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To adjust the pilot screw on a Suzuki Intruder VL1500, first ensure the engine is warm and running. Locate the pilot screw, which is typically found on the carburetor, and use a small screwdriver to turn it. Adjust the screw in small increments (about a quarter turn) while listening to the engine's idle; it should smooth out as you find the optimal setting. Always make adjustments gradually and note any changes, allowing the bike to stabilize between adjustments.
To set cam timing on a 1999 Suzuki VL1500 Intruder, first ensure the engine is at top dead center (TDC) on the compression stroke for cylinder one. Remove the timing cover and align the timing marks on the camshaft gears with the marks on the engine case. Adjust the camshaft position as necessary, ensuring the chain or belt is properly tensioned. Finally, reassemble the timing cover and double-check the alignment before starting the engine.
The air filter on my 2003 VL1500 is under the dash and 'false' tank. You have to take it all off and the air box literally sits under the speedo/dash.
I think you will find that the C50 forks have a smaller fork seal size, thus they would most likely be less stable even if they matched up fender and axle wise. I'm going by the 2003/2004 VL1500 which has dual front disc brakes. Maybe the older Intruders might match up.
3.9 to 4.5 with the filter
The Suzuki C90 (aka VL1500 or Boulevard C90) oil change [from manual]: Oil change only: 3.9 qt Oil & Filter change: 4.5 qt Completely dry: 5.3 qt
The Suzuki C90 (aka VL1500 or Boulevard C90) oil change [from manual]: Oil change only: 3.9 qt Oil & Filter change: 4.5 qt Completely dry: 5.3 qt