Posts
396
Joined
4/1/2008
Location
Coeur d'Alene, ID
US
2011 YZ 250
Brand new 295cc big bore. 2 hours on rebuild. Did a rejet in the morning before we rode. Started on the first kick afterwards.
Drove to the riding area. Started first kick. Was riding with my kids so I was stopping quite a bit to help them, etc. Probably started the bike 5-6 times, no issues.
Stopped at a little turn track to watch my youngest son for 15-20 minutes. Went back to the bike and gave it a kick. Nothing. Weird. Kick for 5 minutes or so, nothing. Replaced the plug. Nothing. Unhooked kill switch. Nothing.
Brought the bike home. Pulled the pipe and looked up the cylinder, all looks fine. Pulled flywheel to check woodruff key, all fine.
No coolant loss. No visible leaks and anything suspicious.
Tested all electrical components. All within spec except for Coil. Spec is .2-.3, tests .4.
I have spark, but it does not seem very good.
I did not check compression, but it takes a healthy boot to kick. It also ran absolutely great prior to me parking it the last time. I did a couple fast laps and it was amazing.
Put a little gas down the spark plug hole and kicked it over. Nothing except it backfired every 4-5 kicks.
The ignition cover gasket was screwed up in one hole, so under the cover had some grit in it. Not sure if this screwed up the stator.
Brand new 295cc big bore. 2 hours on rebuild. Did a rejet in the morning before we rode. Started on the first kick afterwards.
Drove to the riding area. Started first kick. Was riding with my kids so I was stopping quite a bit to help them, etc. Probably started the bike 5-6 times, no issues.
Stopped at a little turn track to watch my youngest son for 15-20 minutes. Went back to the bike and gave it a kick. Nothing. Weird. Kick for 5 minutes or so, nothing. Replaced the plug. Nothing. Unhooked kill switch. Nothing.
Brought the bike home. Pulled the pipe and looked up the cylinder, all looks fine. Pulled flywheel to check woodruff key, all fine.
No coolant loss. No visible leaks and anything suspicious.
Tested all electrical components. All within spec except for Coil. Spec is .2-.3, tests .4.
I have spark, but it does not seem very good.
I did not check compression, but it takes a healthy boot to kick. It also ran absolutely great prior to me parking it the last time. I did a couple fast laps and it was amazing.
Put a little gas down the spark plug hole and kicked it over. Nothing except it backfired every 4-5 kicks.
The ignition cover gasket was screwed up in one hole, so under the cover had some grit in it. Not sure if this screwed up the stator.
Weak spark? Do an ohms test of the coil as you should have a bright Blue spark at the plug.
Paw Paw
Jetting is really close, plug was light brown when I checked it.
Ohm test of coil was mentioned in the Original Post.
Have you cleaned the coil mounts and checked the plug wire?
Paw Paw
The Shop
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Free shipping: VITALMX
Post a reply to: YZ 250 will not start