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Discussion Starter · #1 ·
I was wondering if anybody had tried using higher octane fuel in the seadoo spark I'm thinking about putting in some 93 octane and see if it improves response but wanted to get some other opinions first as in the manual it states 87 octane.

Also has anyone else experienced a bit more engine vibration after break in?
I am at 24 hours now and it seems like it vibrates a little more at idle than it did when it was brand new. It was really tight when I first got it.. almost seems like an engine mount may have loosened a bit as you can see the bars shaking slightly at idle and I didn't notice it before
Thanks.
 

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Yes mine shakes what feels like alot when flushing on the trailer. If i go over 5000rpm it disappears. I guess it's the nature of 3 cyl 4-stroke engines.
 

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I've been using Premium octane in my Sparks for several months now. I know it's not required but they say Premium sometimes has less or no ethanol. I only put 2.5 gallons in at a fill up some the extra cost is negligible. I'm at 20 hours as well.

I started doing this because my other small engines like GSXR, John Deere, chain saw etc starting running like crap on regular 87.
 

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I was wondering if anybody had tried using higher octane fuel in the seadoo spark I'm thinking about putting in some 93 octane and see if it improves response but wanted to get some other opinions first as in the manual it states 87 octane.

Also has anyone else experienced a bit more engine vibration after break in?
I am at 24 hours now and it seems like it vibrates a little more at idle than it did when it was brand new. It was really tight when I first got it.. almost seems like an engine mount may have loosened a bit as you can see the bars shaking slightly at idle and I didn't notice it before
Thanks.
if the engine was designed to run on 87 then that is what you should run, the octane rating is a number that represents resistance to detonation, the higher the number the harder it is to "light" or ignite the fuel, which basically means high octane fuel is a slower colder burning fuel, high octane fuel is required in high compression engines to prevent detonation and preignition, the spark is not a high compression engine.

Both of my sparks have a vibration at an idle, always have, as soon as you touch the throttle it goes away, I figure it has something to do with the harmonics of the driveline/hull, my old Sea-doos did too.
 

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Discussion Starter · #5 ·
Cool thanks maybe I should run 93 octane in my old 2 stroke tigershark maybe I won't put anymore holes in my piston lol thanks guys
 

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I would stick with what the manual says. I think that deviating from that is just making yourself feel good by spending more money. I don't think there is actually much of a benefit.
 

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Running 93 isn't going to do anything on a stock ski. If you are running a tune, yes run 93.

Standard 93 still has ethanol- you need to look for 'rec fuel' which has no ethanol and is generally 91+ octane (at least in tampa)
 

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I own a 2010 V6 Camaro and the manual says 87octane recommended also. But when looking at the gen 5 forum board the builders have done tests and notice the computer will pull the spark advance more on 87 than 93. But never found out how much hp that translated to.
Don't know if Sparks have a knock sensor but it may be worth looking into.
 

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I own a 2010 V6 Camaro and the manual says 87octane recommended also. But when looking at the gen 5 forum board the builders have done tests and notice the computer will pull the spark advance more on 87 than 93. But never found out how much hp that translated to.
Don't know if Sparks have a knock sensor but it may be worth looking into.
yes, they do have a knock sensor
 

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I dont remember (long since ive used 95) but when i think of it dosent jump out of the water when hitting the throttle wide open in sport when running on 98, witch it did when I had 95 in the tank. Not 100% sure, but I will fill 95 when i have used up the 98


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Tech flash, if someone doesn't know...

There is a different standard used in Usa/Canada/some-other-countries and Europe for octane rating. So, people here giving just a number like 95 or 98 are probably from Europe (or perhaps from Australia). Exact fuel names are 95E10 and 98E5 (in Finland at least) where latter number tells the percentage of ethanol. Perhaps that being reason why also my dealer said 98E, less ethanol. And I have used just that all the time. 98E equals to premium 93 and 95E is pretty close to 87.

More details about RON, MON, PON etc. fex in wiki

So, some viking saying 98 may sound pretty high for some californian gal even it actually isn't :D
 

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With the 2010 V6 Camaro, just putting in higher octane does not get immediate results. I read that the computer keeps testing the advance higher till it finds a sweet spot/area of timing for different engine loads. There for, higher octane takes a while for the computer to find the higher sweet spot and keep the tune there.

So, putting in higher octane my not get immediate results in the Sparks case either.
Not sure Sparks computer is that high tech.

I always run the higher octane in the Camaro. Also, could be my imagination but in seams to help a little. (could be that my wallet is lighter after I pay-ha)
 

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Ever since I took delivery of my Spark always used 92 octane, it's only .15 cents at 7 gallons, I also only use high quality gasoline (no arco types). I know I can use 87 I just won't.

I use a lower grade 87 on my car, and my car runs like crap, it hesitates, I use 92 it doesn't hesitate for me case closed.
 

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I run 87 in everything. If it says 87 is acceptable, that's what I run. I've never noticed a difference. I run along side my buddies spark that is paranoid and runs high test because he "Believes" it is better. Mine is neck and neck with his.
 
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