Suzuki boulevard c90where is the location of the orange and blue accessory wire in the headlamp of a 2006 suzuki boulevard c90?

SOURCE: backfiring

when you replaced the exaust you should of had the jetting changed they have to be rejetted.
there is your problem

SOURCE: i'm looking for battery motorcycle suzuki

the factory size battery for a C90 is YTX16-BS-1
you might also try UTX16-1.
I just bought a replacement for my 05. Got it on
ebay. shipped to me for around $80.00 including
acid.

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.

SOURCE: where is the air filter on a 2007 c90 1500 suzuki boulevard?

The gas tank is under the seat. To get to the air filter, you have to remove the speedometer chrome cover and the upper side covers.
I can do mine in about 10 minutes. I also have a '07 with 17000 miles on it now.

SOURCE: battery location in the bike

It's in a box on the front of the bike located under the oil cooler (looks like a mini radiator and has two hoses going to it). If you look right under that cooler you should see a metal plate with ribs on it (either 3 or 4 ribs) that's the front plate. Just above that is a plastic lid to the battery box.

The battery cables are routed behind the box. Once you get the lid off (two screws one on either side) you should see the indents for the cables in the lid. The battery terminals face the rear of the bike.

Hope this helps.