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2018 AR190 What a Difference!

Nauti-Nurse

Jet Boat Addict
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Location
Lake Lanier Georgia
Boat Make
Yamaha
Year
2018
Boat Model
AR
Boat Length
19
I am ECSTATIC! Yesterday I finished out a couple of mods/projects and I couldn't believe the results.

First off thanks to Will and crew @JetBoatPilot for the SeaDek! I love the difference from the carpet and it looks so good!

On to the really good news, @AJACHIM and I have gained a great deal of knowledge about our boats from so many helpful members of this forum, so thank you all for input along the way.
The mods I have now completed have really woken up my NA 1.8L motor. I completed the ribbon delete, why i didn't do that sooner i have no idea. As I was putting the intake back together I decided to do something we have done on most of our racing skis in the past... I completely removed the stock air box and replaced the intake with a 6" K&N intake filter. Coupled with the L13 cone that i installed at the end of last season here are my results and numbers. First off the low and mid range increase was incredibly noticeable, the rpm response was almost instantaneous. WOT RPM now 7650 and I increased my top a smidge breaking 45mph ( my weight and water conditions were Ideal with flat water,1,071ft above sea level on Lake Lanier GA., just me in the boat, half tank of fuel and no gear loaded). I am certainly impressed with these three simple yet effective mods! If you have any input and could throw me a few numbers to compare I'm all about it!
As far as the increase in the engine noise/sound i agree with others that it is a noticeable increase, but I can still hear my stereo at WOT... and besides a former jet ski racer, I love some good engine noise lol
One other thing I'm thinking about but would need some honest input first, is to cut a vent under the rear seat/engine cover and place an air scoop and screen just above where the K&N sits to really push some fresh air into the engine compartment like a ram air vent. Under the seat there are 2 channels one on each side and the starboard one is directly above the air filter. Let me know what you think.

Nauti Nurse
p.s. please excuse how dirty she is, she hasn't had her start of season full detail yet! lol
IMG_3676.jpgIMG_3677.jpegIMG_3685.jpeg
 

Mike190

Active Member
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Location
Franklin, Ga
Boat Make
Yamaha
Year
2017
Boat Model
SX
Boat Length
19
Nice waiting on my sea deck as we speak and over the past week did the ribbon delete, l13 and put a K&N filter in the factory airbox and removed the snorkel out of the air box as well. Ready for Saturday so I can try it out. 2017 sx190
 

kennetht

Jet Boat Lover
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Yamaha
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2013
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AR
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19
Whats ribbon delete?
 

Nauti-Nurse

Jet Boat Addict
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Location
Lake Lanier Georgia
Boat Make
Yamaha
Year
2018
Boat Model
AR
Boat Length
19
Whats ribbon delete?
The removal of the metal "filter" that sits just behind the air intake manifold. It is very restrictive. There are a number of great HOW TO threads on here about the removal with or without using the Riva manifold sleeve in its place.
 

Mike190

Active Member
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Location
Franklin, Ga
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Yamaha
Year
2017
Boat Model
SX
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19
Also what was your top speed before the upgrades? I'm down on west point and can only get 39mph out of mine.
 

jEt_jAk

Jetboaters Commander
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Location
SoCal
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Yamaha
Year
2018
Boat Model
AR195
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19
Also what was your top speed before the upgrades? I'm down on west point and can only get 39mph out of mine.
What year?
 

Nauti-Nurse

Jet Boat Addict
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Location
Lake Lanier Georgia
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Yamaha
Year
2018
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AR
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Also what was your top speed before the upgrades? I'm down on west point and can only get 39mph out of mine.
Before mods I topped out at 38 as well based on my phone GPS. I did the Lucky13 cone first near the end of last season and was pushing 41. Yesterday I really had ideal conditions. The lake was like glass and water temp of 67 degrees 1/2 tank of fuel and me and one life jacket in the boat. sustained speed was 44.6-44.9 and broke to 45.0 several times.
To me the cost and ease of those thee mods were well worth it. I wasn't looking for top speed, I am mostly impressed with the low and mid range response because we are into watersports and I was looking for some power while I have 2 ballast bags for surfing and foiling. The mid rage response on the turns helping to maintain speed was noticeable too and will be great for my kids while they tube.
 

Gunner

Jet Boat Junkie
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Location
Southeastern, Mass
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Yamaha
Year
2018
Boat Model
AR
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19
When I did the ribbon delete I noticed the engine noise seemed less whiny and more throaty did you notice this as well or am I just losing my mind?
 

Mike190

Active Member
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Location
Franklin, Ga
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Yamaha
Year
2017
Boat Model
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19
Before mods I topped out at 38 as well based on my phone GPS. I did the Lucky13 cone first near the end of last season and was pushing 41. Yesterday I really had ideal conditions. The lake was like glass and water temp of 67 degrees 1/2 tank of fuel and me and one life jacket in the boat. sustained speed was 44.6-44.9 and broke to 45.0 several times.
To me the cost and ease of those thee mods were well worth it. I wasn't looking for top speed, I am mostly impressed with the low and mid range response because we are into watersports and I was looking for some power while I have 2 ballast bags for surfing and foiling. The mid rage response on the turns helping to maintain speed was noticeable too and will be great for my kids while they tube.
Thanks yeah not looking for top speed as I normally just cruise at like 6k but when me and my dad are messing around maybe he wont outrun me as bad lol the main reason I did the cone was because with 4 people and a kid on it I would have cavitation if I tried to take off hard and the other stuff was to complement it.
 

