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    TMS received a new G4-850 summit in early April of 2016 Directly from Ski-doo to develop a new Big Bore and other performance modifications that owners of new summits are looking for. We were 5 years ahead of "the competitions" big bores with our 872 Etec engine package and are way ahead of the curve with G4 products despite what they may say or think!


2   The TMS G-4 927 is the most developed engine product we have ever done here at our Engine Development Facility with tons of time on our in house SuperFlow Dyno Facility and 30 Plus days in the Western Mountains testing ourselves.


     The crew at TMS in a 4 month period in 2016-2017 has logged over 30 days in the mountains with elevations ranging from 4,000 to 11,000 feet  along with countless dyno hours extensively testing and developing our G4 products to deliver the best performing and most reliable 850 performance products available. Low elevation testing and calibrations are completed also on the G4-927 Summit models with specific fuel requirements. TMS does not and never will market any product to gain a sale until it is fully developed and completely meets our quality standards.


    We pride our self on the development of the 927 engine package which has resulted in an engine that is smoother than stock, and is extremely quick spooling getting you up on the snow quicker than anything else out there. When you purchase a TMS 927 kit you will get everything in the base kit required to be ready to ride including pre-programmed fuel controller and clutching/gearing calibrated for your specific application.


TMS G4 - 927 pricing starts at $2,450.00,  servicing customer supplied cylinder, head and rave valve blades.

-Fuel controller- program installed for each application. TMS-Dobeck specific for each application and correct fuel offsets to each cylinder which is required

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-Calibrated clutching package- Summit and Freeride vehicles, Which will include our own 927 specific primary ramp set, custom helix.


V-Force reeds that we helped develop for the G-4 engine can be added for the cost of 195.00 with our engine packages.



    When you purchase a 927 kit you will get everything required to "pull the rope and go" once the engine is installed by one of our certified dealers.   We had 4 G4 summit shop sleds this last winter in with different packages to develop a tune for just about every track length, rider size and engine package available. 


     We are the only Rotax performance shop on the planet that has the foresight and technology to diamond hone and finish nikasil to what we have found to be the perfect finish and bore size from our continued dyno and durability testing in real world applications. Everything at TMS is done in house with the exception of cylinder plating which we take and finish to our specific application.  


  The first weekend a TMS 927 hit the hill on the RMSHA circuit it took the win with Tom Roby leading the way.There were many more 1-5 finishes throughout the season with much more to come next year when our racers have our products on the G4 freeride package.  


*TMS does not utilize or endorse any currently advertised ECM reflash on our line of Ski Doo Performance products, (specifically the TMS G-4 927.) We have already seen issues quickly arise with people who have bought into the sales hype. Our fuel controller is the only way at this time to properly fuel our line of products as well as not create warranty issues with a ":marked" ECU. 

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Ski Doo factory racer Jay Mentaberry dominated the 1000 improved class at the RMSHA circuit during the 2018 season with wins and end of year point championship on board the TMS G-4 927!

2017-2020 SUMMIT G4 927

TMS BIG BORE

Your Rotax Performance Expert       1 (507) 281 3545