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Nitro Hammer Water Cooling Engine Question

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Nitro Hammer Water Cooling Engine Question

Old 04-16-2004, 10:19 PM
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Default Nitro Hammer Water Cooling Engine Question

Hi All,
and thanks for your time in advance.
Well I bought an Nitro Hammer. I have had lots of problems with this boat. First, I read here about it. Mine DID come with the broken prop. No big deal there..just went to my LHS and bought a packet of 2 for like 5 bucks. I can handle that. Next...the thing WOULDN'T start for some reason. It says in the !QUOT!break-in!QUOT! video NOT TO TOUCH the IDLE needle for ANY REASON during break in. Well the only way to start the boat was to hold the throttle in a little. So I tried to adjust the throttle needle using the screw head..but to no avail. SO I had to take the servo arm off and actually pull it back and re attach a bit. This helped TREMENDOUSLY! Now it was running and I could do the break in and run the engine a bit. It was better. But I noticed that after I had turned the high speed needle up a bit and the boat was running GOOD! that after running it real fast for a while the engine would !QUOT!bog!QUOT! a bit and slow down. I figured this was due to maybe it was over heating a bit. But it's supposed to have water cooling through the engine. Well I ran it with the cover off for a bit and noticed that helped a BUNCH. But still when it got hot it would slow down. so I brought it in and left the rear in the water and watched as NO water was making it through the tubes for the water cooling. some was sputtering a bit...but not enough to really keep things cool. I then unplugged the tubes and blew them out fearing a !QUOT!clog!QUOT! of some sort. That helped quite a bit. My question is. Is there ANY way to increase the amount of water flow through those tubes?


P.S. in case you need to know, the water is fed through the engine from a tube that's connected to a little pipe that is pointed at the props backwash. I'm guessing this is so the water propelled from the prop is kicked into the pipe and through the tube, then into the engine head and out the other end.
Old 04-17-2004, 01:41 PM
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Default RE: Nitro Hammer Water Cooling Engine Question

Maybe youre running it too lean. Richen it up a tiny bit and see if that helps.
Old 04-17-2004, 06:16 PM
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Default RE: Nitro Hammer Water Cooling Engine Question

The motor doesn't need a lot of water flowing through it but it's a good thing that you found something clogging the flow. With the cold water that you still have in Indiana, it will be cooling the motor more than is needed right now. I found this out today myself as we took 2 boats out, one water-cooled, the other air-cooled.
Running with the cowling on will pump hot air into the carb so most people suggest drilling a 1" diameter hole above the carb to get some cool air to it.

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