 bike is burning 2T oil to be sure.. 😆.. But this issue can be solved in new age bikes by simply adding a sensor cautioning the rider that his oil pump is shot. Either ways a 2T tank would hardly be a 1.5L Tank or 900gm in weight at any given time so seriously negating it all together is a fool's errand.. But then this is my personal opinion, dirt bike riders should actually be making a throw of this question to their respected manufacturers.
@@MotorcyclesandArt What are the specs for setting the floats in the Yamaha LS2 Mukuni VM17SC carbs? There's nothing in the service manual...
What happened to the kz400