Welcome Ralph.
Here are the things I always checked when my 97 620 started hard.
Valve clearance, this one is MAJOR.
Jetting (what color is the head pipe, if blue then you are too lean).
Air cleaner (is it clean or solid crud?)
Is there an inline fuel filter between the carb and the fuel tank (replace it)?
Those LC4 bikes are very easy to start if your valves are in spec.
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2011 Husaberg TE 300
2002 640 LC4e 
Past Rides
'03 KTM 450 EXC (SOLD)
'01 Honda XR650R (SOLD)
'98 Honda XR600R (SOLD)
'95 KTM 620 RXC (SOLD)
'88 Yamaha TT600 (SOLD)
'86 Yamaha XT 350 (SOLD)
'84 Yamaha IT465 (STOLEN)
'83 Kawasaki KDX 450 (SOLD)
'83 Honda CB1000 Custom (SOLD)
'82 Kawasaki KDX 400 (SOLD)
'77 Yamaha DT200 (SOLD)
'70 Honda CT70 (SOLD)
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540SXC - Pig to start!!!
Linear Mode
