Strange Results

[Franko]

Full Riva Stage 2 including the 15/20 prop:

Stock ECU: 72 mph at 7750 RPM

RR ECU: 69.8 at 7600 RPM

Both ECU's spun the prop out of the hole. Out of the hole, RPMs would shoot to 8200 (stock ECU) and 8350 (RR ECU), then settle into the 7600-7750 range.

Pro Series opas blockoffs are awesome and thru hull exhaust sounds mean. Now if I could just get my RPMs up, things would be great.

[11]

Now if I could just get my RPMs up, things would be great.

As long as that's the only thing that doesn't get up.

Sorry that was lame, I know.

Anyways I don't remember where I got this from but I think wiring harnesses on RXPs changed a couple times, maybe you have the wrong harness or miss an adaptor.

[Rendog]

Those are very similar results that my riding buds are experiencing!

[psycho rxp]

maybe open up the venturi a little for some more rpms..might be worth a shot...It worked on mine

[11]

The fact Frank gets more RPMs from stock compared to RR means he has electrical/compatibility problems.

Or maybe the Riva stage 2 and Rotax ECU aren't meant to work together.

[Green Hulk]

Well, i have heard of someone using the RR ECU with the Riva Stage 2 with positive results.

I think i would like to back to back test Franks ECU with mine.

[Shibby1485]

i'm not even so sure it's the ECU that's the problems.... it's like each ski is wired completely different and if u get a lucky RXP it will accept the RR ECU..... this compatibility issue just doens't make sense in my mind no matter which way i look at it.

[ActionR32]

I have similar #'s

Full Riva Stage 2 with 14/19 8100rpm all day, ?? MPH (No GPS)

Riva Stage 2 with 15/20R 7750rpm max 70.6mph (GPS) 2 bars from full (gas)

Stock ECU, RR Thermostat.
Temps mid 80's

Riva Stage 1 8050rpm GPS 71.5mph 1/2 tank of gas
Rider 240lbs 6'4"

[TLR]

Frank, Get a Llama, they are fast @ about 40mph, cut and fertilize your lawn at the same time too!!

http://www.mountlehmanllamas.com/llama-running1.MOV

TLR

[TLR]

sounds like the OEM ECU is the winner!

how about adjusting the throttle cable,etc??

borrow someones venturi thats been opened up just a tad to test with.

and maybe borrow a 14/19 to test also.

I read somewhere in the wiring harness there are diodes that need to be disabled or something? for that RR ECU to work right??

Tim