98 Mountain SRX Overreving?

Is it new to you?
We need a lot more info on the history of this sled if you expect help.
If it,s set up for the mountains & you rode it in ND you probably allready hurt the motor.

Ther is a big diff in black hills/nd jetting. Your gonna need to add a ton of weight to the primary to bring down rpm,s. Run the stock 98 srx jetting before you ride it again if it,s not too late allready.
The 98 srx clutching was horrible stock & needs a lot of tweaking. You should be 8400 rpm tops at wot.

Jetting can make or brake your sled. If its jetted wrong and running lean you can melt it down before you realize it. Have you pulled the carbs and checked what Main Jets, Pilot Jets, where the Needle sits and where the Fuel screw is adjusted too? The numbers on the jets can be a little hard to read but if you can let me know those I can give you a rough idea of what it's set up for.

I've got the jetting chart for 98SRX as that's the sled I'm running and can get those on Tuesday when I get back home. It takes into account Elevation and Temp so if you can give me those for where you will be running I can let you know what the jet chart shows. (Someone correct me if I'm wrong, but if you jet for a lower elevation when you are running at a higher elevation it will be running richer. You're safer doing that so when you are at the lower elevations your not running lean.) Mines jetted for 3500-5000 at 20 degrees. I mostly ride about 4400-6000, but I have been playing with jetting still and checking piston wash/plug coloration. The chart isn't a fool proof method as nothing is in life, but gives you an idea of what to expect and where to start. The SRX runs a larger jet on the pipe side carb as it tends to heat up easier to from what I've been told and the chart shows that.

You also mentioned that your pipe is cracked, this could affect the carb jetting and you may want to fix it soon (or maybe I'm over paranoid). If the pipes are not the stock tripple pipes then jetting may be different too. I may have the clutching chart to give you an idea, but clutching is something you can play with and adjust until your blue in the face and not be satisfied with.

As for overheating there is a lot that can cause that. What is the temp light doing? The light will flash 3 times on start up then depending on how many flashes will tell you other things like the powervalve servo motor is not working but I do beleive will be on solid if your running too hot. What else is the sled doing and how long does it take to get hot? Hopefully I can be of help and have made sense. There are also some other sites that have great information on Yamaha sleds only. They are older and heavy sleds but set up right will run forever.

On my 98 MSRX I was having the same problem with it grabbing 9000-9200. A buddy that worked on some of the early yamaha race teams told me to use the weights out of a 2001 SRX. It was a different sled after that. Rpm's dropped back to spec.

Sorry, read overreving and thought overheating...long day yesterday. When I get back home tomorrow and I should be able to track down the Jetting Chart and the Clutch chart for you

jetting should be 146.3/146.3/148.8
clip in #3 (middle)
fuel screw out 1 1/8 turns

You really have to load the stock 8dn weights super heavy to get rpm,s down. You want at least a 4.5 gram rivet in each hole with a 1 gram washer peened in between the weight & rivet. run a w-w-w primary spring also. The 8dn-20 weights from a 00-01 700 srx work way better loaded up with 4.4 rivets.

rebuild when it goes down otherwise ride it. 10 000 miles on my dads sx then he sold it.

is there any mods done pipes etc?

i wouldn't worry about it till around 8000 mile then maybe re ring it. those motors are incredible if you look after them. they like clean carbs and good oil!

Check your gearing also. When I left my mountain gears in my srx and put my flatland wieghts in the clutch I was overreving at 1/3-1/2 throttle. Maybe whoever had the sled before you geared it lower so that will throw your clutching off too.