Engine problems

j14hob

Member
Messages
7
Hi I got this savage 25 about two weeks been waiting for parts to turn up to use today is the first time I tried using it it’s hard to get it started then when it does sounds like it’s wot for about 3 seconds then dies but the carb is in the idle position I have put all the screws back to factory settings does this look right sorry for dumb questions haven’t had a nitro in over ten years
 

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lokky

Well-Known Member
Messages
286
If that idle gap is with throttle at neutral then it is too large, about 1mm or less. LSN looks a little lean.
 

Polar_Bus

Member
Messages
47
I'm with lokky, that carb slide gap looks to be a bit too open. First try putting your carb setting back to "baseline" :

Nitro Star S-25
High Speed Needle (HSN): 4 1/2 Turns From Closed
Low Speed Needle (LSN): 3 Turns From Closed
Idle: About 2mm

Try to get it running, if you have the same problem with the high rpm's then back the idle screw out and close that slide gap, and then start to open the gap back up incrementally. The "2mm" designation for your idle means a 2mm gap between the slide and the edge of the venturi. If you have a 2mm pin that will work as a gage.
 

j14hob

Member
Messages
7
I thought the low speed needle looks abit low but that’s 3 turns from closed I’ve opened the idle abit to try and get it to start I’m not sure how old the nitro is that came with it does it go bad I’ve ordered new nitro just incase
 

Polar_Bus

Member
Messages
47
Nitro fuel can go bad specifically nitro fuel will absorb moisture. I would ditch the old fuel and run fresh fuel.
 

ez2frag

Member
Messages
34
I’ve got some on order
+1 on the fuel. I had a new nitro driver leave a full gallon of fuel open while he ran a tank. He refueled and the vehicle wouldn't start and run. Another guy ran his truck which was running perfect, ran out of fuel and then borrowed some from mister know it all. He could not get his truck to run on it either. "Mister know it all "never could admit that he ruined a whole gallon of fuel.
Alcohol is hydroscopic, it sucks moisture in the minute you open the container.
The only other thing I can think of is that the fuel system at the "banjo" fitting on the carb, and both the high and low speed slides, and needles have old fuel residue blocking the fuel flow through the orifices.
 

j14hob

Member
Messages
7
I’ve got it running ok now I had to turn the lsn out about six turns and play with the idle all afternoon
 

Jabbo

Active Member
Messages
104
You leaned LSN SIX TURNS? Like whole turns?
 

j14hob

Member
Messages
7
This is how it is now
 

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ez2frag

Member
Messages
34
When you go to buy fuel in the hobby shop I always notice there are tons of it on the shelf, and notice that the other fuel not so much. Should tell you Traxxas isn't all that good. The 2 I recommend are Torco and VP both companies make fuel for Top fuel dragsters. 1 on my list is Torco.
 

Woodsman780

Member
Messages
11
Thanks I am in Canada it’s slim pickins unless I do a 180 dollar order I don’t want traxxes I heard not so good thanks 👍
 

ez2frag

Member
Messages
34
Torco sends it right to my house. For 44.00 it includes haz mat freight. That is for 30%. I don't know if they ship to Canada, but it might be worth a shot. Also the hobby shops here carry VP which is my second choice.
 

Polar_Bus

Member
Messages
47
My fuel of choice is Blue Thunder 20% and honestly i've tried them all and don't notice much difference between brands as long as the fuel is fresh . Blue Thunder seemed to offer the best overall ease of tuning and holding a tune.
 

olds97_lss

Well-Known Member
HPISF Supporter
Messages
2,616
Location
Dekalb, IL 60115
Traxxas fuel is fine, just seems to have a pretty high oil content.

Use what you can get. :)
 

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