Crf450 starting difficult

tyler_richard
Edited Date/Time 4/30/2016 10:26am
Hi guys, my 2009 crf450r recently started giving me issues on cold starts, it takes about 6 kicks to start it with the "choke" on, and occasionally on a cold start makes what sounds like a mini backfire. After its warmed up, starts first kick. I believe this to be an intake valve starting to suck into my head. Any other suggestions? Thanks helps a lot
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Paw Paw 271
Profile picture for user Paw Paw 271
Posts
3640
Joined
4/3/2013
Location
Benton, LA US
Paw Paw 271 4/30/2016 10:00am
4/30/2016 10:00am
Check the valve clearances and the cam timing.
Has the cam chain ever been replaced?
Have the valves ever been re-shimmed?
Has the bike set for some time without running?
Carb clean and fresh fuel?

Paw Paw
mxb2
Profile picture for user mxb2
Posts
22485
Joined
6/15/2010
Location
Bowie, MD US
mxb2 4/30/2016 10:19am
4/30/2016 10:19am
Paw Paw 271 wrote:
Check the valve clearances and the cam timing. Has the cam chain ever been replaced? Have the valves ever been re-shimmed? Has the bike set for...
Check the valve clearances and the cam timing.
Has the cam chain ever been replaced?
Have the valves ever been re-shimmed?
Has the bike set for some time without running?
Carb clean and fresh fuel?

Paw Paw
The bike is efi.
tyler_richard 4/30/2016 10:26am
4/30/2016 10:26am
Just bought the bike a couple months ago, I was planning on checking the valves. It has fresh 91 octane with Lucas oil octane boost in it. And no I ride regularly so it hasn't had much down time. thanks

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