Most likely you are hearing piston slap. Probably time for a new top end.
stock gearing 60 mph
.5 L
the ktm 85sx. it beats all of the others
In 07, the KTM 85SX MSRP was $4,298.
with stock gearing 60mph
The CRF150R generally has more power compared to the KTM 85SX due to its larger engine displacement and design aimed at providing higher performance for older youth riders. The CRF150R features a 149cc four-stroke engine, while the 85SX has a 85cc two-stroke engine. However, the two-stroke engine of the 85SX delivers its power differently, often providing a more aggressive power band. Ultimately, the choice depends on rider preference and intended use.
32:1.
400cc 5wt fork oil
5.1 on my 2004 model
YES
About 5,000 new but around 2,000 if you find a pretty used one
The KTM 85SX typically requires around 0.7 liters (approximately 0.74 quarts) of 2-stroke engine oil for a complete oil change, including the oil in the transmission. It's essential to use a high-quality 2-stroke oil recommended by the manufacturer for optimal performance and longevity. Always check the owner's manual for the most accurate specifications and guidelines.