Another easy jetting question

  • GregZ
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11 Dec 2009 06:15 #338482 by GregZ
Another easy jetting question was created by GregZ
Just finished complete top end on 73 Z1 motor. New guides ,seals complete valve job. Cyl. got minor hone new rings.
Stock 73 carbs 112.5 mains,20 pilots, 3 clip and Stock airbox.
Only change from stock is either a 4-1 yoshimura with baffle or a new Kerker.
Once everything is together I don't want to mess with anything
Should I richin the main jet one to 115? or 117.5?
thanks in advance

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  • Kawickrice
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11 Dec 2009 06:48 #338487 by Kawickrice
Replied by Kawickrice on topic Another easy jetting question
I could be wrong here but I am of the understanding that for each mod (pipe,pods, etc) go up 2 sizes for a ballpark starting point.
73 Kawasaki Z1
07 HD CVO Ultra Classic
82 Suzuki GS 1100
74 Yamaha RD 350 (My two stroke toy)
77 Kawasaki KZ 650B-1 (My putt around bike)
80 Indian Moped (My American Iron)
1
Long Gone
75 Suzuki GT550
74 GT 380
79 RD 400 Daytona Special
72 Honda CL 175
74 Honda QA 50
Tampa FL

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  • TeK9iNe
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11 Dec 2009 07:33 #338502 by TeK9iNe
Replied by TeK9iNe on topic Another easy jetting question
1 size up should be ok, but 2 might be required depending on some conditions. You will have to swap them and see...

You will have to add some more fuel to the pilot circuit however (via air/fuel screws), to prevent popping on decel.

Cheers.

B)
Motorcycle Shop Owner/Operator

79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors ;)

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  • GregZ
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11 Dec 2009 17:35 #338571 by GregZ
Replied by GregZ on topic Another easy jetting question
two it is. 117.5's maybe lean out later if required
cheers
gregz

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11 Dec 2009 17:44 #338573 by davel
Replied by davel on topic Another easy jetting question
GregZ wrote:

Once everything is together I don't want to mess with anything

Famous last words. If I had a nickle for every time I told myself that...

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  • GregZ
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12 Dec 2009 05:05 #338593 by GregZ
Replied by GregZ on topic Another easy jetting question
I agree wishful thinking

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