souring VM24 #16 pilot jets?
- DoctoRot
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souring VM24 #16 pilot jets?
23 Apr 2022 12:08 - 24 Apr 2022 09:49
I recently swapped carbs on a kz650 from the VM22 to VM24. big improvement in fueling but it was getting this weird surging cruising at highway speeds and also during off-idle acceleration. I changed the pilot from #15 to #17.5 and the surging went away and overall performance was improved except now it is too rich at idle and can be difficult to start compared to the #15 pilot. I was consulting the service manual and I saw that the original pilot jet size is listed as #16. which seems like it would be the perfect balance, however i cannot find this size of jet anywhere.
any ideas?
any ideas?
Last edit: 24 Apr 2022 09:49 by DoctoRot.
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- Warren3200gt
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Re: souring VM24 #16 pilot jets?
23 Apr 2022 12:26 - 23 Apr 2022 12:30
I think that those and 100 mains were for US emissions on 22's. In the uk the standard jets in 24's is 15's an 102.5's.
Bets are off if you have non stock exhaust and air supply.
Also as you have founds mikuni jets go up in 2.5's so 16 is a misprint or a special. Never seen any and I have striped plenty of US import 22's.
Bets are off if you have non stock exhaust and air supply.
Also as you have founds mikuni jets go up in 2.5's so 16 is a misprint or a special. Never seen any and I have striped plenty of US import 22's.
Z1000J2 somewhat modified!
Last edit: 23 Apr 2022 12:30 by Warren3200gt.
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- gd4now
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Re: souring VM24 #16 pilot jets?
23 Apr 2022 13:38
I have always thought that table in the B1 manual is a misprint, but I have no data to back it up other than other lists in later manuals, and the fact I have never seen a 16 pilot jet offered by Mikuni,
1977 KZ650 B1
Pods and Denco header
OLD KAW OWNERS SMILE ALOT
Pods and Denco header
OLD KAW OWNERS SMILE ALOT
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- 750 R1
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Re: souring VM24 #16 pilot jets?
23 Apr 2022 14:55 - 23 Apr 2022 14:56Hi Doc, I haven't read the other comments yet but, I had this exact same thing with my sons bike, fully rebuilt VM24's, 100% spotless, the bike "hunted" at highway speeds, A hesitation/ surge , I raised the needle one position and the problem went away immediately, haven't touched the carbs since....I recently swapped carbs on a kz650 from the VM22 to VM24. big improvement in fueling but it was getting this weird surging cruising at highway speeds and also during off-idle acceleration. I changed the pilot from #15 to #17.5 and the surging went away and overall performance was improved except now it is too rich at idle and can be difficult to start compared to the #15 pilot. I was consulting the service manual and I saw that the original pilot jet size is listed as #16. which seems like it would be the perfect balance, however i cannot find this size of jet anywhere.
any ideas?
Last edit: 23 Apr 2022 14:56 by 750 R1.
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- DoctoRot
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