The Fishing Website : Discussion Forums : New Yamaha 115HP Saltwater Series https://www.fishing.net.nz/forum/ Fri, 29 May 2026 06:22:30 +0000 Sat, 19 Sep 2015 20:23:55 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.01 360 https://www.fishing.net.nz/forum/RSS_post_feed.asp?TID=112316 <![CDATA[The Fishing Website : Discussion Forums]]> https://www.fishing.net.nz/forum/forum_images/web_wiz_forums.png https://www.fishing.net.nz/forum/ <![CDATA[New Yamaha 115HP Saltwater Series : thanks for all the great advice...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586234&title=new-yamaha-115hp-saltwater-series#1586234 Author: stone2
Subject: 112316
Posted: 19 Sep 2015 at 8:23pm

thanks for all the great advice people. Feel better now. Big smile
]]> Sat, 19 Sep 2015 20:23:55 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586234&title=new-yamaha-115hp-saltwater-series#1586234 <![CDATA[New Yamaha 115HP Saltwater Series : Grasshoppa wrote:When i done...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586111&title=new-yamaha-115hp-saltwater-series#1586111 Author: MacSkipper
Subject: 112316
Posted: 19 Sep 2015 at 7:24am

Originally posted by Grasshoppa Grasshoppa wrote:

When i done my time, i was taught that yes,Octane , is basically a anti-knock index or rating (amongst some other things)
Pre-ignition or detonation which is absolutely terminal to 2 stroke engines is caused by either too high compression, too much spark advance or poor quality/therefore lower rated fuel.
In the first case, the higher the octane rating of the fuel you have sitting in your tank slowly deteriorating, the more "octane" it has to lose the longer it has before its "stale" enough to potentially cause a problem.
If you think the boat may sit unused for any period of time either completely fill the tank (no or less space for the volatile 'light ends" to evaporate off too), or completely empty so less fuel to get to stale stage.
When boat is used first time, fill tank with highest grade you can to mix with old and give a better average octane rating across current and new fuel.
If boats been used daily and engine is rated for 91 its ok too as your getting thru the fuel before it can go stale, bit more affordable for some doing this

Dont mean to sidetrack but i'll get on my soapbox here and have a crack at those who bleat on this forum about mechanics/costs of servicing and how they purchased sparkplugs and a filter and done the "service" themselves, its basic fundamentals like understanding why different fuels (other than just "cos my mate said i should") amongst other things.

Its not only what a trained service tech does, but hopefully what they see/recognize and resolve before its an issue that lets them charge a hopefully only modest fee
Rant over, sorry

Fouling is often caused by the additives used to boost a fuels rating, good old lead was a vastly superior fuel which lasted much longer, if you can get aviation fuel at a decent price thats the way to go, but is usually prohibitively expensive
Pity the yanks who get ethanol in a lot of their full (as do Gull here), that stuff melts certain plastics/rubbers etc and they have dissolving fuelines etc to deal with, not as much a problem as before but something else they have to deal with

Thanks Grasshoppa makes a lot of sense Clap.
]]> Sat, 19 Sep 2015 07:24:12 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586111&title=new-yamaha-115hp-saltwater-series#1586111 <![CDATA[New Yamaha 115HP Saltwater Series : oh yeah, the outboard your considering...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586110&title=new-yamaha-115hp-saltwater-series#1586110 Author: Grasshoppa
Subject: 112316
Posted: 19 Sep 2015 at 7:16am

oh yeah, the outboard your considering is a great engineSmile, ]]> Sat, 19 Sep 2015 07:16:03 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586110&title=new-yamaha-115hp-saltwater-series#1586110 <![CDATA[New Yamaha 115HP Saltwater Series : When i done my time, i was taught...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586109&title=new-yamaha-115hp-saltwater-series#1586109 Author: Grasshoppa
Subject: 112316
Posted: 19 Sep 2015 at 7:14am

When i done my time, i was taught that yes,Octane , is basically a anti-knock index or rating (amongst some other things)
Pre-ignition or detonation which is absolutely terminal to 2 stroke engines is caused by either too high compression, too much spark advance or poor quality/therefore lower rated fuel.
In the first case, the higher the octane rating of the fuel you have sitting in your tank slowly deteriorating, the more "octane" it has to lose the longer it has before its "stale" enough to potentially cause a problem.
If you think the boat may sit unused for any period of time either completely fill the tank (no or less space for the volatile 'light ends" to evaporate off too), or completely empty so less fuel to get to stale stage.
When boat is used first time, fill tank with highest grade you can to mix with old and give a better average octane rating across current and new fuel.
If boats been used daily and engine is rated for 91 its ok too as your getting thru the fuel before it can go stale, bit more affordable for some doing this

Dont mean to sidetrack but i'll get on my soapbox here and have a crack at those who bleat on this forum about mechanics/costs of servicing and how they purchased sparkplugs and a filter and done the "service" themselves, its basic fundamentals like understanding why different fuels (other than just "cos my mate said i should") amongst other things.

