08 YZ450 can't kick start (new bike to me)

13 replies to this topic
  • cbr900oc

Posted February 28, 2014 - 09:57 PM


Well I picked up a 2008 YZ450 the other day for super cheap. Guy that had it said it will push start and run perfect, but wasn't able to kick it over. Looked up what issues this might be and found the automatic compression release could be the culprit. I'm just wanting to know if this is a common problem with these bikes, and if an aftermarket cam chain tensioner would help it to not happen as frequently. Got the bike for a pretty good deal as clean as it is too....... any help is greatly appreciated.

  • ratom98

Posted March 01, 2014 - 12:04 AM


i would check you valve clearances and don't ride it until you do. when they are out spec the bike usually becomes hard to start

  • cbr900oc

Posted March 01, 2014 - 02:13 AM


That's what I've kind of read around is my exh cam is a tooth off or more on timing.

Edited by cbr900oc, March 01, 2014 - 02:14 AM.

  • grayracer513

Posted March 02, 2014 - 12:22 PM


Valve clearances, timing, and pilot jet/fuel screw adjustments first.

  • WR450F_No28

Posted March 02, 2014 - 03:20 PM


see grayracer513...it is actually a lot easier than you think.  the stock Yamaha manuals are actually excellent, so if you don't have one, get one :)

  • cbr900oc

Posted March 02, 2014 - 05:17 PM


Thanks guys! I'll have to get a manual and go from there. Been reading quite a few forums on here. Sounds like it is a pretty good year for the YZ

  • DC_Excitement

Posted March 02, 2014 - 05:21 PM


free manual here ------> http://www.yamahaown...ook.com.au/?r=0

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • cbr900oc

Posted March 02, 2014 - 09:24 PM


I greatly appreciate all the help guys!! new to the forum and to Yamaha.

  • Motomike1127

Posted April 04, 2014 - 04:54 AM


My 07 yz450 is doing the same thing my bike started first kick for the past we'll but now it won't kick over put it will pop start and run fine and it is a lot harder to kick anyone no what may be wrong

  • grayracer513

Posted April 04, 2014 - 06:41 AM


... it is a lot harder to kick


Cam timing.  Probably a stiff chain.

  • Motomike1127

Posted April 04, 2014 - 10:10 AM


What can I do to fix that I was thinking make sure the time is lined up and check the tensioner

  • cbr900oc

Posted April 04, 2014 - 11:50 AM


Yep. I pulled my valve cover checked that i was tdc. And my cams were off for sure!! Pulled cams changed chain and re installed everything. Started right up

  • Motomike1127

Posted April 04, 2014 - 05:06 PM


I just did the same thing mine was off put it back together started 1st kick cold with no joke

  • cbr900oc

Posted April 04, 2014 - 05:07 PM


What a relief that was huh!? My honda NEVER did that!! So I was stumped!

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