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answered on dootalk. 75W90 synthetic gear lube
10w 40...yamalube is the best suggestion
Yamalube 2 stroke gear oil 10w - 40 wt available at your dealer or online
Yamaha
Any gear lube designed for a 2 stroke/wet clutch gear box!!! I use Torco MTF 80 wt. which meets Yamahas 10/30 trans specification!!! Been using it for 10 years on many Banshees with no problem!!!!
SAE 10w30 Synthetic oil.
Yamaha Blasters take unleaded gas only.
If coolant needs to be added and the owner does not know what kind is already in the engine, it should be drained and flushed before adding any new. Most coolants are appropriate, but it is not recommended to mix brands or types. Use a coolant safe for aluminum blocks or buy Yamaha brand coolant specifically for your model. The coolant should be premixed 50/50 or if it is not premixed, mix it 60% coolant and 40% water before adding.
it depends on what u want is it speed or what? a 250 isnt super fast and will top out at about 60-70kph i would go for a raptor but dont get into mud u wont get out its not 4x4 is chain driven if u want 4x4 get a 450 kodiak or 350 kodiak about the same speed but with 4x4
15w/30 but that is hard to find so I use15w/40
4cycle
Chase Rocks