First a couple questions....do you have the stock clutch lever on your bike, or have you replaced it with an aftermarket one?
Have you inspected the clutch lever bushing, pushrod, and rubber boot in the lever assembly?
If your bushing is worn badly, or worn through, the clutch lever throw won't be long enough to activate the switch to allow the bike to start.
Below are the parts for the Lever assembly.
If the bushing is worn badly, also check the bronze bushing in the lever itself, if its egg shaped you'll need a new lever as well, which is why I've included those part numbers as well.
BUSH
22885-MB0-006
Retail Price: $12.44
Your Price: $9.23
ROD, PUSH
22884-MB0-006
Retail Price: $19.85
Your Price: $14.74
BOOT
45504-410-003
Retail Price: $11.69
Your Price: $8.68
LEVER, L. HANDLE (COO)
53178-MCS-305
Retail Price: $25.11
Your Price: $18.64
If the lever assembly is in good working order, the next thing you should check is the clutch lever switch, which is held in place with a single screw under the lever.
When you pull the lever you should hear a CLICK when the lever activates the switch.
No Click, switch is probably bad (common)
The side stand switches very seldom go bad, but I've included the part number just in case you need it.
These were just taken off RonAyers.com, but can be ordered through your dealership, or any of the online sources.
SWITCH ASSY., CLUTCH
35330-MB0-003
Retail Price: $17.53
Your Price: $13.01
SWITCH SET, SIDE STAND
35070-MCS-G00
Retail Price: $54.93
Your Price: $40.78
www.ronayers.com
Let us know what you find.
