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What a difference .030" makes!!

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Guest

Guest
I raised the jet needles in my son's '82 GS650G up .030" and that flat spot between 3-5K disappeared!!

I should also note that I re-adjusted the mixture screws because it was running quite lean too (each screw is now out approx 2.5 - 2.75 turns)

Now you can cruise in 5th at 2700-3000 rpm, turn the throttle and actually accelerate nicely!! \\:D/

My plan is to do some plug chops & adjust from there.

I'm still smilin' though !!!! :-D
 
Did the same thing on my 850 recently and it made a very noticable difference; choke can be turned off shortly after starting now and the flat spot at partial throttle is completely gone. Highly recommended modification for all GS bikes with BS/CV carbs.:)
 
sooo..... if .030" makes a big difference, will .050 be better?? What's your experience?? The bike(s) are completely stock through & through.
 
doesn't seem it, however i still need to do plug chops to confirm
 
Hmmm maybe I will try this later. What did you use to raise the needle?
 
I always feel like the outsider, heh. I'm always fighting too rich not too lean.
 
mortation said:
Hmmm maybe I will try this later. What did you use to raise the needle?
Click to expand...

Pull out the needle and remove the plastic spacer on top of the clip.

Get a couple of small washers with a total thickness combined about 1/2 as thick as the plastic spacer.

Reassemble the needle back into the slide with washers on top of clip. Net result is you will have raised the needle about 1/2 the height of the spacer.

If you have a hard time finding washers, Radio Shack sells a bag that people report work pretty well. Failing finding the washers, stack a bunch of small washers with the right ID (but too large OD) on a screw with a nut on the end and chuck up the whole assembly is a drill motor or dremmel. Use a file to dress down the OD until it matches that of the plastic spacer you removed.

Hope this helps.
 
Nessism said:
Pull out the needle and remove the plastic spacer on top of the clip.

Get a couple of small washers with a total thickness combined about 1/2 as thick as the plastic spacer.

Reassemble the needle back into the slide with washers on top of clip. Net result is you will have raised the needle about 1/2 the height of the spacer.

If you have a hard time finding washers, Radio Shack sells a bag that people report work pretty well. Failing finding the washers, stack a bunch of small washers with the right ID (but too large OD) on a screw with a nut on the end and chuck up the whole assembly is a drill motor or dremmel. Use a file to dress down the OD until it matches that of the plastic spacer you removed.

Hope this helps.
Click to expand...

So are you saying that there are no needle clip grooves like in the VM needles. And you shim in between the clip and the plastic spacer to raise the needle.
 
Suzuki_Don said:
So are you saying that there are no needle clip grooves like in the VM needles. And you shim in between the clip and the plastic spacer to raise the needle.
Click to expand...
In the great US of A we don't get those fancy notched jet needles. EPA control freaks. :?
That's why Dynojet is making a killing!
 
Anybody ever try the 5/20 shim kits that you can get for sleds out of catalogs like Hiperf.com? This kit has shims at 0.010 increments for fine tunings between the 0.040 steps of needle adjustment. You would have to buy two twin carb kits at $8.95 each which I guess isn't too bad. Just an idea. I was going to buy one for my sled last year to mess with but I didn't get around to it. I am interested if anybody has played with these and the results that they got!!
 
Suzuki_Don said:
So are you saying that there are no needle clip grooves like in the VM needles. And you shim in between the clip and the plastic spacer to raise the needle.
Click to expand...

On CV carbs the needle height is controlled by the thickness of the spacer above the needle clip because a spring under the needle pushes it upward.
 
Nessism said:
Pull out the needle and remove the plastic spacer on top of the clip.

Get a couple of small washers with a total thickness combined about 1/2 as thick as the plastic spacer.

Reassemble the needle back into the slide with washers on top of clip. Net result is you will have raised the needle about 1/2 the height of the spacer.
Hope this helps.
Click to expand...

Just for reference. The plastic spacer measures .100". The flat washers came from RadioShack in a bag that contained 20 each of several different size washers. The next to the smallest size in the bag is the perfect size. The thickness of each washer is .023".

I used 3 washers (total thickness = .069") in lieu of the .100" spacer, for a total needle rise of .031" higher than what stock spacer gives you.

I'm going to use 2 washers (as Nessism suggests) for a total needle rise of .054" on the CV carbs I'm currently rebuilding for my new "82 GS850GL project bike.
 
You pretty much raised the needle 1/2 notch. :-D On the Dynojet needles two of those washers = one notch.
I measured
I know :-D
 
chef1366 said:
You pretty much raised the needle 1/2 notch. :-D On the Dynojet needles two of those washers = one notch.
I measured
I know :-D
Click to expand...

How much is a notch? I thought is was .040" ? I raised it .75 of a notch, another washer then would equate to 1.3 notch I guess. i love numbers!!
 
hikermikem said:
Just for reference. The plastic spacer measures .100". The flat washers came from RadioShack in a bag that contained 20 each of several different size washers. The next to the smallest size in the bag is the perfect size. The thickness of each washer is .023".

I used 3 washers (total thickness = .069") in lieu of the .100" spacer, for a total needle rise of .031" higher than what stock spacer gives you.

I'm going to use 2 washers (as Nessism suggests) for a total needle rise of .054" on the CV carbs I'm currently rebuilding for my new "82 GS850GL project bike.
Click to expand...

So then I have an 83 850GL so I would use 2 washers and no plastic spacer and just put the washers where the plastic spacer would have been?
 
mortation said:
So then I have an 83 850GL so I would use 2 washers and no plastic spacer and just put the washers where the plastic spacer would have been?
Click to expand...

Yup, that's correct. The end result is the jet needles are higher because the washers take up less space than the OEM plastic spacer.

Measure your original spacer thickness, then measure the thickness of your washers (together) - the difference between the two measurements is the amount you are raising the needles by.
 
On my recently acquired GS450 (4,000 mi.) here is what I did to tune up the "little beast" with some off line help:

Symptom – Engine running lean / bogs at idle / mid throttle positions
?[FONT=&quot] [/FONT]Pulled float bowls and cleaned pilot jets – found caked dirt in jets - helped 5%
?[FONT=&quot] [/FONT]Installed air filter (none installed) – pre-oiled from factory – helped 5%
?[FONT=&quot] [/FONT]Pulled slides and swapped needle washers – put white thick below clip & thin steel above – helped 20%
?[FONT=&quot] [/FONT]Pulled idle mixture epoxy plugs & adjusted fuel screws – no highest idle, so turned in until lower RPM, then out ? turn – helped 10%; however, mid range feels slightly less – 5%?
?[FONT=&quot] [/FONT]Checked carb synch – Found to be equal vacuum readings


I'm thinking I might add another steel washer on top of the clip to get the last 5% back...also getting an occasional popping through the carb during multiple downshifts coming to a stop (slightly rich?).

Still have not replaced the inlet o-rings, or checked the float height...too busy riding and :)
 
Radio Shack (now called The Source/Circuit City up here) no longer carries this part I was told today, when I went there armed with the part # (64-3022). Anyone have a washer handy to post the dimensions...just need I.D. and O.D......from the title, I gather the thickness is .030.
Thanks!
Tony.
 
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