Why did my Yamaha YZ250 come to a stop?
For this Yamaha YZ250 motor, it was the crank after 250 hard hours. It made dreaded noises and came to a skidding stop in the middle of the California desert. We feared catastrophic failure, but in the end, it was simply roasted crank bearings.
How much does a Yamaha YZ250 case cost?
Luckily it didn’t do much damage because the cost of Yamaha YZ250 cases can run more than $1,000! Adam Booth Pull out the crank bearing seals; heat and fire are on the way.
What happens to a 2 stroke Yamaha engine?
Adam Booth Put enough hours on a 2 stroke engine and something will let go. For this Yamaha YZ250 motor, it was the crank after 250 hard hours. It made dreaded noises and came to a skidding stop in the middle of the California desert. We feared catastrophic failure, but in the end, it was simply roasted crank bearings.
Which is harder to split a 2 stroke engine?
Two-stroke cases are much harder to split than 4 stroke cases and that’s why tools like this were invented. A little tip is to tap around the cases with a rubber mallet as you crank on the case splitter to help the cases split apart.Adam Booth As you lift the left case off, watch for the crank and try not to knock the transmission around too much.
For this Yamaha YZ250 motor, it was the crank after 250 hard hours. It made dreaded noises and came to a skidding stop in the middle of the California desert. We feared catastrophic failure, but in the end, it was simply roasted crank bearings.
Adam Booth Put enough hours on a 2 stroke engine and something will let go. For this Yamaha YZ250 motor, it was the crank after 250 hard hours. It made dreaded noises and came to a skidding stop in the middle of the California desert. We feared catastrophic failure, but in the end, it was simply roasted crank bearings.
Luckily it didn’t do much damage because the cost of Yamaha YZ250 cases can run more than $1,000! Adam Booth Pull out the crank bearing seals; heat and fire are on the way.
Where can I get a 2 stroke engine rebuilt?
We contacted Hot Rods and ordered up a bottom end kit, which comes with the crankshaft, main bearings and seals, and a complete gasket set. It also included a Vertex piston and rings. We sent the cylinder off to Millennium Technologies for a re-plate. Here is a look at our rebuild of the 2 stroke engine.
Why did my Yamaha 2 stroke engine quit working?
Put enough hours on a 2 stroke engine and something will let go. For this Yamaha YZ250 motor, it was the crank after 250 hard hours. It made dreaded noises and came to a skidding stop in the middle of the California desert. We feared catastrophic failure, but in the end, it was simply roasted crank bearings.
How do you put new bearings on a dirt bike?
The new ice-cold and shrunken bearings will drop right into place without force after heating up the cases. We heat the cases for at least five minutes and place the bearings in a freezer overnight. You might have to lightly tap the bearing in, but done right it will drop right into place. Adam Booth