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General Category >> Rubber Side Down! >> Lifting the needle
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Message started by Eddie Picasso on 08/05/16 at 16:48:44

Title: Lifting the needle
Post by Eddie Picasso on 08/05/16 at 16:48:44

Sometime in the past week or so I noticed in one of the topics a mention of 'Lifting the needle trick', referring to quite literally lifting the needle in the carb. Now I can't find the reference anywhere, but also I don't know the trick. I lifted my needle up to the highest setting, but am curiuos to know what this extra technique may be. Anyone?

Title: Re: Lifting the needle
Post by norm92de on 08/05/16 at 16:57:09

How did you lift the needle?

The accepted method is to shave the plastic washer under the plate that holds the needle in place. The standard plastic washer is .110" thick. Number 4 washers fit the needle so that if you shave off too much you can put one or more of these washers in place to adjust the needle as needed.

Hope this helps.

Title: Re: Lifting the needle
Post by verslagen1 on 08/05/16 at 17:49:37

Tech section index
look for white spacer mod

Title: Re: Lifting the needle
Post by Kris01 on 08/05/16 at 18:22:25

You don't want to lift it by much. What's your altitude? The needle controls, roughly, 1/2 throttle to 3/4 throttle, give or take. It's probably the most noticeable part of rejetting the carb.

Title: Re: Lifting the needle
Post by norm92de on 08/06/16 at 07:33:48

While we are talking about the carb. Has anybody come up with a replacement needle with multiple slots for the clip? It would make it a lot easier to fine tune. From what I have been able to glean a Mikuni standard slot width is .035" (.9mm). I'm sure there are needles out there but if the replacement is not a good match we could cause more trouble than it is worth.

Title: Re: Lifting the needle
Post by verslagen1 on 08/06/16 at 09:38:57

I think the dynajet needle is slotted.
You still need to space between slots.

Title: Re: Lifting the needle
Post by pyke13 on 08/09/16 at 10:39:37

i had mine apart today and theres 3 positions for a cir-clip on the top of the needle, is this what your looking for??

Title: Re: Lifting the needle
Post by norm92de on 08/09/16 at 11:30:53

On my carb there is no provision for raising the needle. Only a single groove. Your card was probably modified by someone.

Title: Re: Lifting the needle
Post by Dave on 08/09/16 at 11:38:52

2829342B7F742223460 wrote:

On my carb there is no provision for raising the needle. Only a single groove. Your card was probably modified by someone.

The stock needle does not have any slots...the EPA does not want you changing anything! The DYNAJET kit provides a needle with a moveable clip.....but their kits have different jet numbers....there is a table somewhere that compares the numbers. There really isn't a lot of advantage to having the adjustable needle....you can accomplish the same thing a lot cheaper by just replacing the white spacer with a few #4 machine screw washers.......3 is a good starting point and it cures most of the lean surge just off idle - while some require 2 washers for a little bit richer mixture

Title: Re: Lifting the needle
Post by LANCER on 08/09/16 at 16:08:53

carbs from the 80's often have a needle with 3 slots

Title: Re: Lifting the needle
Post by Kris01 on 08/09/16 at 16:44:44

Suzi changed the needle design at some point. The older ones are slotted.

Title: Re: Lifting the needle
Post by pyke13 on 08/10/16 at 13:41:37

that explains mine then, its a 1989 bike

Title: Re: Lifting the needle
Post by Kris01 on 08/10/16 at 18:15:48

Yep, that splains it!

Title: Re: Lifting the needle
Post by Danero on 08/21/16 at 04:09:01

Hi, Danero here from Australia, I just purchased 2016 model and went to do spacer mod when I noticed my needle has a clip with three grooves!
Do I just put clip on lowest groove and thats it or do I fiddle with plastic spacer(has both)

Title: Re: Lifting the needle
Post by Dave on 08/21/16 at 04:46:15

75505F54435E310 wrote:

What groove was the clip in when you took it apart?

Did your bike have a surge at low throttle settings? When accelerating slowly did the bike pull unevenly? Raising the needle provides a richer fuel mix from about 1/8 throttle to about 1/2 throttle....and if your bike runs fine in that range you may not need to raise the needle.

Title: Re: Lifting the needle
Post by Danero on 08/21/16 at 05:50:22

Sorry should have mentioned I am about to install dyna muffler. Clip is on middle of three grooves. Just asking because one groove lower is not as much as half spacer mod.

Title: Re: Lifting the needle
Post by Dave on 08/21/16 at 07:38:38

It is always a trial and error thing...what is right for one bike won't always be right for another one.

If you feel the bike surge when you install the DYNA....then jetting is necessary. If the surging is at low throttle settings try moving the clip one notch to raise the needle.