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Replacing Stock Air Filters with K & N Oval Filters

Mike Clark

Well-Known Member
Messages
47
Reaction score
23
Points
57
Location
Germantown, ohio
Boat Make
Yamaha
Year
2015
Boat Model
SX
Boat Length
24
So I have read numerous threads about air filter replacement. Mine were original (2015 - 1.8 Liter) and after looking at them during maintenance, decided to replace them. I also noticed some oil blowby from the crank case vent hose where it returns to intake in the rubber adapter from the filter housing to the intake, not much, but just enough that I didn't like it

Although the Riva replacements for the stock airbox are nice, and are quick and easy to do, they are expensive. So after measuring the general area after the stock air boxes were removed. I decided to go with the K & N RU-1540 Oval filters. Their website is cool, in that you can enter in the I.D. Opening, length, width, flange length. etc and perform a search that meets that criteria.

So the filters are 2- 3/4 ID opening, 4.0" wide, 6 -1/4" Tall and 6.0" long. I picked this size as it is a little more in surface area than the stock filter, and the flange is angled at 10 degrees which has a longer flange on one side to clear the casting on the left side of inlet. Perfect fit.
I believe a lot of excessive intake noise is when the replacement filters have a significantly smaller surface area than stock and as such creates the excessive sucking of air trying to fulfill the needs of the engine. At least that's my theory , (probably B.S.)

I then puchased an 3 port oil catch can from e-bay for $15.00 (really nice, have no idea how thay can make them for so cheap) which comes with the exhaust filter on the 3rd port and drain cockpit on the bottom for easy draining. Re-routed the hoses onto each of the other 2 ports and mounted.

The filters are are $56.00 each and the catch can $15.00 so about $127.00 for everything. Like every body has mentioned, do not expect any performance gains, but it eliminates purchasing future filters and no more oil residue going into throttle body. And I can't leave anything stock. It a Sickness!
 

Rickytrz

Active Member
Messages
12
Reaction score
14
Points
32
Boat Make
Yamaha
Year
2018
Boat Model
242 Limited E-Series
Boat Length
24
Hi Mike did you took some pictures for that upgrade?
By the way I have the same sickness too :winkingthumbsup"
 

shar

Active Member
Messages
43
Reaction score
86
Points
27
Location
ATX
Boat Make
Yamaha
Year
2019
Boat Model
AR
Boat Length
24
subbed. I have been toying around with the idea of doing something similar. Interested to see your setup.

Thanks for sharing!
 
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