K&N Filter Mod for M50 - Motorcycle-Journal Forums

Breeze · 09-27-2006, 10:35 AM

This mod uses a K&N R1390 filter, about $35 + shipping. I hacked out the old element. I took a razor knife to it and used snips on the metal perforated innerds. The intake hole is about 2". I got a 1.5" No Hub Coupler form the plumbing dept @ Home Depot for about $2 . It has a 2" rubber coupling inside it. I discarded the outer clamp and the rubber fit the hole perfectly. I then cut it down to about 1.5" long and fit it in the intake hole and used Black RTV gasket maker to seal it up. I let it cure overnight. The K&N filter flange fits perfecty around the rubber and it has a metal screw type clamp to secure it. It is rubber to rubber contact so you don't have to put the kabotch to it, just tight enough will do. I had already modified the stock airbox, cutting out about a 8" X 1.5" section from the bottom of the plastichrome cover. I then epoxied a sheet of sanding screen inside to help keep out flying critters and such. I also pulled out the rubber elbow and plugged up the original intake hole with gaffers tape. I have a Techlusion TFi installed and my pipes are gutted stock (no restrictors). This bike now rides like a beast compared to stock. It pulls a lot harder now and I think it is probably doing 0 to 60 in under 5 sec. now. LOVE it!!!!

Breeze · 09-27-2006, 10:36 AM

More pics

dragbar · 09-27-2006, 10:37 AM

Sounds like a winner.

TrOjAnUK · 09-27-2006, 12:11 PM

Breeze,

Nice one.. can you tell me what the K&N air filter is supposed to fit?? I tried searching for that part number but comes back with some weird stuff.

Definatly one I want to try.. any more information you can give on the air filter itself would be great.

TrOjAn

Breeze · 09-27-2006, 02:30 PM

I found it on the site under Universal filters. I was basically looking for one that was similar in dimensions to the stock element. It came with an instruction sheet for a Yamaha YZ 80. Go figure! I realize that the M50 has 10 X's the displacement of a YZ80, but this filter let's so much more air in than the stock element. You may be able to fit a slightly larger one in there, but it will be tight. I am real happy with the performance.

TrOjAnUK · 09-27-2006, 02:50 PM

Thanks breeze, just ebayed ober here in UK and this is what comes back eBay.co.uk: K&N High Flow Air Filter Yamaha YZ80/YZ/80 1993-2001 (item 270009865037 end time 18-Oct-06 11:54:13 BST)

Is that the same??

Cheers

TrOjAn

Breeze · 09-27-2006, 04:57 PM

Quote:

Originally Posted by TrOjAnUK

Thanks breeze, just ebayed ober here in UK and this is what comes back eBay.co.uk: K&N High Flow Air Filter Yamaha YZ80/YZ/80 1993-2001 (item 270009865037 end time 18-Oct-06 11:54:13 BST)

Is that the same??

Cheers

TrOjAn

No that one is too tall. The R-1390 that I got is for a 1982 YZ80. Here are some links to the K&N site:
K&N High Performance Air Filters, Oil Filters, & Cold Air Intakes - Official K&N Engineering Site
K&N Universal Clamp-on Air Filters for a Variety of Universal Air Filter Applications
K&N Universal Oval Straight Air Filters
http://www.knfilters.com/search/prod...px?Prod=R-1390

This one may work also:
http://www.knfilters.com/search/prod...x?Prod=RA-0710
You can buy direct from K&N but I don't know how high shipping would be to the UK.

TrOjAnUK · 11-06-2006, 10:44 AM

Holy Cow.. that R-1390 is 85$ to buy here inn the UK.

What a difference

TrOjAn

Merritt Island M50 · 11-06-2006, 12:22 PM

Quote:

Originally Posted by TrOjAnUK

Holy Cow.. that R-1390 is 85$ to buy here inn the UK.

What a difference

TrOjAn

wow

09-27-2006, 10:35 AM	#1 (permalink)
Breeze Kickstand Operator Joined: Dec 2005 Bike: '05 Blue M50 w/Black Flames Location: Indian Trail, NC Posts: 278	K&N Filter Mod for M50 This mod uses a K&N R1390 filter, about $35 + shipping. I hacked out the old element. I took a razor knife to it and used snips on the metal perforated innerds. The intake hole is about 2". I got a 1.5" No Hub Coupler form the plumbing dept @ Home Depot for about $2 . It has a 2" rubber coupling inside it. I discarded the outer clamp and the rubber fit the hole perfectly. I then cut it down to about 1.5" long and fit it in the intake hole and used Black RTV gasket maker to seal it up. I let it cure overnight. The K&N filter flange fits perfecty around the rubber and it has a metal screw type clamp to secure it. It is rubber to rubber contact so you don't have to put the kabotch to it, just tight enough will do. I had already modified the stock airbox, cutting out about a 8" X 1.5" section from the bottom of the plastichrome cover. I then epoxied a sheet of sanding screen inside to help keep out flying critters and such. I also pulled out the rubber elbow and plugged up the original intake hole with gaffers tape. I have a Techlusion TFi installed and my pipes are gutted stock (no restrictors). This bike now rides like a beast compared to stock. It pulls a lot harder now and I think it is probably doing 0 to 60 in under 5 sec. now. LOVE it!!!! Attached Thumbnails Last edited by Breeze; 09-27-2006 at 10:41 AM.

09-27-2006, 10:36 AM	#2 (permalink)
Breeze Kickstand Operator Joined: Dec 2005 Bike: '05 Blue M50 w/Black Flames Location: Indian Trail, NC Posts: 278	More pics Attached Thumbnails

09-27-2006, 10:37 AM	#3 (permalink)
dragbar Fifth gear streak Joined: May 2005 Bike: M50 Location: SE Missouri Posts: 1,375	Sounds like a winner. __________________ I ate Chinese last night..........should of seen her struggle when i put her in the van. Доверя́й, но проверя́й.

09-27-2006, 02:30 PM	#5 (permalink)
Breeze Kickstand Operator Joined: Dec 2005 Bike: '05 Blue M50 w/Black Flames Location: Indian Trail, NC Posts: 278	I found it on the site under Universal filters. I was basically looking for one that was similar in dimensions to the stock element. It came with an instruction sheet for a Yamaha YZ 80. Go figure! I realize that the M50 has 10 X's the displacement of a YZ80, but this filter let's so much more air in than the stock element. You may be able to fit a slightly larger one in there, but it will be tight. I am real happy with the performance. Last edited by Breeze; 09-27-2006 at 02:45 PM.

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09-27-2006, 12:11 PM	#4 (permalink)
TrOjAnUK Ditch Magnet Joined: Aug 2006 Posts: 180	Breeze, Nice one.. can you tell me what the K&N air filter is supposed to fit?? I tried searching for that part number but comes back with some weird stuff. Definatly one I want to try.. any more information you can give on the air filter itself would be great. TrOjAn

09-27-2006, 02:50 PM	#6 (permalink)
TrOjAnUK Ditch Magnet Joined: Aug 2006 Posts: 180	Thanks breeze, just ebayed ober here in UK and this is what comes back eBay.co.uk: K&N High Flow Air Filter Yamaha YZ80/YZ/80 1993-2001 (item 270009865037 end time 18-Oct-06 11:54:13 BST) Is that the same?? Cheers TrOjAn

11-06-2006, 10:44 AM	#8 (permalink)
TrOjAnUK Ditch Magnet Joined: Aug 2006 Posts: 180	Holy Cow.. that R-1390 is 85$ to buy here inn the UK. What a difference TrOjAn

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