Its not only what a trained service tech does, but hopefully what they see/recognize and resolve before its an issue that lets them charge a hopefully only modest fee
Rant over, sorry

Fouling is often caused by the additives used to boost a fuels rating, good old lead was a vastly superior fuel which lasted much longer, if you can get aviation fuel at a decent price thats the way to go, but is usually prohibitively expensive
Pity the yanks who get ethanol in a lot of their full (as do Gull here), that stuff melts certain plastics/rubbers etc and they have dissolving fuelines etc to deal with, not as much a problem as before but something else they have to deal with

]]> Sat, 19 Sep 2015 07:14:50 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586109&title=new-yamaha-115hp-saltwater-series#1586109 <![CDATA[New Yamaha 115HP Saltwater Series : Muzzfishing wrote: CoastalStan...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586105&title=new-yamaha-115hp-saltwater-series#1586105 Author: MacSkipper
Subject: 112316
Posted: 19 Sep 2015 at 5:59am

Originally posted by Muzzfishing Muzzfishing wrote:

Originally posted by CoastalStan CoastalStan wrote:

Great engines but always run it on 98 if you can.
Just curious as to why you say run on 98 octane fuel is there any advantages over running 91fuel.
I am not exactly sure as why higher Octane rating is better as Octane is an anti knock rating not to do with volatiles as such in fuel - but my mechanic said same thing - when I asked him why he said is a better quality fuel and he has seen it fouls plugs less on my Mercury 50hp 2S. 
]]> Sat, 19 Sep 2015 05:59:52 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586105&title=new-yamaha-115hp-saltwater-series#1586105 <![CDATA[New Yamaha 115HP Saltwater Series : CoastalStan wrote:I had a few...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586071&title=new-yamaha-115hp-saltwater-series#1586071 Author: Muzzfishing
Subject: 112316
Posted: 18 Sep 2015 at 7:30pm

Originally posted by CoastalStan CoastalStan wrote:

I had a few issues with the first one I owned, gradually got harder to start and occasionally would just got Barrrrrrr when you gassed it. Drained the fuel and cleaned out the carbs and all good for a while. Mechanic advised me to stop running it on 91 and change to 95 and 98 if possible. Once I change to 98 never had a problem. Didn't notice any change to $ per mile and if you didn't use it for a couple of months it started first pop and ran like a dream. I think his theory was that the octane rating drops as it gets older, better to start with 98 and it drops to 93 that 91 dropping to 86. I don't know exactly but it reduced my maintenance costs and ran much better.
 
Thanks I have read some where that if leaving petrol in tanks for long periods its better to leave a higher octane petrol than lower octane petrol. 
]]> Fri, 18 Sep 2015 19:30:45 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586071&title=new-yamaha-115hp-saltwater-series#1586071 <![CDATA[New Yamaha 115HP Saltwater Series : I had a few issues with the first...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586068&title=new-yamaha-115hp-saltwater-series#1586068 Author: CoastalStan
Subject: 112316
Posted: 18 Sep 2015 at 7:23pm

I had a few issues with the first one I owned, gradually got harder to start and occasionally would just got Barrrrrrr when you gassed it. Drained the fuel and cleaned out the carbs and all good for a while. Mechanic advised me to stop running it on 91 and change to 95 and 98 if possible. Once I change to 98 never had a problem. Didn't notice any change to $ per mile and if you didn't use it for a couple of months it started first pop and ran like a dream. I think his theory was that the octane rating drops as it gets older, better to start with 98 and it drops to 93 that 91 dropping to 86. I don't know exactly but it reduced my maintenance costs and ran much better.]]> Fri, 18 Sep 2015 19:23:24 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586068&title=new-yamaha-115hp-saltwater-series#1586068 <![CDATA[New Yamaha 115HP Saltwater Series : CoastalStan wrote:Great engines...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586057&title=new-yamaha-115hp-saltwater-series#1586057 Author: Muzzfishing
Subject: 112316
Posted: 18 Sep 2015 at 6:53pm

Originally posted by CoastalStan CoastalStan wrote:

Great engines but always run it on 98 if you can. Make sure you have a good filter as they don't like water in the carbs. Always flush for at least 10 mins as the thermostat doesn't open for at least 5 mins. They don't like stale fuel.
Just curious as to why you say run on 98 octane fuel is there any advantages over running 91fuel.
]]> Fri, 18 Sep 2015 18:53:38 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1586057&title=new-yamaha-115hp-saltwater-series#1586057 <![CDATA[New Yamaha 115HP Saltwater Series : I got a 90 Yammy of the Team at...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1585926&title=new-yamaha-115hp-saltwater-series#1585926 Author: lemmy
Subject: 112316
Posted: 18 Sep 2015 at 5:37am

I got a 90 Yammy of the Team at Benseman a few months ago could,nt fault the job they did great guys to deal with.

]]> Fri, 18 Sep 2015 05:37:33 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1585926&title=new-yamaha-115hp-saltwater-series#1585926 <![CDATA[New Yamaha 115HP Saltwater Series : Great engines but always run it...]]> https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1585913&title=new-yamaha-115hp-saltwater-series#1585913 Author: CoastalStan
Subject: 112316
Posted: 17 Sep 2015 at 10:46pm

Great engines but always run it on 98 if you can. Make sure you have a good filter as they don't like water in the carbs. Always flush for at least 10 mins as the thermostat doesn't open for at least 5 mins. They don't like stale fuel. ]]> Thu, 17 Sep 2015 22:46:53 +0000 https://www.fishing.net.nz/forum/forum_posts.asp?TID=112316&PID=1585913&title=new-yamaha-115hp-saltwater-series#1585913