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yamaha17rider

Yamaha no spark

7 posts in this topic

I'm ridding a 2007 yz450f i think is bone stock except for the plastics and the air filter

 

So a little back story i crashed a few times on a hill clime, and the rocks put a miner crack in the staider cover. i jb welded it and my dad put it back together. we when to the dunes the next week or so and when we got there on are first ride bout 10 mins in my cam gasket blows out. so we tow it back making sure not to get any dust or dirt in the engine. when we get it back we cant find the problem so we lossen the cam cover and put the gasket back in. i ride it around a little bit more and the same thing happens again so we get it back and decide to check the oil and there was non in it so we put oil in it ans the gasket back in and when i take it for a test ride every things fine. so the next day we get way out in the middle of the dunes and my bike dies luckly right at the top of a dune. no spark what so ever. so we end up loading it on the front of a sand rail and get it back to camp. We took the coil from a yfz450 and it dosent do anything. when we get home we tare in to it. and find the staider has gone bad. we replaced it and no spark. we replace the coil, sparck pluge and cdi and still no park so we test the staider and its way out of speck so we send it back and get another one that's barley out of speck. i threw it in and still nothing. i cant figure it out and im dieing from not being able to ride!! my dad just orderd a used staider from ebay so were going to see if that helps but if u have any ideas just shoot. please 

 

thanks 

 

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I'm ridding a 2007 yz450f i think is bone stock except for the plastics and the air filter

 

So a little back story i crashed a few times on a hill clime, and the rocks put a miner crack in the staider cover. i jb welded it and my dad put it back together. we when to the dunes the next week or so and when we got there on are first ride bout 10 mins in my cam gasket blows out. so we tow it back making sure not to get any dust or dirt in the engine. when we get it back we cant find the problem so we lossen the cam cover and put the gasket back in. i ride it around a little bit more and the same thing happens again so we get it back and decide to check the oil and there was non in it so we put oil in it ans the gasket back in and when i take it for a test ride every things fine. so the next day we get way out in the middle of the dunes and my bike dies luckly right at the top of a dune. no spark what so ever. so we end up loading it on the front of a sand rail and get it back to camp. We took the coil from a yfz450 and it dosent do anything. when we get home we tare in to it. and find the staider has gone bad. we replaced it and no spark. we replace the coil, sparck pluge and cdi and still no park so we test the staider and its way out of speck so we send it back and get another one that's barley out of speck. i threw it in and still nothing. i cant figure it out and im dieing from not being able to ride!! my dad just orderd a used staider from ebay so were going to see if that helps but if u have any ideas just shoot. please 

 

thanks 

As dumb as this sounds, did you try disconnecting the kill switch?  Here's a thread that you might be interested in and might find useful:

 

http://www.thumpertalk.com/topic/985154-2010-2012-yz450f-loss-of-low-to-mid-range-power-timing/

 

:devil:

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yz490-devel thanks for the thread

 as for the kill switch we omed it out and it was fine we also disconected it to no prevail

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To get rid of the easy part first, your cam gasket blew out because your breather tube is blocked of someplace.  That's the black, 1/2" hose coming out of the top of the cam cover. 

 

Sounds like you're chasing your tail on the electrical stuff.  Start with the stator, then check each component according to the manual, then check the continuity of the wring harness as well.  You're missing something somewhere, or it has spark now and it's not starting for some other reason.

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Thanks every one for the help. We fix the problem with a stock staider. however i can figure out why the cam gasket blew.  Grayracer we checked the brether tube because thats what we thought it was but it had nothing blocking it.

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Well, I did see a 426 spit the cam cover gasket out once when accumulated fuel in the crankcase ignited.  Seems the gentleman who owned it had a habit of leaving his gas "on".

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