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Before I pulled out the motor for a rebuilt, bike was starting fine, except in hot temp, it will crank 4 to 6 times before it starts. cold start is great. motor sounds like dying after warmed up, but it went to normal after 10 minutes of ride. Sometimes plenty of white smoke when cold start, after it warmed, the smoke goes away. Idle was fine but it once went up to 1500 for one hour and the next it drop back to 1000. So i decided to rebuilt the motor to rid this problem. Now that motor is back, it can't fire up, exactly as the video in the 1st page of this thread. Been reading up for hours on this thread, these are the following that I did hopefully to resolve this startup issue. I did the following

new crankshaft sensor,
throttle body cleaned,
new fuel pump,
new plugs,

still it won't start, just kept cranking unless throttle is applied. but it will dies when throttle is released.

next did today

cleaned Isc valve and hoses
cleaned Vacuum hoses (saw a good amount of black dirt came off)
rechecked Valve clearance, saw that 6 exhaust valves are at min tolerances, will be waiting for my shims to adjust them to the highest tolerances.

hopefully it will startup and runs well.
 

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an update. my bike fires quick and idles well. warm start was quick with 2 cranks. This thread helped me and gave me a direction to look for in solving my frustrating startup issue. I did the following:

adjusted my exhaust valves clearance to the highest tolerances
changed CKP sensor
Cleaned ISC valve and hoses
Cleaned Vacuum hoses

thank you guys, you guys are awesome.
 

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Hey guys - just wanted to let you all know that this fix - has apparently worked for me - I took the bike apart - replaced the T's and vacuum lines and performed a cold start ( im in canada, and doing this work before winter storage) at 1 degree, and she started right up - no hesistation. Thanks to all that have added there two cents and worked so hard to finally get this resolved will the dealership couldn't.
 
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