Difference between Genuine and OEM EQUIVALENT for Keihin ?

tac12345 · February 6th, 2011, 12:06 PM

Anyone know the difference ?

DaBlue1 · February 6th, 2011, 12:54 PM

What parts are you referring to by Keihin?
Keihin makes automotive systems, air and fuel management systems, HVAC systems and electronic control systems.

Most companies that make, design, and market there own product usually label them "genuine". However that same company may contract or license another company(ies) to make the same product under similar production guidelines with slight design changes and production number limits. This would more likely be something labeled as an OEM equivalent.

tac12345 · February 6th, 2011, 12:55 PM

its regarding main & pilot jet ; http://jetsrus.com/a_jet_kit_street/...50R_Ninja.html

DaBlue1 · February 6th, 2011, 01:25 PM

Those jets may be made by several different companies, but do the same thing as one made by Keihin.

kkim · February 6th, 2011, 01:28 PM

Genuine Keihin parts (or any other branded manufacturer parts) specify to their supplier the specs which the parts must be built in order for the manufacturer to put their name on it. You can be assured there is some degree of quality control if a manufacturer is putting their name/reputation/warranty on it.

OEM equivalent parts (not only with motorcycles, but with any parts supplier for any type of bike, car, washing machine, carburetors, etc.), build their parts to their specs and while it may be as good or better than genuine branded parts, sometimes (many times) they are not.

As in the case of jets, I now try to purchase only Genuine Keihin jets after I had some equivalent jets snap on me. The brass they used seemed a lot softer and the threading seems to hold up a bit better on the genuine parts. Not an issue if you change the jets only once and don't break them in that process, but I have quite a collection of jets from throughout the years and I'm even surprised when I look in my jetting case and find jets from years ago that I can use for a present day application. In that case, I'm glad to have genuine parts on hand.

Jets are basically pieces of brass with a precision sized hole drilled through them. My real issue with equivalent jets is, how much "quality control" went into drilling a precise sized hole that is the real value of the jet. For a few bucks more per jet, I try to stick with genuine when I can.

On the other hand, I have had a brand new NGK spark plug break on me when installing it due to weakness at the neck (no, I didn't over tighten them), so buying name brand doesn't always assure you a trouble free part.

tac12345 · February 6th, 2011, 01:30 PM

Thanks you DaBlue1 & kkim

Genuine all the way

tac12345 · February 6th, 2011, 01:55 PM

last question, when you buy from jetsrus, do they ship a pair or you have to put your quantity to 2 to get 2 jet of the same size ?

kkim · February 6th, 2011, 02:05 PM

Quote:

Originally Posted by tac12345

last question, when you buy from jetsrus, do they ship a pair or you have to put your quantity to 2 to get 2 jet of the same size ?

http://jetsrus.com/a_jet_kit_street/...50R_Ninja.html

top of the listing says "price each".

tac12345 · February 6th, 2011, 02:06 PM

Quote:

Originally Posted by kkim

http://jetsrus.com/a_jet_kit_street/...50R_Ninja.html

top of the listing says "price each".

hehe thanks

Jinx250 · February 7th, 2011, 10:28 AM

They are for "each" and I more than gladly pay less for 2 of the OEM equivalent than the full price for 1 "genuine". Under normal conditions, there should be little to no issues. KKim must be monstrously strong to have broken a jet.

kkim · February 7th, 2011, 11:42 AM

Quote:

Originally Posted by Jinx250

KKim must be monstrously strong to have broken a jet.

nope, it's over repeated installations of the same jet that problem/weakness occurred. Who knows what quality of brass was used for the jets?

BTW, jets are relatively easy to break.

indr · February 8th, 2011, 03:56 PM

The higher the number of the jet, the bigger the hole on the walls of the tube?

Does the number represent anything? Like the dimension of the hole?

What are the numbers of the stock pilot and main jets?

I'd go up or down in number from stock if I put on an aftermarket air filter (pods/k&n)?

The same thing can be accomplished with washers, tho will much less accuracy?

HKr1 · February 9th, 2011, 02:46 PM

Quote:

Originally Posted by indrish

The same thing can be accomplished with washers, tho will much less accuracy?

No......

indr · February 9th, 2011, 07:23 PM

No to the first or to the second part of the question?

Dangler Action · January 28th, 2013, 11:47 AM

You can't simply allow more fuel to go in to the engine if you are still using too small of a main jet. The stock size is 105 on the pre-gen Ninja and I believe it's the same on the 2008+. The main jets go in sizes 108, 110, 112, 115, 118... Keihin Main Jets

I would also try buying the OEM Equivalent just because I know I might have to buy more than one pair just to find the right tuning.

On my bike I have a Muzzy full exhaust system and I just ordered a K&N Air Filter from AutoZone [R-0990]. A sweet deal for just $36!

I had 110's for my exhaust and now I'm going up to 112 for the air filter. Maybe even the 115.

Quote:

Originally Posted by indr

No to the first or to the second part of the question?

Racer x · January 28th, 2013, 02:38 PM

2008 bikes come with 98 mains.

Only use genuine Keihin jets

choneofakind · January 28th, 2013, 07:35 PM

Quote:

Originally Posted by Dangler Action

The stock size is 208 on the pre-gen Ninja and I believe it's the same on the 2008+.

