300/440/550 650sx Rattle and RPM question

[Sidsol]

So i added new carbs to the ski and was wonder what is the peak RPM of a 650sx motor?

Also when it runs out of the water it makes rattles sounds from the shaft but in the water it purrs like a kitten ... should I be worried or should i be looking to replace something?

 

[Sidsol]

help?

 

[dbredleader]

sx rattle

This rattle is normal out of the water. Run the piss out of it. IDK rpm max

 

[Pro-pulsion]

Max RPM is around 6200 on stock electrical.

 

[Cliff]

mine use to read high 67s to 6800 with a tiny tach. may not be the most accurate tach. they all rattle out of the water. continue beating it

 

[WFO Speedracer]

The fit between the shaft splines and impeller is not ideal thus the pump rattle when the pump is unloaded.Ride it like you stole it.

 

[akjetpilot]

amen

 

[Mile9c1]

Max RPM is around 6200 on stock electrical.

Weak!!

 

[kevbo]

1993-1995 sx/x2 ignitions will rev to 6900rpm. 1989-1992 rev limits were lower. On the water its unlikely to turn more than 6500 with a stock cylinder regardless of ignition or other mods.