2009 RVT900 engine replacement. Will 2012 grasshopper higher HP D902 fit?

[Sixsixvette]

Ok, Im new to forum and this is my first post. Recently purchased a 2009 RTV900 that was smoking bad. After further inspection found a hole in the block. I found out that it is very difficult to locate a good D902 engine at a reasonable price!! But I did find a low hour 2012 Grasshopper model 325D mower that has a D902 engine in it.

Here is the information on my RTV900 valve cover tag:
Model= D902-ET03
Engine Displacement = .898L
Family = 9KBXL, 898KCB
ECS = EM
Power = 16.1kw / 3200 rpm

Here is the information on the grasshopper valve cover tag:
Model= D902-ET01
Engine Displacement = .898L
Family = BKBXL, 898KCB
ECS = EM
Power = 18.5kw / 3600 rpm

Notice the difference in the model number extension, the first family group number, and of course the higher power and rpm output.

So the question is of course, will this swap work? Will it be pretty much plug and play? Obviously the electrical connections, and accessories may need to be swapped, but will everything bolt up correctly? The extra power and rpms should be a nice benefit, But will this cause HST issues?

Any help or guidance would be greatly appreciated!

 

[Sixsixvette]

Bump

 

[Matt Ellerbee]

Not 100% sure but this may help.

 

[Sixsixvette]

Thanks Matt, that was helpful for sure. Sounds like the engine I have is variant 1, and the grasshopper engine is variant 3. Everything I can fins says it should be a simple swap mechanically. I’m still curious about the HP increase and the higher RPM capability on the HST drivetrain.

 

[Dave_eng]

Thanks Matt, that was helpful for sure. Sounds like the engine I have is variant 1, and the grasshopper engine is variant 3. Everything I can fins says it should be a simple swap mechanically. I’m still curious about the HP increase and the higher RPM capability on the HST drivetrain.

The horsepower will be a direct function of the engine rpm. After all horsepower is actually a calculated value and it is torque and rpm which, within a formula, yield horsepower.

If you slow down the max speed of the new engine with a governor adjustment you likely will end up with the original engine horsepower which would be best for your drive train.

Dave

 

[Sixsixvette]

Thanks Dave. I will give you guys some feedback on the performance after I do the swap!

Jim C