SRX 600 Problem

Got her together this weekend and fired her up. Ran it through a couple heat cycles. Sounds good and seems to run good. The last run on the stand, I pinched it a couple times only for a second or 2. It appears to not be fully reving. Starting at around 6500rpm it starts to bog and fall on it's face. I think the most I seen was 7k. Again this was only for a second so it's hard to tell. We just got some snow lastnight so I will try and get it down to the lake and see what it does. Any idea's? It almost sounds to me like the spark is falling apart at high RPM's. I think I will put some new spark plug boots on just to rule it out.

SRX600.jpg
 
check the PVs for dirt and grime.
adjust the PV cables.

Really does sound like the PVx are not being pulled out at higher PRM, that would for sure cause power issues.
Unless you already checked the PVs, in which case I'll stop with the typing.
 
Sleigher said:
check the PVs for dirt and grime.
adjust the PV cables.

Really does sound like the PVx are not being pulled out at higher PRM, that would for sure cause power issues.
Unless you already checked the PVs, in which case I'll stop with the typing.
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Thanks for your input. The PV's were cleaned when the motor was apart and adjusted when it was put together. I do agree it sounds like a PV issue.
 
Alright, I just took it down to the lake to see what she does. Let it warm up good. Drove around under 20 for a couple min. Then opened her up. Major bog starting around 5500 rpm and will only rev out to around 6500. Sounds like it's loading up. Brought it home and ran it on the stand. Same thing. Took the servo motor cover off and watched it. The servo starts to flutter around the 5500 mark and continues to flutter when holding it wide open. The servo never goes full open. Upon decel, at around ~3500-4000 rpm the servo goes full open and close. Any idea's? Maybe a CDI as mentioned before?
 
A different CDI would be worth a try...probably tough to find a 600 CDI but if you could even borough a 700 CDI from a 98/99 it would at least confirm or elliminate the CDI as an issue.
 
mrviper700 said:
I have found alot on the srx600 that the cdi box seems to have a glitch in them that the sled will run decent low speed but the powervalve servo opening function of the box gets very sloppy and it gets to be erratic and it wont fully open the valves it quivers the pulley back and forth.

I have also run into this with the 98-99 700's but only a couple times and its been more to the srx600 for some reason.

definitely something to check after you get it back together.
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This pretty much describes my problem exactly!
 
Ok, I still think there is a problem with the PV not opening at high RPM's but for the hell of it, I ran it on the stand today. Idled it down to open the valves. Once open, shut it off. Disconnected the wires to the servo. Started it up again and still have trouble with high RPM reving. Seems a little better but still bad. 7k max rpm with alot of smoke (premixed first tank) and bogging. Used CDI on it's way. Anyone have any idea's?
 
Confused said:
Ok, I still think there is a problem with the PV not opening at high RPM's but for the hell of it, I ran it on the stand today. Idled it down to open the valves. Once open, shut it off. Disconnected the wires to the servo. Started it up again and still have trouble with high RPM reving. Seems a little better but still bad. 7k max rpm with alot of smoke (premixed first tank) and bogging. Used CDI on it's way. Anyone have any idea's?
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so, the oil injection tank is empty and just have premixed gas in fueltank or your running both?
 
mrviper700 said:
so, the oil injection tank is empty and just have premixed gas in fueltank or your running both?
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Running both for the first tank. Sorry for the confusion.
 
Confused said:
Running both for the first tank. Sorry for the confusion.
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ok, well the sled is now running lean, add more regular gas and see if it runs better., Your actually running the sled leaner right now with the added oil in gastank, you dont need that. Oil displaces fuel and the sled runs a leaner air /fuel ratio because you have more oil and less fuel. A srx run lean will be low on rpm.

I wont rule out a cdi box but if you have the sled lean enough it will also be low on rpm. I have changed out a couple srx cdi box on the 98-99 sleds, usually they had a wire harness problem before and that may be what damages the cdi box from the arcing on the frame.
 
mrviper700 said:
ok, well the sled is now running lean, add more regular gas and see if it runs better., Your actually running the sled leaner right now with the added oil in gastank, you dont need that. Oil displaces fuel and the sled runs a leaner air /fuel ratio because you have more oil and less fuel. A srx run lean will be low on rpm.

I wont rule out a cdi box but if you have the sled lean enough it will also be low on rpm. I have changed out a couple srx cdi box on the 98-99 sleds, usually they had a wire harness problem before and that may be what damages the cdi box from the arcing on the frame.
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I only mixed up 5 gal at 50:1 so I do have some room in the tank to add some unmixed fuel. I can give that a try tomorrow.

When the engine was out, I inspected the harness and found some rubs but nothing all the way through the insulation. Eitherway, I stripped it and re-wraped it. Snow predicted Tue into Wed.

Thanks for your input!!
 
Not sure if the CDI is in the same spot on 99's as they are on 00's but my sled had a rub thru right behind the harness connector on the CDI box. Look here too when you change the CDI out. Not sure if thats what mrviper was talking about, but looks like he might have mentioned it.
 
Unfortunately the rub threw can be literally anywhere there is wire! Under engine is most popular followed up by under bar pad/post and over by cdi.
 
Here's an update. Got the used CDI. It appears the valves are opening at WOT throttle now. The bog is still there but will rev out to 6500 and actually hit nearly 8k on the stand for a split second. I was having trouble fouling plugs. I added 5 gal of unmixed to the tank and the fouling seems to be gone. I took it to an open field and got the same results as on the stand. It pulls really well from engagement to around 6000-6500 RPM. Then it starts to bog. Doesn't matter if I bring it up slow or hammer it, same result. I also picked up new plug caps to eliminate that problem. I'm at a loss here. 50's next week :(
 
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