sx 700 break'n down?

V

vmadmax

New member
Joined
Feb 17, 2006
Messages
37
Location
Upstate NY
looking for input, have 97 sx 700, 3,300 miles. Compression tests 118 psi in each cylinder. The carbs are spotless and tuned to spec. the spark plug color is cardbaord brown. Some times the engine feels like it is skipping, breaking down one second and perfect the next. Rebuilt the primary thinking it was hang'n up, I'm about to rebuild the secondary. Any thoughts? :o|
 
Your about due for a new stator. I have seen a few 97 700 stators fry up this winter.
 
I suppose that it could be electrical, will inspect and test. Does anyone know the proper resistance (?) for the plug wires?
 
Thanks for the link, some good reading. Friend of mine is thinking it could be the needle and the mains, thoughts?
 
Based on your comments about intermittent-ness I doubt it. Try describing the problem better. Conditions, rpm, throttle position, etc.. We could probably right you a laundry list of items to check. For instance if I just read the note, it could also be your clutch not backshifting right. We just need more info to be helpful. Be as detailed as you can get. But checking the stator is cheap and its a known issue that has some weird tradmarks. For example if you said this happens more often when the engine is hot it even lends its self more to the stator.


vmadmax said:
Thanks for the link, some good reading. Friend of mine is thinking it could be the needle and the mains, thoughts?
Click to expand...
 
I have had the spark plug wire caps go bad and they were doing just as you described. Often you will see black dust in the boot and on the top of the spark plug.
Specs for 2000 venture 700
Spark plug cap 5 Kohms @ 68*F
Ign. Coil Primary 0.05~0.07 ohms @ 68*F
Secondary 2.7 ~ 4.1 Kohms @ 68*F
 
The straange thing is the motor could be hot or cold, usually about half throttle. We lined up on a lake (hard pack)and pinned it. Sled ran up to 7300 +\- rpm (50 mph), let off for a second and it ran up to 8400 rpm (90 mph) and ran like a bat out of you ow where. I have done a quick check for bare wires have found none and I have checked all connections, clean and secure. When I get time I will check the stator using the information provided. I am going to go through the secondary with new bushings and buttons. Thanks for all the help, keep the ideas flow'n. Engages at 3800 rpm. :o|
 
Last edited:
i would say the stator, mine was acting like that when it went, then it would run but not gain any rpm without killing the motor. changed it and all was good! costly though, $330 bucks!
 
stator measurements

Some real world numbers:
Pulsar Coil - 177.5
Charge Coil - 387
Charge Coil - 75.8
The temperature at the time of test 13 degrees.
What is the effect of temperature when testing resistance?
I also need some guidlines for checking the three coils and spark plug wires.
What should the readings be? (I wish I had the luxury of a heated garage!) :o|
 
Last edited:
I put the sled indoors (warmer than initial readings) and did some serious resistance checking. Found 2 bad spark plug caps. Found the reading on the brown\red and black wires not in spec. Reading I obtained on the ignition source coil was 82 ohm, spec calls for a reading between 93 -113 ohm. Could this be the root of my problem, a costly part. Any thoughts.
 
I'd start with replacing the plug caps; they are cheap. With the temperature variations the coil may be o/k. It would likely take a few days for all the parts to warm-up throughly and your meter may not be totally accurate.
 
Replaced all three plug caps, no different. Going to pull the stator this affternoon, the whole area probably needs to be cleaned anyway :o|
 
You must log in or register to reply here.


Back
Top