Havoc VS Stampede Motors

[Jon W]

looking around and cannot find and Stampede motors, the Havoc looks to directly bolt in, with exception of the larger displacment. has anyone looked into this further? seems to be a better option considering stampede engines are on backorder. 

[SwiftV8]

I'm in the same boat myself, did you ever try the Havoc 1000 engine? I would assume we would need the ECU as well.

[Kerry Drown]

I am seriously considering replacing my 2017 Textron Stampede 900 engine with a 2018 Arctic Cat Havoc 1000. Most of the parts appear to be interchangeable. Wondering if anyone knows if this can be done and if so, what else needs to be converted. Thanks!

[DPW]

I know this is an older thread but I'll relay what I have found. The Havoc X engine does bolt directly into the Stampede. All of the fuel and firing components are the same part numbers. The engine will however not run on the Stampede ECU for two main reasons. 

The bore and stroke of the Havoc X are both greater than the Stampede engine.  Stampede 89mmX68 and the Havoc X 92mmX72mm.

Both reluctor rings (crankshaft position) have 34 teeth. The big difference is the Top Dead Center gap on the rings. On the Stampede the TDC gap would have space for 2 to 3 teeth. On the Havoc X the TDC gap would have space for 3 to 4 teeth. The TDC gap is significantly wider on the Havoc X which would cause the ignition and fuel timing to be thrown out of operational boundaries by the Stampede ECU.

As far as a bolt on remedy it looks to me like the Havoc X engine will require a Havoc X ECU. A used one would be the best option if one can be found.  A factory ordered one will require a Havoc X VIN. Some new ones can be found but they will have to have the VIN programmed in to be operational (so I'm told).

Questions, comments or ideas?

[92wrangler]

On 8/5/2024 at 5:35 PM, DPW said:

I know this is an older thread but I'll relay what I have found. The Havoc X engine does bolt directly into the Stampede. All of the fuel and firing components are the same part numbers. The engine will however not run on the Stampede ECU for two main reasons. 

The bore and stroke of the Havoc X are both greater than the Stampede engine.  Stampede 89mmX68 and the Havoc X 92mmX72mm.

Both reluctor rings (crankshaft position) have 34 teeth. The big difference is the Top Dead Center gap on the rings. On the Stampede the TDC gap would have space for 2 to 3 teeth. On the Havoc X the TDC gap would have space for 3 to 4 teeth. The TDC gap is significantly wider on the Havoc X which would cause the ignition and fuel timing to be thrown out of operational boundaries by the Stampede ECU.

As far as a bolt on remedy it looks to me like the Havoc X engine will require a Havoc X ECU. A used one would be the best option if one can be found.  A factory ordered one will require a Havoc X VIN. Some new ones can be found but they will have to have the VIN programmed in to be operational (so I'm told).

Questions, comments or ideas?

Has this been accomplished? Is it successful?

[DPW]

Yes I had to buy a new ECU. It took a few weeks to get and it runs great. The only thing I had to change was the cowling for the drive belt. I had to trim the plastic to fit the Havoc X engine. 

Be careful with the throttle after installing the engine, because you now have the torque of a 100 hp engine replacing an 80 hp engine. The drive components, belt and transmission weren't designed for the the additional torque the Havoc X engine develops. 

[JrCors21]

Hey DPW! Could you please share where you purchased the Havoc Ecu... I havent been able to find one and would like to know where to get one please

[JrCors21]

Sharing some havoc/stampede current problem or issues im facing...

I have a Stampede 900 that was running but was making a knocking noise. Decided to risk it and Changed it to the havoc 1000cc engine. It is a direct fit as previously stated. Compared all the parts and everything, with the exception of pistons and cranks, are exactly the same. Even the reluctor ring is exactly the same one. Put both back to back and there is absolutely no difference at all. Yes I had to tear both engines apart to try and make one that'll work. I did look for havoc ecu to try and make it a bolt on swap but had no luck finding one. Had to do everything mentioned above instead. With all this being said...

The havoc motor will start and run. It will rev up really nicely too! My issue is that it will not stay on when iddling. It will shut off if I let go of the gas. No backfires or symptoms of being out of time either. Replaced all new sensors with the original ones. Still no difference. Do guys think its definitely just a computer problem? Where can I get one! I desperately need help. 

 

 

[Bee]

JrCors21 have you made any progress if so what was your remedies as I’m looking to accomplish something similar. I have a brand new Havoc engine and transmission. Thx

[DPW]

A copy of my post 4-7-25:

I know this is an older thread but I'll relay what I have found. The Havoc X engine does bolt directly into the Stampede. All of the fuel and firing components are the same part numbers. The engine will however not run on the Stampede ECU for two main reasons. 

The bore and stroke of the Havoc X are both greater than the Stampede engine.  Stampede 89mmX68 and the Havoc X 92mmX72mm.

Both reluctor rings (crankshaft position) have 34 teeth. The big difference is the Top Dead Center gap on the rings. On the Stampede the TDC gap would have space for 2 to 3 teeth. On the Havoc X the TDC gap would have space for 3 to 4 teeth. The TDC gap is significantly wider on the Havoc X which would cause the ignition and fuel timing to be thrown out of operational boundaries by the Stampede ECU.

As far as a bolt on remedy it looks to me like the Havoc X engine will require a Havoc X ECU. A used one would be the best option if one can be found.  A factory ordered one will require a Havoc X VIN. Some new ones can be found but they will have to have the VIN programmed in to be operational (so I'm told).

Questions, comments or ideas?

Expand  

Has this been accomplished? Is it successful?

•  
• Quote

DPW

Posted April 7, 2025

• #6  

Yes I had to buy a new ECU. It took a few weeks to get and it runs great. The only thing I had to change was the cowling for the drive belt. I had to trim the plastic to fit the Havoc X engine. 

Be careful with the throttle after installing the engine, because you now have the torque of a 100 hp engine replacing an 80 hp engine. The drive components, belt and transmission weren't designed for the the additional torque the Havoc X engine develops.