99 SRX 700 nightmare

A

alandry78

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Joined
Feb 22, 2017
Messages
5
Location
Elk Lake, ON, Canada
Website
www.viagrasansordonnancefr.com
Here's the situation, traded my 06 summit for a 99 700srx, ran whne i got it but kept backfiring. I've gone through the posts, pulled the engine, tore it down re-sealed the engine completely cause there was nothing wrong with it, crank welded and not out of phase. Wife found a few rub through wires so we went through the whole harness and fixed all broken areas. I cleaned the carbs out many times with my ultra sonic cleaning tub, synced and back on. Fired it up and still backfiring. bought new yamaha coils, installed them and still backfiring. Bought 2 used stators of working teardown sleds and still not working properly. Fires up with fuel down plugs and dies but sounded good while running. Any help is appreciated, i'm ready to get rid of this nightmare and stick to my Mach z.


Thanks
Andre in Northern Ontario
 

when it starts to die, try flipping choke on. Does it help ?
can it run on half choke well?

if choke affects it for the better, I would guess you have a fuel issue.
You think its not getting enough fuel or too much ?
 
I'm lost here so just throwing this out there is the pick up for the ignition keyed? Maybe the flywheel isnt in the correct location? Like a sheared key and it's trying to fire at the wrong time?
 
all that is done, you are onto cleaning the clutches next. they get over looked a lot and I was guilty of that.
 
Would clutches really make it backfire like that? I'm not new to working on these sleds but I would have never looked at clutches for a misfire. Is there any way to swap the ignition pickup fro the sled the is running well and the sled that is backfiring? Wish I was there to help try diagnose this it's very puzzling.
 
Did you change the plug caps? They made my SX run really strange, and misfire when cold. I would be looking at something electrical still. I've also heard stories of the tail light wire shortening, making the sled a nightmare. Also, is the crank runout checked?
 
Last edited:
norwegian said:
Did you change the plug caps? They made my SX run really strange, and misfire when cold. I would be looking at something electrical still. I've also heard stories of the tail light wire shortening, making the sled a nightmare. Also, is the crank runout checked?
Click to expand...
Well I was having similar grief with mine fuel filter was broken off and it plugged those little basket screens where the needle sits in I didn’t realize you could pull those out and were they ever plugged
 
alandry78 said:
Here's the situation, traded my 06 summit for a 99 700srx, ran whne i got it but kept backfiring. I've gone through the posts, pulled the engine, tore it down re-sealed the engine completely cause there was nothing wrong with it, crank welded and not out of phase. Wife found a few rub through wires so we went through the whole harness and fixed all broken areas. I cleaned the carbs out many times with my ultra sonic cleaning tub, synced and back on. Fired it up and still backfiring. bought new yamaha coils, installed them and still backfiring. Bought 2 used stators of working teardown sleds and still not working properly. Fires up with fuel down plugs and dies but sounded good while running. Any help is appreciated, i'm ready to get rid of this nightmare and stick to my Mach z.


Thanks
Andre in Northern Ontario
Click to expand...

so this sled will not fire on its own using the choke unless you put raw fuel into the cylinders?? need better description as to how it starts and back fires, a video will also help diagnoses the problem.
 
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