'97 700sx - Wtf?

SXludser

SXludser

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Nov 20, 2003
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53
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Clarkston Mi
Ok... Have had this sled for 12 years, always summarize, has NEVER let me down, has 5500-miles.....

Took it out the other day around the yard, and PTO cylinder wasn't firing off idle, fine on the main and ran great except low speed, so cleaned carbs, and of course pilots were clogged. Put back together, fired up like a champ....ran and idled perfect. drove around the yard just fine.. then headed up a hill (on the gas) and suddenly lost throttle control as the cable came out of thumb throttle (odd) it started sounding very odd like bogging or maybe even like TORS had kicked in, I hit the kill switch, stopped and fixed the throttle cable thinking no big deal, then went to fire up and nothing...????? Totally dead???

Brought it back to garage,.... its getting fuel, I know carbs are clean, have good spark, plugs are fine and looked good, spins over no problem,... pulling it, it feels like the compression is ok (although have not tested though).....using electric start it just spins and spins, but nothing...???? Any Thoughts??? Thanks for any help?
 
Not the plugs.. tried 3 new, nothing,... not the choke adjustment - not flooded, made sure to dry it out over night and nothing,... tons of spark....

With good spark electronics should not be the issue, right? yes/no/maybe?

question: what mechanically within the motor will prevent it from running? assuming it's spinning freely and seems to still have a lot of compression?
 
Well..If you have fuel, spark, + compression...it should GO!

If all the above is present in the proper strength then the only other thing I can think of is the ignition timing would have to be way out...the only way that can happen is if the flywheel loosened up and sheared the keyway so the triggers are way off.
I have never seen this happen on a Yamaha sled but anything is possible..

Have you tried putting some fuel down the plug holes to see if it fires...oil can sometimes look like fuel on the plugs, fuel directly in cylinder will definately elliminate fuel as the problem...these things tend to be simple...LOL...once you figure it out!

Bob
 
Shot starting fluid down each cylinder and it fired for a second, lurched forward,... then died,... so WTF, I have to pull the carbs again??? it should not be this difficult??? Thanks for that idea!!.... in all my frustration never occurred to me to dump fuel in there to see what happened!....

I've never had a sled die like this? I'm still having trouble believing it's the carbs?.... But based on this, I guess it has to be????...

Let me throw this question out,..... Typically even if the pilots are plugged, when you use the choke, doesn't that negate the pilots for start up? And therefore shouldn't it at least start using choke (Even with the pilots being all clogged? (which it will not)
thanks guys.
 
if it wont start on the choke then its got a fuel supply problem,you are correct in your thinking. I would look at the pulse hose going to fuel pump make sure its good and not kinked,rotted or broken.

if good:

I would then pull off the lines to the carbs and pull it over and see if gas is coming out of the line.
 
Just for grins double check that kill switch, you said when the cable came off you "hit the kill switch" then after fixing the cable the trouble started. Could it maybe still be kind of stuck between on and off, like slightly grounding it out?? Just a thought, good luck.
 
If it fires with ether, then it's not the kill switch. When you had the carburetors apart, did you pull the float needle screens? Also there are a couple of little jets at the back of the carburetor inlet that get dirty. And also did you adjust the float heights?
 
Well fella's, this is a classic,... the WTF should be on me!!!

Dug into her today,... low and behold, what do I find?.... A rag sticking out of PTO side carb????? Now I know I didn't leave it in the carb when putting things back together, however I must have let that rag fall into the box during re-assembly and didn't notice it, (Not sure how as it was white as snow)... so i'm guessing the sled will not fire if a rag is completely pulled thru and stuck in the throat of one of the carbs...LOL!!! Wow, am I cool.

I of course should have known that it would more likely be operator error than the fault what has been a bullet proof, typical Yammie....Thanks to all for the comments, Ideas, and help ;)!
 
thats funny....we all have been there done that with those kinds of mistakes, it happens.......... :o|
 
Last winter I swore up and down I blew up my SRX. No matter what I did it would not start. Turns out, I was out if gas lol
 
i put an engine in my truck one time, hooked up everything except the headers. looked up on the shelf and there was the flexplate. that sucked!! live and learn. at least it didnt cost ya anything to fix it.
 
SXludser said:
Well fella's, this is a classic,... the WTF should be on me!!!

Dug into her today,... low and behold, what do I find?.... A rag sticking out of PTO side carb????? Now I know I didn't leave it in the carb when putting things back together, however I must have let that rag fall into the box during re-assembly and didn't notice it, (Not sure how as it was white as snow)... so i'm guessing the sled will not fire if a rag is completely pulled thru and stuck in the throat of one of the carbs...LOL!!! Wow, am I cool.

I of course should have known that it would more likely be operator error than the fault what has been a bullet proof, typical Yammie....Thanks to all for the comments, Ideas, and help ;)!
Click to expand...

Commend you on being man enough to post the real problem when found!
 
s10mike said:
i put an engine in my truck one time, hooked up everything except the headers. looked up on the shelf and there was the flexplate. that sucked!! live and learn. at least it didnt cost ya anything to fix it.
Click to expand...

I remembered the flexplate, it was the torque converter that was sitting on my bench when I crawled underneath to put the bolts in :o|
 
I have definitely done things like that many times. Chaulk it up to experience. It comes with the territory of working on you own sleds. At least you were not paying by the hour for a mechanic at a dealer to troubleshoot the same problem!!!

My son is a Ford service tech at a local dealer, specializes in diesels. As the lead tech at his dealership, he gets the problem cases. A coworker replaced an intake manifold and upon start up the engine was rattling more than usual for a diesel. My son was given the job to fix the problem. Turns out the mechanic dropped a small bolt into an intake port that then made its way past the intake valve. That mistake cost the dealership $4000 in parts and labor!!!!

Glad you found it and it was simple.

Jim
 
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