1 liter TR-1 vs 1 liter MR-1

[Miami_Oh_Yeah!]

The 1 liter MR-1 started out at 100 hp and amazingly was revamped to 140 hp and then HO 160 hp

Will Yamaha eventually make the 1 liter TR-1 into a higher than 112 HP edition? Or was the EX TR-1 at 100 HP and then the HO TR-1 to get to 112 HP the only incremental improvement?

 

[Neutron]

The 1 liter MR-1 started out at 100 hp and amazingly was revamped to 140 hp and then HO 160 hp

Will Yamaha eventually make the 1 liter TR-1 into a higher than 112 HP edition? Or was the EX TR-1 at 100 HP and then the HO TR-1 to get to 112 HP the only incremental improvement?

The ex TR1 is only rated at 100hp with only a 144mm pump.
The EXR has the TR1 HO and everything else with a TR1, VX or boat is the TR1 HO with 155mm pump the hp rating on the HO is around 120hp

 

[FSH 210 Sport]

The 1 liter MR-1 started out at 100 hp and amazingly was revamped to 140 hp and then HO 160 hp

Will Yamaha eventually make the 1 liter TR-1 into a higher than 112 HP edition? Or was the EX TR-1 at 100 HP and then the HO TR-1 to get to 112 HP the only incremental improvement?

Well, technically there is a 140 hp version of the TR-1 but it is known as the Viper engine and it is in a Yamaha snowmobile model. There is also the YXZ version that is in the Wolverine side by side that has more horsepower than the TR-1 but less than the Viper. Then there is the Genesis turbo charged version 998cc at 172 hp. So some various engines all based on the same block and crankshaft but with other intake tracts and some engines have closed loop fuel injection as opposed to the open loop fuel injection on the TR-1’s.

I was thinking of installing Brian Crower cams that would increase the volumetric efficiency of the engine and bridge the gap between the TR-1 and the Viper engines.

Thread 'Anyone install Crower cams in their TR-1 / Viper / Genesis engines?'

Jan 6, 2024

Curious if anyone out there has looked into or installed Crower cams in their three cylinder Yamaha engines. Brian Crower has quite the selection of engine hard parts for the TR-1, Viper, or Genesis engines, the only base difference I see is the bore of the Viper / TR-1 engines being two millimeters larger than the Genesis engine. The Genesis version is in Yamahas snow sleds, and in the turbo charged configuration makes 172 hp. Looking at a long term project for when the YES warranty runs out.

https://store.briancrower.com/

• FSH 210 Sport
• Replies: 10
• Forum: General Discussion

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Here are a couple of other threads on getting a little better performance out of the TR-1 engines.

RIVA claims “big gains” with their ribbon delete but at last look did not provide any quantitative results showing these big gains.

Thread 'TR-1 Ribbon delete....'

Mar 1, 2017

Has anyone heard of the performance difference on the tr-1 engines with a ribbon delete??
Im looking into the possibility of doing it.

• LeeFlan7
• Replies: 61
• Forum: General Discussion

One thing to keep in mind about RIVA tuners is that they raise the rev limiter and require lower pitch impellers to allow the engine to rev higher, this increases the stochiometric ability of the engine, add roughly two degrees of timing advance and add a little fuel to pick up a bit of power. There is

Thread 'Tuning a TR1 - Riva Tuner'

Aug 4, 2020

I was looking into performance upgrades for my TR1s which have run out of power for wakeboarding and wake surfing. I shot an email over to Riva (who makes a tuner for the TR1) and they had a helpful reply I will post here for everyone's information:

Brian:



The largest part of the performance improvement possible with the tunes we make for the TR-1 engine is dependent on the higher RPM limit of those tunes and the use of a jet pump / impeller combination that reduces engine torque load sufficiently for the engine to approach those higher RPM limits yet works efficiently enough to...

• brian86992
• Replies: 42
• Forum: General Discussion

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This is a good thread discussing the RIVA map tuner, especially posts 44 & 45.

Thread 'RIVA Maptuner X ECU Reflash: Throttle Response and Speed Control'

Nov 5, 2017

RIVA's Maptuner X is a blast. I have had the Maptuner 1 in the past, and there is just no comparison - as far as speed, and ease of use.



There is a ton of information on the system on greenhulk, albeit mostly concerning forced induction engines. Ordering through greenhulk store is the best way.
http://www.greenhulk.net/forums/showthread.php?t=246087
https://rivaracing.com/p-33822-maptunerx.html
https://www.4-tecperformance.com/index.php?main_page=index&cPath=180

RIVA Maptuner is supported by a team led by Jesus Garcia. He has a reputation as a master...

• swatski
• Replies: 111
• Forum: General Discussion

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These air filters give a little boost in performance, I picked up 200 rpm at WOT with these.

RIVA Yamaha EX/EXR/VX/JetBlaster (TR-1) Replacement Performance Air Filter

Our RIVA Yamaha EX/VX (TR-1 engine) Replacement Performance Air Filter directly replaces the stock paper element delivering performance through greatly improved air flow without sacrificing filtration or reliability.

rivaracing.com

I also picked up an in-line pulse width modulator that goes in between the wire from the ECU and each injector to add some fuel but I haven’t gotten around to testing it yet.