I just purchased a used bike with the ninja backup kit, a 2017 WR450 and '19 TS 129LE.
The previous owner claimed the bottle was just shy of full so I didn't weigh it or try to have filled. What type of bottle pressure are you getting? I understand it is affected by altitude, temperature, etc. Bottle read 400PSI all day, I had a real small leak in a fitting I found in the parking lot going on the maiden voyage so only turned bottle on when I planned on using it. The guy I bought the bike from said that the 'down' position on the mapping/arming switch (small button pushed) arms the nitrous but the difference was so minimal I honestly couldn't tell the difference?
Tomorrow I am going to go through the kit, re thread seal all the fittings and give it a once over including making sure the jet in the intake is turned in the right direction (the only info I have to check installation is from online videos from Raze).
Also, what temperature does the ECU require to enable the nitrous? Could not find a specific number on raze's website. Bike seemed to run quite cool at times (between 110-130 is what the thermo sensor on the Voyager was telling me).
Sorry about the book there guys. Looking forward to getting this thing dialed, coming off of an N/A 2016 yz450fx /2018 TS 120 ARO