Lack of Oil
Overheating
SAE10w30 Synthetic
Its just black with decals.
yes the only difference is the ignitions
One can purchase a Yamaha XS650 motorcycle direct from Yamaha dealerships. Local dealers tend to be located on the outskirts of towns and advertise in the car pages of local newspapers. Alternatively, one could look on eBay Motors or Bike Sales websites.
No , It would be nearly impossible.
650 has 63mm bore and the 400 has 69mm ... don't think it would fit
The xs650 is a motorcycle made by Yamaha. It started production in 1968 and ended production in 1985. It has a 500 cc twin version as well as a 650 cc twin version.
Here's a good resource on changing the oil and cleaning the oil filter on an xs650 http://www.xs650.com/forum/showthread.php?t=15
The recommended about is 2500cc Source: http://www.xs650.com/forum/
From the user manual, 0.7-0.8 mm
the gap is 0.8 mill or 0.9 for hotter plugs best of luck
six plus the prefix such as 3L1.. ie. 3L1 - 011003