Jet Needle Groove Position Adjustment; Standard Clip Position - Yamaha YZ125(V) Owner's Service Manual

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Jet needle groove position adjustment

Should the engine be hard to run smoothly at

intermediate speeds, the jet needle 1 must be

adjusted. If the mixture is too rich or too lean at

intermediate speed operation, irregular engine

operation and poor acceleration will result.

Whether or not the richness of the mixture is

proper is hard to be determined by means of the

spark plug and therefore, it should be judged

from your feeling of actual engine operation.

1. Too rich at intermediate speeds

Rough engine operation is felt and the

engine will not pick up speed smoothly. In

this case, step up the jet needle clip by one

groove or 0.5 groove and move down the

needle to lean out the mixture.

2. Too lean at intermediate speeds

The engine breathes hard and will not pick

up speed quickly. In this case, step down the

jet needle clip by one groove or 0.5 groove

and move up the needle to enrich the mix-

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