Great video u did a super job of explaining . Filled in the blanks for understanding. Thanks Kevin.

Learned a lot here!!! So...Thank You!.. for all of the great content and information!

Hey Kevin, I learned a LOT from this video. Well done and many thanks!

Great information Kevin, thanks again

Thank you so much that was very helpful information

Kevin really knows his stuff. So helpful.

CORRECTION: Higher octane-rated fuel is a STRONGER molecular bond, not looser.

Dude. This video was fantastic. Keep up the amazing work !! Cheers, from Kangaroo land 👍

All you need to remember about Octane rating is, higher the number the more resistant it is to pre detonation, hence why high compression, forced inducted engines need a gas that won't ignite before the piston hits TDC. High octane gas is technically LESS flammable then low octane gas, if you run low octane gas in a high comp engine, it will PING due to pre ignition before TDC.

Hi I’m Kevin Shaw and I am a human encyclopedia. Good stuff man there’s a lot of science behind it. Thanks for taking your time to explain everything.

Kevin you are the Best. I have learned many things from you even whit my bad english .I stopped reading from social media.. because of stupidity there. Thanks 🙏🙏

Great video Kevin.. keep it up dude I could watch your videos 24/7 365 keep em coming 🏁🏴󠁧󠁢󠁥󠁮󠁧󠁿

Rookie here ... love your content. So I will be receiving a couple of new Yamaha VX Limited HOs in a few months. The manufacturer recommends 87/regular for this model, but would you recommend using 93/premium instead when possible?

Good video, just wanted to point out that octane rating means how prone to pre-ignitiona / detonation a gasoline is. The higher the number is the less prone pre-ignition. Also, the spark plug does not fire at top dead center unless you are at 0 degrees ignition advance. In reality the spark plug fire before TDC and the whole flame front dynamics comes afterward.

I always ran on 87 gas IS it better to use addatife OR put better gasoline so i can clean out my engine once i while LOVE your show I REALLY enjoy it THANK YOU SIR

Thanks interesting discussion

Thanks for explaining metrics

So when do the big manufacturers make these Skis with closed loop fuel systems so we can achieve optimum fuel efficiency? It's already been introduced by the tuners in the sled industry. It's safer monitoring fuel burn than waiting for the knock sensor to pull timing when the damage may have already occurred.

Hey Kevin have you done a test with any SVHO top speed run on 87 ethanol-free VS 93 octane with ethanol. FYI Kevin 61.0237 is 1 liter so like a Yamaha SVHO is Little over 109 cubic inches 🤭

Hey Kev, Sorry about the war & peace below! I know this was filmed 8 months ago so not sure if you’ll get this, but as a guy who spent his whole career operating some of the largest mining equipment on the planet I’ve never really been interested in why they work, just how to make gear work faster via operating techniques. I have to say I’ve really enjoyed your explanations on why engines, fuel, oil, impeller & pumps work - you should be a teacher your very good & entertaining!! Re the octane ratings for the Sea Doo engines. In Australia 🇦🇺 we only have 86 with ethanol then 95 then (98 which is the only fuel I’ll run in our cars). The only fuel at all of the marinas around here is 95 I’m guessing that it’ll be ok as you were saying that you run 93 in the US? Also we have a 40’ cruiser which I’m planning on using as a base for a week or so when we go away. This will mean towing our GTX 230 behind it but only at about 8 knots for an hour or so at a time to an anchorage to play. Is there any thing I’ll need to do to the GTX to prepare it for this? I towed my Kawasaki 650 stand up behind someone else’s boat once and only just caught it in time before it sank with water going back up the Venturi suction at the pump into the engine bay 😬 Only just got it started and was able to ride it around until the jet pump sucked all the water out again! Cheers Steve from Oz

Hi Kevin! In absolute emergency, can I use 87 in stage 1 tuned GP svho or rxpx300?

In Australia people are reporting a fuel like E85 provides a cooling effect.

Hi Kevin, I know you didn’t really want to touch on Octane but I have a question. In the UK the standard octane is 95 in unleaded petrol (we also have 98, super unleaded). According to the Seadoo Spec sheets. The GTI 130 & 170 are both 95 octane rated engines. The Wake 170 however is 87 octane. Why would this be? I thought it was the exact same engine is it not? This leads up to, if I’ve got this right, by and large its OK to run 87 octane in a 95 rated engine but NOT OK to put 95 octane in an 87 octane rated engine, is that correct? On that basis I would not risk buying a Wake 170 in the UK as it is an 87 octane rated engine and UK fuel (at 95) would knacker the engine. Is this right? (PS I don't yet own a PWC but am in the market). Thanks for any input :)

@watercraftjournal. I have the rxtx-300 with SCOM (all stock) can I use octane 87 in emergency cases? thanks for your time

Kevin can you pls post hyperlink for that worx /riva sponsons comparisons thank you

The major concern with that low of an ethanol content in pump fuel is deterioration of the fuel system.

A quick question Kevin please ? “Your Sea-Doo engine is designed to run most efficiently with fuel of a specific octane rating. For all engines except the 300hp Rotax 1630 ACE - 300, look for unleaded fuel with an AKI (RON+MON)/2 octane rating of 87 (or an RON octane rating of 91). Craft using the high-performance ACE - 300 engine require a higher octane level for best performance, fuel economy and engine life. Use Premium gasoline with an AKI (RON+MON)/2 octane rating of 91 (or an RON octane rating of 95).These octane requirements can also be found in the Sea-Doo Operator's Guide that comes with each craft.” Why is the 230 (basically the same as the 300 ) not included in the Sea Doo fuel notes above ?

Why do the Seadoo manuals say to fill the tank prior to storage and treat with stabilizer if you are recommending a few gallons?

What about if I use 87 and add lucas fuel additive

14:30 I thought the higher the octane the more “resistant” to combustion? That’s why you need it in higher compression engines. It resists Pre detonation. You state that it combusts “easier”

Is there any advantage in using a 95 to run a FXHO?

You can totally use 87 octane on all newer ski's. All those engines have knock sensors and computers that will adjust the timing to compensate. Not only can "use 87 to get home" you can use it all the time for years and years with no problems. No you won't get full horsepower but slightly less but who cares. On all my modern corvettes and anyone I know that has corvettes all use 87 octane gas because it's cheaper even though the manufacturer says use 91 at least. Won't hurt the engine at all. If your modding your ski for ultra horsepower maybe use 91 but if it's stock then 87 is fine all models all the time. If you have extra money to waste then go ahead and buy 91`.

440 is actually 7.2. 7.4 is a 454

Just as a “ jokey “ observation 😂 At 8000 rpm , there are not 8000 explosions every minute ! Half that !

educate these rooks lol

i love your channel, but these videos are waaaaay too long.

Ruined 2 high pressure fuel pumps in a newer Evinrude Etec by using Ethanol fuel and all the additives bells and whistles. If I had to run ethanol in any water craft for any reason I'd drain the tanks and run it dry at the end of the day. Ethanol = a big ass sponge for sucking water into your fuel system. Nothing but non ethanol goes into any of my watercraft, period..