2009 can am 450 EFI - Can-Am ATV Forum
 
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post #1 of 6 Old 04-19-2019, 09:47 PM Thread Starter
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2009 can am 450 EFI

Hello:


I just purchased a 09 450 efi and was told it wouldn't start.


So replaced the cam chain tensioner, the chain was real loose and it also had a blown head gasket which i replaced as well, checked all the valve clearances, all good.


now it still wont start, it will occasionally backfire out the exhaust while trying to start it, the exhaust pipe gets warm while trying to start it as well.


Also the spark plugs have oil residue on them when i pull them out after trying to start it. check for spark and spark is bright blue.



Any ideas??


Thanks
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post #2 of 6 Old 04-19-2019, 09:56 PM
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Are you 1000% certain you got the mechanical timing right? Backfiring is usually a sign of timing being off.

Oil on the plugs could be valve seals leaking, did you replace them while working the valves/head?

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post #3 of 6 Old 04-19-2019, 10:06 PM Thread Starter
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Yes, lock it to TDC and aligned the marks where they are suppose to be on the cam gears.


i did not replace any valve seals as when i found the blown head gasket, i thought i had the problem solved.


but i can look at them and see, this bike is a pain to get that gas tank out though, fought with it for 30 mins.
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post #4 of 6 Old 04-19-2019, 10:28 PM
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Well, I mean, the valve seals are kinda secondary to getting it running again, if they're even an issue. Kinda need it running to see if it smokes at start-up, to help diagnose those.

So if you've got timing/compression, and spark, only thing missing is fuel. EFI means no pesky carb issues, so check for fuel delivery- can you check fuel pump operation/psi?

Speaking of psi- have you confirmed a good strong compression number? Did you take the piston out of the jug? Or just work on the timing chain/head? I'd hate for that thing to have some piston/ring/jug problems, and you were tricked into thinking the timing was "all" that was wrong.

"Barn find" 05 Bombardier 400 MAX XT - stock
Upgrades:
12" Beadlocks and 28" S/W Outlaws
WildBoar Radiator Relocate
D2 Fender Flares
OPT7 C1 Lightbars 14" and 22"
SYATV Snorkels

Previous bikes:
07 Brute 785
07 Renegade 800
08 Outlander 800 Gorilla edition
08 Outlander 800 Max XT Gorilla lifted
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post #5 of 6 Old 04-19-2019, 10:39 PM Thread Starter
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yes the fuel delivery seems all good, took injector out and turned it over and it works, its getting everything it needs, so i am thinking you are correct about me getting fooled into thinking it was a timing issue, but that went out the door as soon as i found the leaky head gasket, so i am leaning towards the rings being done, have not done a compression test yet but it seemed to have good compression when manual turning it over. with a leaky valve is should still start at least, even with bad rings it should start as well???? the cylinder walls look flawless, no scores or anything, which is why i didn't go any further.



when i try to crank it over, if i push the throttle open is struggles to to turn over???
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post #6 of 6 Old 04-20-2019, 05:36 AM
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Pushing the throttle may it not start.

On an outlander, if you push throttle while cranking, it will not start.

1998 Honda 300
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2012 Can Am 1000XT, 15800 kms
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