2001 yamaha ecm 68h-8591a-00-00

[Sharkman423]

Looking for ecm for 150 but was curious if one off a 200 hp would work

[rodbolt17]

most folks that buy Yamaha ECM's own spares.
what model 150 do you have?
why do you suspect an ECM?

[jfbetz01]

Ok, I'm curious. If the OP installs a ECM from say a 2001 sx200, into a sx150, does that make the otherwise 150 HP engine now a 200 HP engine? Block is the same, similar weight, displacement, etc.

[boscoe99]

Ok, I'm curious. If the OP installs a ECM from say a 2001 sx200, into a sx150, does that make the otherwise 150 HP engine now a 200 HP engine? Block is the same, similar weight, displacement, etc.

Maybe. Maybe not. There is no one single yes or no answer when comparing any two model motors.

One can go to the Yamaha parts catalog and first open up a book for an SX150TXR model. Then open up the book for an SX200TXR model. For the same year. Compare all of the parts used in one model to the same parts used in the other model. If the only difference is the CDI/ECU then that is all that it takes.

When other part differences are noted they may or may not have a bearing on the production of horse power. For instance, an SX150TXRC uses a different gear case than does the SX200TXRC. Does that affect HP? Everyone gets to guess for themselves.

[boscoe99]

Looking for ecm for 150 but was curious if one off a 200 hp would work

It will work. How well is another question you might want to consider.

A Z150TXRZ uses a different reed valve assembly than does a Z200TXRZ. How well a Z200 ECU will work with a Z150 reed valve assembly is to be determined.

I would guess that the Z150 reed valve assembly does not flow the amount of air that a Z200 assembly does. In which case the motor may be operating in an overly rich fuel/air condition most/all of the time.