Dean P

Jetboaters Admiral
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Location
Florida
Boat Make
Chaparral
Year
2017
Boat Model
VRX
Boat Length
22
The best part of the ribbon delete is when slamming the throttle to WOT, the RPMs jump straight to max RPMs and stays there. Awesome feeling and sound. As long as she doesn't cavitate she'll fly.
 

Nauti-Nurse

Jet Boat Addict
Messages
101
Reaction score
128
Points
102
Location
Lake Lanier Georgia
Boat Make
Yamaha
Year
2018
Boat Model
AR
Boat Length
19
The best part of the ribbon delete is when slamming the throttle to WOT, the RPMs jump straight to max RPMs and stays there. Awesome feeling and sound. As long as she doesn't cavitate she'll fly.
The RPM response was such a difference!
 

Dean P

Jetboaters Admiral
Messages
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Location
Florida
Boat Make
Chaparral
Year
2017
Boat Model
VRX
Boat Length
22
Here in Florida we have an issues with heat sink since the water is sooooo warm. I installed a SVHO Intercooler to help keep the engine cooler.
 

Mike190

Active Member
Messages
86
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Location
Franklin, Ga
Boat Make
Yamaha
Year
2017
Boat Model
SX
Boat Length
19
Here in Florida we have an issues with heat sink since the water is sooooo warm. I installed a SVHO Intercooler to help keep the engine cooler.
We have the n/a 1.8 so no intercooler
 

akatrauma

Jet Boat Lover
Messages
13
Reaction score
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70
Boat Make
Yamaha
Year
2014
Boat Model
SX
Boat Length
19
I have the exact same boat, I'm so glad to see your thoughts on the engine mods. We just put in the seadek and we love it!
 

Irial29

Jet Boat Addict
Messages
23
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92
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
19
I am ECSTATIC! Yesterday I finished out a couple of mods/projects and I couldn't believe the results.

First off thanks to Will and crew @JetBoatPilot for the SeaDek! I love the difference from the carpet and it looks so good!

On to the really good news, @AJACHIM and I have gained a great deal of knowledge about our boats from so many helpful members of this forum, so thank you all for input along the way.
The mods I have now completed have really woken up my NA 1.8L motor. I completed the ribbon delete, why i didn't do that sooner i have no idea. As I was putting the intake back together I decided to do something we have done on most of our racing skis in the past... I completely removed the stock air box and replaced the intake with a 6" K&N intake filter. Coupled with the L13 cone that i installed at the end of last season here are my results and numbers. First off the low and mid range increase was incredibly noticeable, the rpm response was almost instantaneous. WOT RPM now 7650 and I increased my top a smidge breaking 45mph ( my weight and water conditions were Ideal with flat water,1,071ft above sea level on Lake Lanier GA., just me in the boat, half tank of fuel and no gear loaded). I am certainly impressed with these three simple yet effective mods! If you have any input and could throw me a few numbers to compare I'm all about it!
As far as the increase in the engine noise/sound i agree with others that it is a noticeable increase, but I can still hear my stereo at WOT... and besides a former jet ski racer, I love some good engine noise lol
One other thing I'm thinking about but would need some honest input first, is to cut a vent under the rear seat/engine cover and place an air scoop and screen just above where the K&N sits to really push some fresh air into the engine compartment like a ram air vent. Under the seat there are 2 channels one on each side and the starboard one is directly above the air filter. Let me know what you think.

Nauti Nurse
p.s. please excuse how dirty she is, she hasn't had her start of season full detail yet! lol
View attachment 118948View attachment 118949View attachment 118951
Wow! Any step by step instructions out there on how to complete this? (The more remedial the instructions the better!)
I’d love to replace the air filter box alone just for the sake of how near impossible it is to winterize the boat every year
 

Mike190

Active Member
Messages
86
Reaction score
81
Points
37
Location
Franklin, Ga
Boat Make
Yamaha
Year
2017
Boat Model
SX
Boat Length
19
Wow! Any step by step instructions out there on how to complete this? (The more remedial the instructions the better!)
I’d love to replace the air filter box alone just for the sake of how near impossible it is to winterize the boat every year
You mean for spraying in oil?
 

2kwik4u

Jetboaters Fleet Admiral
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Location
Georgetown, IN
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Yamaha
Year
2017
Boat Model
AR
Boat Length
19
I have the same engine mods minus the fancy filter there.

Biggest gain for me was the consistency. Before the mods a heavy load or hot day meant a noticable hit to performance. After the mods the boat performance is the same wether I'm heavily loaded in August, or barely loaded in April. Same speed, same planing ability, same power and traction. It's just so consistent now.
 

Mike190

Active Member
Messages
86
Reaction score
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Location
Franklin, Ga
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Yamaha
Year
2017
Boat Model
SX
Boat Length
19
Ok so top speed is currently still at 39 with a full tank with the wife and myself in it so no change there so that's good and it take off like a rocket and actually made the motor bog a little in a hard turn so may end up pulling a spacer out of the cone but will have to play with it more
 

2kwik4u

Jetboaters Fleet Admiral
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Location
Georgetown, IN
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Yamaha
Year
2017
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AR
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You can tune the cone a bit to allow more RPM and not sacrifice traction. Pull a washer or two out and see how it does. That's on my list for this year is to tune in the L13. I've been running for two seasons with all the washers in and haven't messed with it.
 
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