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Home / Engine Parts / Carburetors & Parts / Bing Rotax Parts /Carburetor Jetting Chart For Rotax Ul Engine

Carburetor Jetting Chart For Rotax Ul Engine

Use this chart to identify part number you need, then use bottom chart to select correct part number to order
Rotax® Engine Main Jet Idler Jet Needle Jet Jet Needle Clip Position Air Screw
277 (1) 148 45 2.72 8L2 2 1
277(2) 140 45 2.72 8L2 2 1
377 (1) 165 45 2.70 8O2 2 .5
377 (2) 155 45 2.70 8O2 2 .5
447 (1) 165 45 2.70 15K2 2 .5
447 (2) 155 45 2.70 15K2 2 .5
447DC (1) 135 50 2.70 6G1 3 1
447DC (3) 128 50 2.68 15K2 2 1
503SC (1)
Up to #3785371		 180 45 2.74 8G2 3 .5
503SC (2)
Up to #3785371		 158 45 2.74 6H2 3 .5
503SC (1)
From #3785372 Up		 185 45 2.72 15K2 3 .5
503SC (2)
From #3785372 Up		 165 45 2.70 15K2 3 .5
503DC (1) 158 45 2.74 8L2 1 .5
503DC (3) 148 45 2.68 11K2 2 1
532SC (1) 195 55 2.74 15K2 3 1
532SC (3) 170 55 2.74 15K2 3 1
532DC (1) 165 55 2.72 11G2 3 1
532DC (3) 145 55 2.68 15K2 3 1
582 (1) 165 55 2.72 11G2 3 1
582 (3) 145 55 2.68 15K2 3 1
1 = Without Rotax® intake silencer kit, with K&N RC1200 air filter, with or without Rotax® after muffler kit.
2 = With Rotax® intake silencer kit, with K&N CM0300 air filter, with or without Rotax® after muffler kit.
3 = With Rotax® dual intake silencer kit, with K&N RC1200 air filters, with or without Rotax® after muffler kit.
Main Jet
125 = Part No. R268-978
(05-01996)
128 = Part No. R261-085
130 = Part No. R268-979
135 = Part No. R268-980
138 = Part No. R268-998
140 = Part No. R268-981
145 = Part No. R268-982
148 = Part No. R268-995
150 = Part No. R268-983
155 = Part No. R268-984
158 = Part No. R268-996
160 = Part No. R268-985
162 = Part No. R268-990
165 = Part No. R268-986
170 = Part No. R268-987
175 = Part No. R268-988
180 = Part No. R268-989
185 = Part No. R261-080
190 = Part No. R261-084
195 = Part No. R268-992
200 = Part No. R261-082
205 = Part No. R261-087
220 = Part No. R261-081
Needle Jet
2.62 = Part No. R261-606 (05-01992)
2.68 = Part No. R963-691
2.70 = Part No. R963-698
2.72 = Part No. R963-697
2.74 = Part No. R963-699
2.76 = Part No. R963-693
2.78 = Part No. R963-696
2.80 = Part No. R963-695
2.82 = Part No. R963-694
2.94 = Part No. R961-022
Idler Jet
30 = Part No. R963-141
35 = Part No. R963-143
40 = Part No. R963-142 (05-02017)
45 = Part No. R963-144
50 = Part No. R963-140
55 = Part No. R963-147
60 = Part No. R963-145
65 = Part No. R963-146
Jet Needle
2H2 = Part No. R963-717 (05-02034)
4E2 = Part No. R963-716
6G1 = Part No. R261-642
6H2 = Part No. R963-719
8G2 = Part No. R963-712
8H1 = Part No. R261-643
8L2 = Part No. R963-714
8O2 = Part No. R963-711
1O = Part No. R961-045
11G2 = Prt No. R961-043
11K2 = Prt No. R961-044
15K2 = Prt No. R963-718
Jet Needle
Lower numbers indicate smaller jet size or opening. Low numbers = lean. High numbers = rich. First needle number denotes mixture above half-throttle. Needle letter denotes mixture below half-throttle.

Needle Clip
P/N R963-500