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Discussion Starter · #1 ·
For the last 800-1000 times that I've started my SV, she has come to life basically on the first turn. This morning, I heard it hit once and die. Now the motor spins but won't start:

Compression: It sounds like I have compression based off the way the starter spins the motor
Air: Worked beautifully yesterday, I don't see why it wouldn't be getting air.
Fire: Didn't have time to check this morning, but I'm thinking this is the problem
Fuel: Nearly full tank and was running beautifully yesterday.

I ride nearly every day, so it seems like I have an electrical issue. Can you guys give me some things to check when I get home?

Thanks,
Nick
 

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Have you checked your valves? You could have jumped timing. My suggestion is to manually turn the crank a few times before you try anything else with the starter. Make sure you don't have any interference. I just went through this with my second gen. I had a broken intake valve and two dropped exhaust valves.

I know there are a million other things it could be but my suggestion is good insurance for your engine unless it is already too late.
 

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Cool, I don't even know where the fuses are, maybe I can go check those really quickly during lunch... Thanks.
Also, just try holding the throttle all the way open when you crank it. (I think this is even mentioned in the service manual)

I'm not sure whether the ignition fuse can blow without disabling the ECM too- which you probably would have noticed because I think the gauge would have done something funny.
 

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Discussion Starter · #8 ·
Have you checked your valves? You could have jumped timing. My suggestion is to manually turn the crank a few times before you try anything else with the starter. Make sure you don't have any interference. I just went through this with my second gen. I had a broken intake valve and two dropped exhaust valves.

I know there are a million other things it could be but my suggestion is good insurance for your engine unless it is already too late.
No, I haven't. I sure hope that's not it, but I have experience with a broken valve spring on my WR450 :eek:


Also, just try holding the throttle all the way open when you crank it. (I think this is even mentioned in the service manual)

I'm not sure whether the ignition fuse can blow without disabling the ECM too- which you probably would have noticed because I think the gauge would have done something funny.
The gauges are lit up just like normal. Think I'll check the fuses first, then manually turn the crank to see if I can feel anything funny. Then I plan on taking a plug out to see if I can make fire. Sound good?
 

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No, I haven't. I sure hope that's not it, but I have experience with a broken valve spring on my WR450 :eek:




The gauges are lit up just like normal. Think I'll check the fuses first, then manually turn the crank to see if I can feel anything funny. Then I plan on taking a plug out to see if I can make fire. Sound good?
You have to remove the spark plugs and then use a ratchet to turn the crank; the nut is behind the large hex "plug" on the right side. Always turn in the direction of the arrow. Personally, I'd try the open-throttle thing first (even before fuses, though fuse is the likely answer) but it's up to you. The way I look at it, If the timing already jumped enough to cause interference, the damage is done by the first time the engine rotates. Up to you.

Jeopardy, did yours really "Jump" when you were starting it?
 

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Discussion Starter · #13 ·
You have to remove the spark plugs and then use a ratchet to turn the crank; the nut is behind the large hex "plug" on the right side. Always turn in the direction of the arrow. Personally, I'd try the open-throttle thing first (even before fuses, though fuse is the likely answer) but it's up to you. The way I look at it, If the timing already jumped enough to cause interference, the damage is done by the first time the engine rotates. Up to you.

Jeopardy, did yours really "Jump" when you were starting it?
Yeah, I'll check the fuses anyway, so may as well rule that out first I guess. I'll try the open-throttle thing second.

On a different topic, but related to manual turning of the motor: I adjusted valves on my WR450, and I'm getting a tapping? noise. All valves ARE within spec verified by two different people several times. Decompression level seems to be functioning properly as well. I did however, turn the flywheel in the opposite direction of the way I should have been turning it, trying to get the the timing right. I believe this may have done something to cause the tapping noise. I really don't want to have to pull the flywheel if I dont' have to, any ideas on this issue?

I'll keep you updated about the SV right after I get back from lunch...thanks.
 

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You have to remove the spark plugs and then use a ratchet to turn the crank; the nut is behind the large hex "plug" on the right side. Always turn in the direction of the arrow. Personally, I'd try the open-throttle thing first (even before fuses, though fuse is the likely answer) but it's up to you. The way I look at it, If the timing already jumped enough to cause interference, the damage is done by the first time the engine rotates. Up to you.

Jeopardy, did yours really "Jump" when you were starting it?
I'm not positive what order it happened in but trying to crank it didn't make things any better, that is for sure.
 

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Discussion Starter · #16 ·
tlc- Thanks, I had the throttle WTFO and hit the go button and she screamed to life :) I've never had to even crack the throttle to get her to start, I guess she's showing her age.

Anyway, thanks for all the help everyone, back on the saddle!
 

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tlc- Thanks, I had the throttle WTFO and hit the go button and she screamed to life :) I've never had to even crack the throttle to get her to start, I guess she's showing her age.

Anyway, thanks for all the help everyone, back on the saddle!
Yay, glad you got it worked out. If it was caused by some junk in the injectors, a bottle of Techron to the next tank won't hurt it.
 

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I'm not positive what order it happened in but trying to crank it didn't make things any better, that is for sure.
/Threadjack

Since CLT's SV is back to running, what exactly happened to your bike? I missed the original story but saw this post and other in Sexy's thread.

Turning the motor backwards engages the starter, and you can hear the gear whine noise from it. So did you turn it backwards, then start it? Or are you just saying you turned it backwards, then the correct way by hand and it still jumped the timing?
 
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