HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
LeeRidesYamaha

Little wipeout on my new to me 07 YZ450f and bike will no longer start

7 posts in this topic

Just bought the bike, took it up my dead end road with a grass shoulder. The bike like killed upshifting into third/fourth, and my rear end locked up and slid out fron underneath me. Knee is scraped, and my forearm is cut up, but the bike will not start. It turns over, but just will not start. I'm hoping it is just a flooded carburetor, but what else could it be? I stopped trying to start it maybe ten minutes after the incident so I could shower and tend to my wounds. Then I came back out a half hour later and tried starting it. Nothing. Kicks over and all that, but sounds almost like its out of fuel. Like it isn't even trying to start. And when I try roll starting it, it kind of sounds sputtery and will not start. I need help.

Share this post


Link to post
Share on other sites

Start with a new plug, But, the fact that it died like it did makes me think that it jumped valve timing. 

Share this post


Link to post
Share on other sites

"A little wipe-out and it won't start" is quite a little bit different than, "the engine locked up in third gear", don't you think?

 

If it was me, I'd pull the cam cover and take a look at the timing for starters.  Valve clearances, too.  If you find a bunch of them way too loose, it means the valves hit the piston and they're bent.

 

Does the bike turn over and feel like it has normal compression?

Share this post


Link to post
Share on other sites

Start with a new plug, But, the fact that it died like it did makes me think that it jumped valve timing.

Yeah. Thats what one guy had said. But if it jumped valve timing before it quit, the piston could have smacked a valve and there's some big repairs there... Do you think I'm unlucky enough to have that happen, or will it just need to be timed?

Edited by LeeRidesYamaha

Share this post


Link to post
Share on other sites

"A little wipe-out and it won't start" is quite a little bit different than, "the engine locked up in third gear", don't you think?

 

If it was me, I'd pull the cam cover and take a look at the timing for starters.  Valve clearances, too.  If you find a bunch of them way too loose, it means the valves hit the piston and they're bent.

 

Does the bike turn over and feel like it has normal compression?

Yes.. Ive been trying to psych myself out of that scenario, and was waiting until it could get torn apart. The bike does kick over and sounds and feels like it has normal compression.

Share this post


Link to post
Share on other sites

If it did jump time I would replace the chain at the very least and take a good look at the tensioner. there is a chance the valves are okay.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0