When installing accessory engine equipment, manufacturers often enclose guidelines on rejetting the carburetor.

4. The motorcycle is in use at considerably higher or lower altitudes or in a considerably hotter or colder climate than in the past.

5. The motorcycle is being operated at considerably higher speeds than before and changing to colder spark plugs does not solve the problem.

6. Someone has previously changed the carburetor jetting.

7. The motorcycle has never held a satisfactory engine tune.

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