I just got my boat back from the shop the other day and i was running it at work here to see how it ran. I had the water hose hooked up so it had the cooling going on. My question is, when i started it it cranked right up and the temp gauge came up to about 100 after a mintue. It took another 2 minutes for it to go to 140. However, right after that it climbed rapidly up to the limit on the gauge of 240 in about a minute. Its a 460 with basset twisty headers. JP Marine tuned it up and readjusted the carb, when i picked it up Joe at JP Marine said she was running good.

Is this the normal operating temp? or is it climbing that fast because the jet is not taking in serious amounts of water like it would on a lake?

What temps do you guys run at?

One more question, when i had it running at idle at work i noticed when i looked into the nozzle of the jet that the impeller was not spinning. It was my impression that it would still turn even with the engine at idle. Or is it that it needs to be sucking in water for it to be spinning.

Sorry for all the rookie questions, im just trying to get the best understanding of how things work but i know the best learning platform is taking it out to the lake and actually doing it.

I would say that you have one of two isses one is that your ball valve was only open a little bit.

the other is that the slide valve was not closed to the water you were pumping in was jusg going right back out
with out passing throught the engine.

I would look for a ball valve some where by the water neck on the engine and a faucet type valve by the rear
of the engine or by the pump.

Firefly, you were looking at the back (inside) of your bowl. The only way to see the impellor is from underneath the boat looking up into the inside of the pump.

Glad you found that valve!

Did Joe at JP tell you to leave that valve open? I could swear that Joe told my friend Mike to only have that valve open above 1500-2000 RPM. It's probably a different style of valve, or??

I just ran the boat again, this time with the valve OPEN! The temp got up to about 190 after about 7 or 8 mintues but stayed there. From what i have been reading here its NOT a good idea to run the engine for any extended period of time out of the lake, for the engine sake as well as the pump because the garden hose just doesnt provide enough water. Is my take on this correct?

Emanon,
  It is a jet and i will never do that again, i feel like a shmuck!

Hotrod,
  Im pretty sure i heard correctly when Joe told me to leave it open 3/4 all the time due to the fact that the switch/valve is located by the engine and not accesible from the drivers seat. Joe had said that if the switch was located by the drivers seat as it is in some boats then to open it at the described RPM. He said it wasnt a big deal with my situation and that your not gonna destroy the headers because of the strength of Bassett headers. There just starting to blue so there still breaking in. I might be wrong but im pretty sure thats what he said when i picked it up. Anybody have any other input on this situation?

Man thats a great idea to put the valve by the seat I'm constiantly jumping to the back to close it.

Yea, when i got mine serviced, JP Marine put a Bassett t-valve on there. Joe told me to leave the switch open at 3/4. The water does shut off at idle and comes back on at about 1500 rpm.