Depends on where you ride, the numbers mean thickness and it depends on temp. Lower the first number the easyer it starts in cold temp and higher the second number the better it can stand high temps. A good 0W-40 or if you dont live in a cold place 10-50 should do a little better. I run Amsoil 0W-40.
When owning and maintaining a recreational vehicle, it is important to know what type oil is needed to run it smoothly. For a 2003 Yamaha Raptor 80 SAE 10w40 type se motor oil is recommended.
I have the same problem with mine. 2003 raptor 80 with 40hrs on it!!
The engine number on a 2003 Yamaha 660 Raptor is located on the engine casing. It is found on the top and on the lower left hand side.
34 mm
Depending on the shape around $2,000.00
the 660 will hold a lil over 3.75 quarts or tight around there
optima red top very good battery for starting but pricey
should be your starter selonoid...they are a common problem on raptors.
Alittle over 2.6 qts get 3 qts and you should be fine! Add, let engine run, check, adjust, repeat.
The Yamaha owners manual states that the clutch is lubricated with the engine oil, there is no mention made of transmission oil capacity or type. Transmission shares oil with engine. You can register on Yamaha.com to access an online owners manual. Owner 2003 660 Raptor.
660
2003 YAMAHA WR450F