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KZ650 jetting question
- shanecrow99
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29 Aug 2008 06:48 - 29 Aug 2008 06:57 #234582
by shanecrow99
KZ650 jetting question was created by shanecrow99
I am running a few mods and need to know what the ballpark jetting would be. I am running a Kerker 4-into-1 header with a non-baffled Kerker muffler. I also have a K&N drop-in filter.
My calculations put me at about 110 on the mains (4th position on the needle)and 17.5 on the pilot jet.
Does that sound about right?
My calculations put me at about 110 on the mains (4th position on the needle)and 17.5 on the pilot jet.
Does that sound about right?
Last edit: 29 Aug 2008 06:57 by shanecrow99.
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- wiredgeorge
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29 Aug 2008 07:21 #234587
by wiredgeorge
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
Replied by wiredgeorge on topic KZ650 jetting question
The main jet might be a shade large with this set up but otherwise, OK.
wiredgeorge Motorcycle Carburetors
Mico TX
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- shanecrow99
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29 Aug 2008 07:30 - 29 Aug 2008 07:31 #234592
by shanecrow99
Replied by shanecrow99 on topic KZ650 jetting question
George, your thinking 107.5 mains?
Truth be told, I have no idea what I am currently running but I will be cleaning my carbs soon and wanted to know what to expect when I get pull the carb jets. I have some sort of weird "miss" between 50 - 60 mph. My timing is dead on and I replaced the coils with Dyna 3 ohms, plugs and wires are new and the ignition system was swapped over to a Dyna-S. So, basically, I don't think that my ignition is the cause for the miss I am hearing. Therefore, I will be tearing the carbs down soon.
Truth be told, I have no idea what I am currently running but I will be cleaning my carbs soon and wanted to know what to expect when I get pull the carb jets. I have some sort of weird "miss" between 50 - 60 mph. My timing is dead on and I replaced the coils with Dyna 3 ohms, plugs and wires are new and the ignition system was swapped over to a Dyna-S. So, basically, I don't think that my ignition is the cause for the miss I am hearing. Therefore, I will be tearing the carbs down soon.
Last edit: 29 Aug 2008 07:31 by shanecrow99.
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- wiredgeorge
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29 Aug 2008 08:07 #234602
by wiredgeorge
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
Replied by wiredgeorge on topic KZ650 jetting question
The size of the mains isn't all that critical. #107.5 is pretty good. One size one way or the other won't matter. Once you get the bike together and running OK, take it to redline. If you can pull redline, the main jets are OK.
wiredgeorge Motorcycle Carburetors
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- shanecrow99
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29 Aug 2008 12:55 #234637
by shanecrow99
Replied by shanecrow99 on topic KZ650 jetting question
Thanks a bunch WG. You've been most helpful.
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- Bluemeanie
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30 Aug 2008 20:28 #234748
by Bluemeanie
1980 KZ650F1, Bought new out the door for $2,162.98!
Replied by Bluemeanie on topic KZ650 jetting question
I have the same exact setup on my 650 (Kerker, Dyna S, K&N drop in, coils) but my Kerker IS baffled and I run 105 mains and bike pulls hard to redline so 107.5's sounds good for you.
1980 KZ650F1, Bought new out the door for $2,162.98!
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- spudbudy
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11 Sep 2008 16:34 #236746
by spudbudy
78 KZ 650B2. Vetter faring, Dyna S, Dyna Green coils, WG coil mod,AGM Battery, VM26SS carbs, Pilot jet 15, mains 110, jet clip #2 shimmed position, Modified stock air box, stock air filter, Kerker 4 into 1 with stock baffle. currently 48,785 miles. and climbing daily.
Replied by spudbudy on topic KZ650 jetting question
I have tried that setup and ended up with a very similar problem sounding like the ignition is cutting out at about 4700 to 5700 rpm.baffle in mine at any rate went down on the main jet and it cured the problem. also used stock airbox with stock filter.
78 KZ 650B2. Vetter faring, Dyna S, Dyna Green coils, WG coil mod,AGM Battery, VM26SS carbs, Pilot jet 15, mains 110, jet clip #2 shimmed position, Modified stock air box, stock air filter, Kerker 4 into 1 with stock baffle. currently 48,785 miles. and climbing daily.
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