I use Mobil 1 15-40 wt synthetic in my 1995 Yamaha TW200. It has over 6,500 miles with no problems.
about 70mph
about 13 horsepower at the wheel
Try this http://tw200forum.com/index.php?/topic/361-adjusting-the-valve-clearance/
There's one drain plug and cover on the side of the motor that has (or should have) a screen inside. Drain the oil, clean the screen. Be sure to change the oil filter. Be sure to change the oil before putting the bike away for the winter or for long term storage as the chemicals created in the oil for use become corrosive. See also http://www.dansmc.com/change_oil.htm
got a new grizzly 700 yamaha but not sure wat oil to use, what kinda oil does it use
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Yamalube from a Yamaha dealer
Yes, the easiest path is to use a 225 conversion kit, part number 3RW-W0795-00, and get an early TW200 kick start lever (the kit unit will not fit). See the many threads at tw200forum.com for more info on this. Costs are reported anywhere from $150 to $450 depending on where the parts are bought and who does the labor.
4cycle
the manufacture specified oil weight is 20/40. i use only Yamaha oil as it is designed for Yamaha products.
Cooking oil. Like Crisco.