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my new xl 5.9

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goggles

goggles

RC Newbie
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  1. Bashing
just picked up my new savage xl,,trying to break it in and it seems to run good up until it reaches about 220 degrees then all of a sudden it just revs up like crazy until i shut it down,,,sure could use some advice :whhooo:
 
Sounds like the idle is high or the engine has air leaks. How high is high? Is it taking off on ya? Or just creeping? The Axial .36 isn't well known for reliability, but can run good when sealed properly.
 
mine did the same thing,, once i sealed the engine it ran fine,, just seal the backplate,,carb,,and the carb pinch bolt,,w/high temp sealant ,,let it cure for 24 hrs,,
 
2revo1maxx said:
Sounds like the idle is high or the engine has air leaks. How high is high? Is it taking off on ya? Or just creeping? The Axial .36 isn't well known for reliability, but can run good when sealed properly.
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yeh it takes off to super high RPM,but i will try sealing it up and see how that works,,,,,,,Thanks
 
Read the tuning tips and tricks in the nitro forum. If your gonna seal it, seal everything. The sticky explains sealing in detail. Let us know how it runs afterwords.
 
well,,,took the engine out,sealed everything that was suggested i do,,let it sit and cure,,and ,,well it still go wild when it hits 230-240 degrees
 
are you saying your running it until it reaches those temps or are you idling it on a box?

seems odd that it would rev out of control like that. Most of the time these engines come with needles settings that are richer than necessary and people have to lean them out just to get them started and idling properly.
 
2revo1maxx said:
It's gotta be too lean or you have the linkage out of whackk. Does it sound like chewbacca at 'idle'?
Click to expand...

well i tryed screwing out the needle at least 2 turns past stock settings,,,seems to run nice and smooth,sitting on a stand,,until it hits 220 plus degrees,then starts racing a bit,,then she go"s into wild mode:\

JessF said:
are you saying your running it until it reaches those temps or are you idling it on a box?

seems odd that it would rev out of control like that. Most of the time these engines come with needles settings that are richer than necessary and people have to lean them out just to get them started and idling properly.
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yes its sitting on a stand a nd reaches that temp just idling away until its turns into my ex wife and gos wild:hehe:
 
few obvious questions out of the way:
-transmitter is on?
-how are you checking the temp?
-how long does it take before it hits 200+ sitting on a box?


Depending on how long it's been sitting on the box, by the time it gets to 200+ you might be running out of fuel. A nearly empty to empty tank can cause a temporary lean condition just before the fuel runs dry and the engine clicks off. You'd experience the same thing if you pinched the fuel line and waited for the fuel in the line to run dry. It can be an odd experience if you've never run a nitro before. Even when the engine is all broken in and ready to go you'll experience this lean condition a few seconds before the tank runs dry. The k5.9 is a thirsty engine so have a fuel bottle at the ready.

A common issue with savages is the fuel tank design causing a mid-tank lean condition. I never experienced this issue but I also didn't keep my savage. Check for air leaks around the fuel tank, cracks and such. Take the tank off, empty all fuel, then submerge the tank in water and look for air bubbles. The fill lid should seal nicely and no water should be able to get into the tank. With the tank still submerged, blow into one of the fuel lines, you should still see no bubbles.
 
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JessF said:
few obvious questions out of the way:
-transmitter is on?
-how are you checking the temp?
-how long does it take before it hits 200+ sitting on a box?


Depending on how long it's been sitting on the box, by the time it gets to 200+ you might be running out of fuel. A nearly empty to empty tank can cause a temporary lean condition just before the fuel runs dry and the engine clicks off. You'd experience the same thing if you pinched the fuel line and waited for the fuel in the line to run dry. It can be an odd experience if you've never run a nitro before. Even when the engine is all broken in and ready to go you'll experience this lean condition a few seconds before the tank runs dry. The k5.9 is a thirsty engine so have a fuel bottle at the ready.

A common issue with savages is the fuel tank design causing a mid-tank lean condition. I never experienced this issue but I also didn't keep my savage. Check for air leaks around the fuel tank, cracks and such. Take the tank off, empty all fuel, then submerge the tank in water and look for air bubbles. The fill lid should seal nicely and no water should be able to get into the tank. With the tank still submerged, blow into one of the fuel lines, you should still see no bubbles.
Click to expand...

--yes the transmitter is on
--checking the temp with a lazer heat gun
--it takes about 4-5 minutes of run time to reach 200+ degrees
--i will take the tank off and do like u said and check all that stuff out,,,thanks :\
 
humm weird. Where in Canada are you located? It sounds like one of those problems with a simple answer but you'd need to be there to fully understand the issue.

is this your first nitro?


when you say "checking the temp with a lazer heat gun"

are you referring to a heat gun that has a lazer on it, or an inferred camera type with a lazer pointer. There's about an $2000 dollar difference between the two.

just saying, if it's one of the cheap inferred themps guns with a lazer pointer on it and your pointing the lazer at the head of the engine, the part that's actually taking the temp is pointing at the wrong place, giving you a false reading.
 
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The outside temp is insanely cold, and doing it in the shop can kill you.
However you're doing the break in now, you're doing it wrong.
You will NEVER achieve the goals required to properly break it in unless you wait for warmer weather.
 
thanks to the advice from everyone,,,,decided to put new fuel line on as a last resort,,,,low and behold it runs fine,,,the hpi fuel line was rotten or something,,held it under water and blew in it,,,,result,,,lots of bubbles,,,thanks again to all the great advice
 

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