This is an older c90 model but changing spark plugs should be the same as this model hasn't changed much and almost remained the same http://www.mambaville.com/ForumFAQ/LCService/Manual/manual-index.htm I hope this answered your question
SOURCE: How much of the Suzuki C90 Boulevard do I have to
Take the tank sides off and then the chrome covers over the spark plugs. The genuine spark plug tool that came with your bike works well to remove the plugs.
There is no need to remove the seat, instrument cluster or airbox.
SOURCE: How do I change spark plug of 2005 suzuki s40?
Remove the seat (three bolts). Drain and then remove the gas tank (two bolts in the front, pull backwards and to the left as you simultaneously pull up), and disconnect the gauge harness and speedo cable. Obviously you need to disconnect the fuel line from the tank too.
Now remove the left head cover and you'll have access to the plug.
SOURCE: how many quarts of oil in suzuki C90
My 2007 C90t which is the same motor as yours requires 4 1/2 quarts of 10/40wt.
Stick with Suzuki brand oil btw. When I changed to Amsoil, I developed a problem.
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