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Summit X 670 running great until 45 MPH

So I've been through everything on this sled now, carbs, tank, rave valves, air box suspension the whole nine. This sled has never ran better as far as runnability goes, lots of love will do that I guess. So you think I've been running from the little black box bolted on the coolant resevoir. Makes sense thats the only part that aint been changed or cleaned and rebuilt. Where do you think is the best place to get one of those bad boys?

Josh
 
Bolted to the coolant reservoir. That is the one that went bad on my 99x while under warranty. Those things are a little pricey so if you could swap out with another sled to make sure that would be a good idea. $350-500 I believe.

Ck the swap meet, ebay or other used source. Gotta be someone out there with a sled they are parting out.
 
Is it hitting full RPM, If not will it with the Belt off. If so check clutches for worn or failed parts, if not the clutches check for intake leaks sticky power valves cracked bellows in power valves. Just some thoughts
 
If you find its the box. Let me know as I have one of a 99 670x that has less than 500mi. on it.
Went with boost and to make it live had to switch to a 98 box and rotor valve.
pm me if needed..
 
could be the ignition modual aka the black boxs on the coolant resivior. or maybe try your coil on the oppisite side of the resivior, inbtween that and the air box. you'll have to take the air box out to see it, its just a black cylinder with wires coming out going to your spark plugs.
 
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