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Jetting Helper
- kzz1p
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14 Sep 2009 21:44 - 14 Sep 2009 22:09 #321721
by kzz1p
Jetting Helper was created by kzz1p
This is something I learned years ago and I still use it.
This is a little "Helper" for jetting carbs. It is a simple scale, that will help you determine what circuit, your carbs are on, when your problems arise.
We know carbs have sereval circuits and some overlap each other. It's hard to ask for help or fix it, if you don't know when the problem occurs, or the throttle position.
This is a simple tool that you can make in about two minutes. It will help you to know what circuit, your carbs are on.
All you need:
1" piece of masking tape.
3" piece of masking tape.
A Sharpie or Pen.
I am posting some pics, because I'm not a good writer.
The first is what the whole thing should look like, when finished. Then I will try to go step by step.
This is a little "Helper" for jetting carbs. It is a simple scale, that will help you determine what circuit, your carbs are on, when your problems arise.
We know carbs have sereval circuits and some overlap each other. It's hard to ask for help or fix it, if you don't know when the problem occurs, or the throttle position.
This is a simple tool that you can make in about two minutes. It will help you to know what circuit, your carbs are on.
All you need:
1" piece of masking tape.
3" piece of masking tape.
A Sharpie or Pen.
I am posting some pics, because I'm not a good writer.
The first is what the whole thing should look like, when finished. Then I will try to go step by step.
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Last edit: 14 Sep 2009 22:09 by kzz1p.
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14 Sep 2009 21:45 #321722
by kzz1p
Replied by kzz1p on topic Jetting Helper
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14 Sep 2009 21:46 #321723
by kzz1p
Replied by kzz1p on topic Jetting Helper
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14 Sep 2009 21:47 #321724
by kzz1p
Replied by kzz1p on topic Jetting Helper
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14 Sep 2009 21:48 #321725
by kzz1p
Replied by kzz1p on topic Jetting Helper
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14 Sep 2009 21:56 - 14 Sep 2009 22:13 #321727
by kzz1p
Replied by kzz1p on topic Jetting Helper
Now you have an "Idle Mark" and "Wide Open".
Then I just Eyeball, the 1/2 throttle position.
Then I add the 1/4 throttle position.
Then the 3/4 throttle position.
Now when you are riding along, just look down at the throttle position.
Example: If you are at 3/4 throttle {That would be the carb needle, range} Just at the start of the main jet.
Next time you say something like - I was riding at 1/4 throttle when it started running bad. You can look up what circuit, that is.
I hope this may help others.
Then I just Eyeball, the 1/2 throttle position.
Then I add the 1/4 throttle position.
Then the 3/4 throttle position.
Now when you are riding along, just look down at the throttle position.
Example: If you are at 3/4 throttle {That would be the carb needle, range} Just at the start of the main jet.
Next time you say something like - I was riding at 1/4 throttle when it started running bad. You can look up what circuit, that is.
I hope this may help others.
Last edit: 14 Sep 2009 22:13 by kzz1p.
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- ArthurGoVroom
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- I'd rather ride it than shine it
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15 Sep 2009 05:38 #321747
by ArthurGoVroom
1976 KZ900A4, 4-1 header, rear lowering kit, grab bar removed, still shining and painting parts as time permits
Replied by ArthurGoVroom on topic Jetting Helper
I like it.
1976 KZ900A4, 4-1 header, rear lowering kit, grab bar removed, still shining and painting parts as time permits
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15 Sep 2009 07:15 - 15 Sep 2009 07:16 #321756
by Bluemeanie
1980 KZ650F1, Bought new out the door for $2,162.98!
Replied by Bluemeanie on topic Jetting Helper
Nice and simple, I like it! Now just ebay it for $9.99 and a roll of .99 masking tape can make you a couple hundred bucks!
1980 KZ650F1, Bought new out the door for $2,162.98!
Last edit: 15 Sep 2009 07:16 by Bluemeanie.
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15 Sep 2009 11:35 #321787
by loudhvx
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic Jetting Helper
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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15 Sep 2009 11:36 - 15 Sep 2009 11:47 #321788
by loudhvx
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic Jetting Helper
.
The thing is, all of the interesting stuff happens from idle to 1/4. After that, AFR only has mild changes based on the needle shape. You really need 1/16 throttle resolution to get much accuracy.
On the KZ550 TK carbs (manual slide), the needle clip greatly affects the 1/16 to 1/4 range. After that, the main jet starts to take over, or at least has as much influence as the nedle clip. That's with a single taper needle. With a double taper needle, the clip may affect up to 3/8.
The thing is, all of the interesting stuff happens from idle to 1/4. After that, AFR only has mild changes based on the needle shape. You really need 1/16 throttle resolution to get much accuracy.
On the KZ550 TK carbs (manual slide), the needle clip greatly affects the 1/16 to 1/4 range. After that, the main jet starts to take over, or at least has as much influence as the nedle clip. That's with a single taper needle. With a double taper needle, the clip may affect up to 3/8.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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Last edit: 15 Sep 2009 11:47 by loudhvx.
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15 Sep 2009 11:50 #321794
by loudhvx
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic Jetting Helper
Based on different jetting combos and using the wideband o2 sensor, I've been constructing this diagram. It's not done yet, but it's close.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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