1999 SRX Bogs Bad WO/ runs great 1/2 throttle

Definitely engine, it seems like it's hitting a rev limiter almost. And no matter how slow I bring the speed up, 6400 is all she wrote. it is weird when I rev it up, sometimes I can get it to miss. definitely seems to be spark related. I wonder if I can stick some of those automotive inline spark testers in there and run the sled that way.
 

Yeah, he has a 1998 I think it is the same. Do you know if the 2000 and 2001 are the same as well. It looks to me that the 1998,1999 had 3 plugs, and the 2000,2001 only has 2
 
OK, I tried to swap the CDI's tonight, and I have the exact same issue. Is there a way to check the stator for output?

I still believe it to be an ignition miss, the thing started in 1 pull, and idles like a champ. The headlight never seems to dim, however I think the charging coil for the headlight is a different part of the stator than the part that feeds the CDI and the coils, am I correct in this assumption?

Any help would be appreciated.
 
Are you talking about the sensor right in the middle of the CARBS ? if so, how do I check it. My last one had that thing disconnected, and was just looped back onto itself.
 
toolman11k said:
I had a 1998 SRX for 8 years before this 1999 and had no issues.

Cleaned carbs every year. Now I just bought this 1999 and it was fouling the left plug(near clutch)

I cleaned the carbs, and installed new plugs, it now idles good, and if I drive it less than 1/2 throttle, all seems ok, if I floor it, it just noses over, and appears to be running pig rich.

I think maybe the power valves could be a issue, does anyone have any suggestions, is there a way to run them manually, or some other way of testing them?

My other thought was weak coils, however that seems to be a stretch.

Any good advice would be appreciated, I am a good mechanic, so I am willing to test anything. Also if I can't get steered in the right direction, I can borrow my buddies 1998 SRX and swap some parts.

Thanks
Click to expand...
have you tried bypassing the throttle override switch?
 
sounds familiar to me.

I had a similar problem on my 2000 vmax 700. There is one coil for low speed and one coil for high speed, it runs fine on idle and up to a certain rpm cause the low speed coil is fine, high speed coil is shot. Carful runnin it like that will blow your ignition box, happened to me. So I changed it, Changed the high speed coil and put 3 new spark plugs and off I went havnt had any trouble since. I dont know for sure if its the same set up on the srx but I believe it is. Let me know if I was any help.
 
Are these coils you speak of located on the stator? or are you talking ignition coils? there are only 3 ignition coils, and they fire for low and high RPM?
 
No vibration at the higher rpm you can get it to? The 700's are known for screwed up cranks.
I'd try new plug caps and check & clean your power valves (easy way ...drop the idle down under 900 and you'll see them get pulled open).
Corey
 
Checked the power valves already, they seem to be moving fine, I ohmed all the plug wires, and coils, no vibration, it's like someone is just shutting of the spark, it also has some weird spark issues after test riding it, I come back, and if I power brake it, it starts missing. definitely seems to be a spark issue to me.
 
toolman11k said:
OK, I tried to swap the CDI's tonight, and I have the exact same issue. Is there a way to check the stator for output?
Click to expand...

No it wouldn't have been TORS, TORS limits rpm's to around 3,000,and your
getting more then that..

i would post a scamatic for ya to check stator/pickup coil but i only
have 2000 and up SRX,maybe someone with a '98-99 book can post...
 
yes the stator is what I am reffering too. Look into it, I really think your problem might be related to the same thing. Go to a yamaha dealer and ask someone who knows there sleds about it. Get the part and change it.
Good luck
 
your problem is it has a leak in the base. i have a 99 srx 600 and i work at a dealer. pull the pto side pipe and check and see if the bottom end of the engine looks wet. if it is it is leaking causing loss in crank case preasure wich 2 strokes need. my did the exact samething, im almost positive
 
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Well, I will check that when I pull the pipes to put the stator in, the only weird thing it the intermittent firing when I power brake it after trying to make a full throttle run. This leads me to believe it's an ignition issue. But I will take any advise, I will check it.
 
Hey, my Viper did that for awhile. I ended up finding the six or seven wires that go to the voltage regulator (right side of sled, above foot hoop) were broken inside the wires and sometimes touching sometimes not. It would miss real bad and then go and then sometimes just shut off. I remember near the end it would kill the engine from pulling the brake and make the tach go up and down. Just my 2$ worth.
good luck
 
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