Shimming / Needle Questions &Weirdness

Jim Moore · November 1st, 2012, 06:56 PM

Folks,

I have my carbs apart (98 Ninja 250) trying to fix some fueling issues that are kicking my butt. First I notice that my main jet needle has a c-clip and several different slots for needle height. Does that mean I have an aftermarket needle ( and probably aftermarket jets too)?

Also, as I pulled out the first needle several washers fell out. I didn't really notice what order they were in. I paid close attention on the second needle. Strangely I have two tiny washers sitting ABOVE the c-clip. That doesn't make any sense to me. If anything they should be below the c-clip, right? I mean, they're supposed to be holding the needle up.

choneofakind · November 1st, 2012, 09:49 PM

Yes, you have aftermarket needles. Free jet kit!

Factory pro recommends putting washers in a sandwich between a pair of c-clips to weight the needle a bit.

You can also use washers under the clips as sort of "half steps" between clip positions.

Check out some of the info on the jetting database discussion thread.

This might help with some of your questions:

check out this page as well:
http://faq.ninja250.org/wiki/Ninja_2...le_Information

Jim Moore · November 2nd, 2012, 02:04 AM

Thanks for the link. I was reading some of that stuff earlier.

Everything you say makes sense. What doesn't make sense it to have washers on top of a single c-clip. Right?

choneofakind · November 3rd, 2012, 09:03 AM

I don't think it's going to be an issue that the washers aren't sandwiched between clips. There's a spring on top of them.

If it makes you feel better, you can always go to a local hardware store and try to find some more clips that are identical in size and put those on top of the washers.

Jim Moore · November 3rd, 2012, 09:27 AM

Thanks again. Based on some research and discussion in the thread below, I decided to toss the shims and go down one slot on the needle. Problem solved! Hot damn!

http://www.ninjette.org/forums/showt...227#post596227

choneofakind · November 3rd, 2012, 09:27 AM

Glad it worked out for you! Looks like you solved your flat mid-range problem

November 1st, 2012, 06:56 PM	#1
Jim Moore ninjette.org member Name: Jim Location: Jax, FL Join Date: May 2012 Motorcycle(s): 2000 Ninjette, 98 CBR600, 98 VFR800, 2000 BMW R1100RS, Kymco Movie 150 Posts: 146	Shimming / Needle Questions &Weirdness Folks, I have my carbs apart (98 Ninja 250) trying to fix some fueling issues that are kicking my butt. First I notice that my main jet needle has a c-clip and several different slots for needle height. Does that mean I have an aftermarket needle ( and probably aftermarket jets too)? Also, as I pulled out the first needle several washers fell out. I didn't really notice what order they were in. I paid close attention on the second needle. Strangely I have two tiny washers sitting ABOVE the c-clip. That doesn't make any sense to me. If anything they should be below the c-clip, right? I mean, they're supposed to be holding the needle up. __________________________________________________ Jim Moore Jax, FL

November 2nd, 2012, 02:04 AM	#3
Jim Moore ninjette.org member Name: Jim Location: Jax, FL Join Date: May 2012 Motorcycle(s): 2000 Ninjette, 98 CBR600, 98 VFR800, 2000 BMW R1100RS, Kymco Movie 150 Posts: 146	Thanks for the link. I was reading some of that stuff earlier. Everything you say makes sense. What doesn't make sense it to have washers on top of a single c-clip. Right? __________________________________________________ Jim Moore Jax, FL

November 3rd, 2012, 09:27 AM	#5
Jim Moore ninjette.org member Name: Jim Location: Jax, FL Join Date: May 2012 Motorcycle(s): 2000 Ninjette, 98 CBR600, 98 VFR800, 2000 BMW R1100RS, Kymco Movie 150 Posts: 146	Thanks again. Based on some research and discussion in the thread below, I decided to toss the shims and go down one slot on the needle. Problem solved! Hot damn! http://www.ninjette.org/forums/showt...227#post596227 __________________________________________________ Jim Moore Jax, FL

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November 1st, 2012, 09:49 PM	#2
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Yes, you have aftermarket needles. Free jet kit! Factory pro recommends putting washers in a sandwich between a pair of c-clips to weight the needle a bit. You can also use washers under the clips as sort of "half steps" between clip positions. Check out some of the info on the jetting database discussion thread. This might help with some of your questions: check out this page as well: http://faq.ninja250.org/wiki/Ninja_2...le_Information

November 3rd, 2012, 09:03 AM	#4
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	I don't think it's going to be an issue that the washers aren't sandwiched between clips. There's a spring on top of them. If it makes you feel better, you can always go to a local hardware store and try to find some more clips that are identical in size and put those on top of the washers.