bleedin-blue
New member
Here goes, 97 700SX. Idles fine, but when rev'ed up it stumbles. It sounds like the TORS is kicking in. I've tried bypassing the TORS, but nothing changed. I got the sled running last week and took it for a spin on our property. Everything seemed fine and it ran strong. I was running down a dirt trail and went over a small bump. Upon landing the sled backfired and my problems began. I was able to get it to rev again and rode it to the house. SInce then it will not engage the clutch because of the motor cutting out.
Here's some checks I've gone through so far. I've been through the carbs. Cylinders all have 125 ft lbs of compression. All 3 spark plugs fire blue upon cranking. Lights and dash all work and do not seem dim. Some wiring checks for possible breaks or grounding have been done. I pulled the harness that runs underneath the motor and the wires seem fine. No rubbing or kinks. While running I have moved some of the wiring around to see if there are any changes, nothing. I pulled both relays/resistors (?) by the right foot well and no change. I did find that one of the wires going to the thermosensor on top of the head was broken off. I tried holding it on there while running with no change. Could this be the break in the system that would cut the motor out while reving? Maybe thinking it's over heating? If this has nothing to do with the problem, I'd like to keep looking for the problem while the sensor is being delivered. There is a recent post that has some stator specs for a different year sled. Can I use those numbers?
Any ideas or help would be greatly appreciated.
Thanks
Here's some checks I've gone through so far. I've been through the carbs. Cylinders all have 125 ft lbs of compression. All 3 spark plugs fire blue upon cranking. Lights and dash all work and do not seem dim. Some wiring checks for possible breaks or grounding have been done. I pulled the harness that runs underneath the motor and the wires seem fine. No rubbing or kinks. While running I have moved some of the wiring around to see if there are any changes, nothing. I pulled both relays/resistors (?) by the right foot well and no change. I did find that one of the wires going to the thermosensor on top of the head was broken off. I tried holding it on there while running with no change. Could this be the break in the system that would cut the motor out while reving? Maybe thinking it's over heating? If this has nothing to do with the problem, I'd like to keep looking for the problem while the sensor is being delivered. There is a recent post that has some stator specs for a different year sled. Can I use those numbers?
Any ideas or help would be greatly appreciated.
Thanks
You bypassed the tors switch down by the carbs only, putting the two ends of wires together from sled harness, not carb harness right?
you need the stator specs for the old ignition system, 175 watt.
let me ask you this, if you unplug the headlight bulb and the rear tailight bulb will the sled rev up?
you need the stator specs for the old ignition system, 175 watt.
let me ask you this, if you unplug the headlight bulb and the rear tailight bulb will the sled rev up?
I found the specs for the stator but lets check a few things before we jump to conclusions, do the checks in the first post and let me know, thanx
Yamahasrx700
Member
This sounds ridiculous but the spark plug boots has internal moving parts. In order to have a resistor there is a small carbon rod with a spring that holds the carbon rod against the contact for the spark plug. I had a similar problem with my 97 SX. I put my coils on my buddies SX and he started having the problem. I put new coils on, and that did not fix it (I did not replace the wires). One day I pulled the plug wire and the spark plug boot made a slight clanking noise. I sectioned the boot and found the small spring was broken. I bought new boots for 3 bucks each and the problem was gone. My problem was very intermittent.
yamaholic22
Active member
yup sounds like a stator, or plug wires or boots. All seem to be very common on the '97s for some reason. Luckily both aren't very hard to fix and not too crazy expensive. Try the checks mrviper gave you and then you will know if its the stator. Headlight and taillight may be drawing too much to allow the sled to have enough power left for ignition.