Pregen stock main: 105

newgen stock main: 98

PS, I love my Muzzy and R-0990 combo. I just don't like how loud the R-0990 is under WOT.

agentbad · June 24th, 2013, 02:51 PM

Okay this thread is very helpful for me since I am about to rejet my 05 ninja and was wondering where to get the #4 washers to shim the needles? I am sure lowes has them I just want to make sure I get the right ones.

choneofakind · June 24th, 2013, 03:24 PM

They're about 3mm ID, about 6mm OD, and about 0.5mm thick. Just look for washers that are that size.

February 6th, 2011, 12:06 PM	#1
tac12345 ninjette.org member Name: Alexandre Location: Montreal Join Date: Jul 2009 Motorcycle(s): Ninja 250r 09 SE Posts: 172	Difference between Genuine and OEM EQUIVALENT for Keihin ? Anyone know the difference ?

January 28th, 2013, 02:38 PM	#16
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	2008 bikes come with 98 mains. Only use genuine Keihin jets __________________________________________________ Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja

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February 6th, 2011, 12:54 PM	#2
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	What parts are you referring to by Keihin? Keihin makes automotive systems, air and fuel management systems, HVAC systems and electronic control systems. Most companies that make, design, and market there own product usually label them "genuine". However that same company may contract or license another company(ies) to make the same product under similar production guidelines with slight design changes and production number limits. This would more likely be something labeled as an OEM equivalent.

February 6th, 2011, 12:55 PM	#3
tac12345 ninjette.org member Name: Alexandre Location: Montreal Join Date: Jul 2009 Motorcycle(s): Ninja 250r 09 SE Posts: 172	its regarding main & pilot jet ; http://jetsrus.com/a_jet_kit_street/...50R_Ninja.html

February 6th, 2011, 01:25 PM	#4
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	Those jets may be made by several different companies, but do the same thing as one made by Keihin.

February 6th, 2011, 01:28 PM	#5
kkim Join Date: Nov 2008 Posts: Too much.	Genuine Keihin parts (or any other branded manufacturer parts) specify to their supplier the specs which the parts must be built in order for the manufacturer to put their name on it. You can be assured there is some degree of quality control if a manufacturer is putting their name/reputation/warranty on it. OEM equivalent parts (not only with motorcycles, but with any parts supplier for any type of bike, car, washing machine, carburetors, etc.), build their parts to their specs and while it may be as good or better than genuine branded parts, sometimes (many times) they are not. As in the case of jets, I now try to purchase only Genuine Keihin jets after I had some equivalent jets snap on me. The brass they used seemed a lot softer and the threading seems to hold up a bit better on the genuine parts. Not an issue if you change the jets only once and don't break them in that process, but I have quite a collection of jets from throughout the years and I'm even surprised when I look in my jetting case and find jets from years ago that I can use for a present day application. In that case, I'm glad to have genuine parts on hand. Jets are basically pieces of brass with a precision sized hole drilled through them. My real issue with equivalent jets is, how much "quality control" went into drilling a precise sized hole that is the real value of the jet. For a few bucks more per jet, I try to stick with genuine when I can. On the other hand, I have had a brand new NGK spark plug break on me when installing it due to weakness at the neck (no, I didn't over tighten them), so buying name brand doesn't always assure you a trouble free part.

February 6th, 2011, 01:30 PM	#6
tac12345 ninjette.org member Name: Alexandre Location: Montreal Join Date: Jul 2009 Motorcycle(s): Ninja 250r 09 SE Posts: 172	Thanks you DaBlue1 & kkim Genuine all the way

February 6th, 2011, 01:55 PM	#7
tac12345 ninjette.org member Name: Alexandre Location: Montreal Join Date: Jul 2009 Motorcycle(s): Ninja 250r 09 SE Posts: 172	last question, when you buy from jetsrus, do they ship a pair or you have to put your quantity to 2 to get 2 jet of the same size ?

February 7th, 2011, 10:28 AM	#10
Jinx250 Smoker Name: Bob Location: SoCal Join Date: Dec 2010 Motorcycle(s): Guess.... Posts: 556	They are for "each" and I more than gladly pay less for 2 of the OEM equivalent than the full price for 1 "genuine". Under normal conditions, there should be little to no issues. KKim must be monstrously strong to have broken a jet.

February 8th, 2011, 03:56 PM	#12
indr ninjette.org guru Name: . Location: . Join Date: Nov 2010 Motorcycle(s): . Posts: 331	The higher the number of the jet, the bigger the hole on the walls of the tube? Does the number represent anything? Like the dimension of the hole? What are the numbers of the stock pilot and main jets? I'd go up or down in number from stock if I put on an aftermarket air filter (pods/k&n)? The same thing can be accomplished with washers, tho will much less accuracy?

February 9th, 2011, 07:23 PM	#14
indr ninjette.org guru Name: . Location: . Join Date: Nov 2010 Motorcycle(s): . Posts: 331	No to the first or to the second part of the question?

June 24th, 2013, 02:51 PM	#18
agentbad ninjette.org sage Name: bob Location: Earf Join Date: Apr 2013 Motorcycle(s): 2005 Ninja 250, 2006 SV650N Posts: 642	Okay this thread is very helpful for me since I am about to rejet my 05 ninja and was wondering where to get the #4 washers to shim the needles? I am sure lowes has them I just want to make sure I get the right ones.

June 24th, 2013, 03:24 PM	#19
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	They're about 3mm ID, about 6mm OD, and about 0.5mm thick. Just look for washers that are that size.