SRX Problem!!!

taylzee

taylzee

New member
Joined
Feb 6, 2006
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505
Age
51
Location
Flat Lands, Canada
I have 98 SRX in my garage that needs help! All of a sudden this thing falls flat on it's face at 5500rpm. I've checked reeds, carbs, PVs, Clutching, Stator (I haven't pulled, but ohmed out and looks good). Pistons, wash, plugs all look good!

The only thing I've noticed is that the servo doesn't actuate @ 5000rpm. It does cycle on start up which I believe is telling me that the cdi is sending signal? (Is my thinking correct here?) If so why is it not actuating @ 5000rpm?

I should mention that this is a very modded unit so there is no codes to report as there is no gauge pod other than digitron. And all the wire routing has been moved so wire rubs are not likely but not impossible. It happend very sudden and is NOT intermittent. It is always there now.

There was no vibration and I am very confident this crank was welded and trued.

I have been reading alot of past posts but have not found anything that may remedy this situation.

I am 99.5% sure it is not TORS as it happens at 5500rpm and I have it bypased. I even went as far as grounding the cdi output.

Any ideas out there before I get a head hurt going?
 
Even if power valves were not working at all it will still rev much higher than that.. They should start to move at that rpm though..
 
I guess I could pull the PVs and run it to see if it makes any improvement.

I am not real up on the PV motors. I've alway run redheads. I read in one post about a low and high output coil. Everything tests out as per manual spec but I did notice that there is another coild for the stator circuit.

Anyone have any insight on this?
 
Found something!!!

So went in to look at the shat key and the good news is that the key was in the right spot and everything was tight. The bad news is that the stator appears to be burnt.

Have a look.

Can someone shed some light on why this ohemd out fine?

The other thing I would like someone to shed some light on is why it would start and idle fine but fall flat at 5500rpm? It wouldn`t die just fall flat!

The only thing that makes sense is that there is 2 seperate coil circuits, one for low rpm and 1 for high rpm and the one thats burnt is for the high rpm. If so how does this work? Is the cdi input from the high rpm coil set for a minumum voltage?

The other thing that has me pondering is that the servo would cycle on start but not operate when 5000rpm was achieved.

Anyone with some light? It's pretty dark in here!!!
 

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Not really any light for ya mr. Other than i just repaired the same problem on an 08 srx with a bender 835 kit. The sled started great, idled fine but as soon as you throttle it up flat on its face. Tested the stator ohm readings, tested fine. warmed the machine up and re-tested Not so fine. One new stator later and never ran better
 
Servo starts to activate above 5000 rpm, should see it start to jiggle between 5 & 6 thousand rpm, it starts to open steadily over 6,500 to max.. If it cycles at start up and you don't have any code lights flashing should be good to go..
 
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dont know if yamaha has highspeed lowspeed stator like outboards, but it looks like current was jumping there, so it would ohms right but when running the voltage would increase and jump right there, fastest path to ground, that stator is junk! to bad it wasnt just the key that would have been a little cheaper lol
 
I suspect your stator. You should be able to pick up a used one on here fairly cheap.
 
I am sure with the stator looking like that, it's the problem, just not sure why the servo would cylce on start up and not activate at 5000 rpm unless there was a high rpm coil. It makes sense in my mind but so do a lot of things that don't in the real world!!!
We are going to put a new stator in and see what happens. Should be here in a few days.
One of the things to note here is the state of the valves. He picked this sled up at the end of last season. We cleaned the valves at the start of this season and he put on maybe 5/600kms. When I started trouble shooting the sled, I pulled the valves and they were crazy dirty. Could hardly get them out. So I am thinking that servo hasn't been serving for a while. He didn't complain about performance but if they weren't working from the get go, he wouldn't know the difference. It will be interesting to see if this thing wakes right up after getting a new stator and the servo starts serving again!
 
Does anyone have a used one for a 98?
Just priced a new one out North of the Border here and all I can say is ouch!

I will also post in the want adds!
 
taylzee said:
Does anyone have a used one for a 98?
Just priced a new one out North of the Border here and all I can say is ouch!

I will also post in the want adds!
Click to expand...
by a new one you thank yourself later. They do wear out. I bought a used stator last year that did work but the sled was never harder to start especially in sub zero weather. I bought a new one this year and since Ive put it in the sled has started every 3rd pull no question. It even sounds better when it stats like Im getting spark way quicker. I used to have to pull as fast as i could to get it started now I stay seated and gently pull. Jmo.
 
So got her going strong today. New stator went in and got everything back in order. Fired her up and it was better but the servo was still not serving. Pulled all wiring and found brown/red from stator to CDI rubbed through and shorting. Fixed it up and it ran like a dream. So I am thinking that the short caused the stator to go because the wire that appears to have burntfirst is the br/R.

Thanks to everyone that helped me out.
 
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