View Full Version : 7,000 feet above sea level
I have a nitro hammer and I was wondering if I need to mess with the low speed jet? Also would it be o.k. to take the shim out of the head because of elivation? We tried going from 2 to 1 1/4 on the high speed and it doesn't seem to make a difference. What should I do?????????
Any help would be great
:rolleyes:
I also want to know if I can find a prop with less pitch then the factory.
Hydro Junkie
08-13-2004, 10:44 PM
DO NOT REMOVE THE HEAD SHIM. Engine damage can result from lack of clearance. What kinds of problems are you having?
The boat just will not rev out on full throttle. Sometimes it also will just dog out and it killed a couple of times.
abx131
08-14-2004, 12:36 PM
Open up the jets, you have a lot of thin air to compensate for.
So your saying I want more fuel to enter the carb? I thought it should be a little leaner so the fuel to air ratio is about the same as sea level
water dog
08-14-2004, 04:34 PM
I do believe you you turn the hsn in to lean but watch out for engine over heating.
The engine won't run consistent. I talked to a guy who knows a lot about planes and he sayed it could be sucking air somewhere else. I noticed when I prime the engine fuel comes out of the carb around a bolt. Is this normal. Here is a pic of the bolt.
abx131
08-14-2004, 10:06 PM
Correct me if I am wrong, but the higher the altitude, the less air there is. To compensate you need to open the air mix screw to allow more air? Is that right.
The jets on the nitro hammer only control the fuel, not the air. Down at sea level the jets can let more gas because of the amount of air down there. Up here, in order to get the same mixture you have to lean it because of the lack of air.
Hello, Please help!!!!! Should the Carb leak fuel when primed?
bufferoo
08-14-2004, 11:41 PM
No, your carb shouldn't leak fuel out of any of it's fittings. That would be a problem if yours is.
I would suggest taking the carb apart (ONLY if you are fully comfortable with that) and making sure that it is clean. Put a little bit of sealant on the threads as you put it back together esspecially where you saw the fuel leakign from. That should help.
As far as I know you definitely want to lean out the hight speed needle when you go up in elevation but you should be able to go up in nitro as well. That should give you a bit better performance. If you're running 20% now, try 30% and see what it gives you.
Bufferoo
O.k. Thanks. How does the carb come off the engine. The rest I can figure out.
Does the Carb bolt on the engine by the nut on the right side when looking from the back to the front of the boat. When I get it off will I have any problems getting it back on.
BoatDoc
08-15-2004, 07:59 AM
you got it. loosen that nut and the carb will pull straight out. it will slide right back in when you're done. here's an idea. you may want to look into another carburetor. one with a bigger throat diameter will let the engine draw more air. at your altitude you're dealing with pretty thin air, so you may never get full power from any engine without a little extra tweaking and tuning.
CFRACR
08-15-2004, 08:50 AM
(ejp)- Have You Cut A Hole In The Canopy Above The Carb? Or Build A Scoop?
Either Should Help. The Scoop Looks Better!
Yes I drilled a half inch holes right in front of each cockpit.
Yes!!!!! I got my carb to stop leaking. The only place it is leaking now is where the carb bolts on. Not the o ring but the black pin. The side that doesn't have the nut leaks. I put some sealer over it, hope that makes a difference. Does anyone else have an idea how to stop this from happening????????
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