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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