Issue with idle...

[SavagePower]

about half gallon into my new SH .28. Has been experiencing this issue since the beginning.

When the engine first starts, idle is good. Drive for couple seconds and come back, idle goes up. I then try to lower the idle, the ldle goes back down again, drive again, come back, idle goes up again. Then I try to lower the idle again and idle goes back to normal.

This cycle continues until the idle is way too low and the engine just dies.

LSN is on the rich side. NO matter how much I richen up the LSN or the lowering the idle, after couple throttles, the idle will go up.

 

[Pope]

Sounds like your HSN is lean causing the idle to hang up till the LSN catchs up.

 

[Pope]

Take a look at this it will help.

https://www.hpisavageforum.com/forums/showthread.php?t=12260

 

[SavagePower]

Sounds like your HSN is lean causing the idle to hang up till the LSN catchs up.

Here are the steps:

1. Full Throttle
2. Let go of throttle, the idles go down to normal.
3. After couple seconds, idle starts going up.

This sounds like a lean LSN, but I richened it a lot already and it still does that.

 

[Pope]

Ok I get you now.

Take the airfilter off. Make Idle gap .8-1mm underfull break and retune.

 

[Os.savageboy]

Ok I get you now.

Take the airfilter off. Make Idle gap .8-1mm underfull break and retune.

good info here! this will cure your problem I'm sure, I would also lean the lsn a tad.

 

[SavagePower]

Ok, I changed the needles back to stock settings and I still can't get it to idle down.

I try to bring the idle down with both idle screw and LSN but after a throttle or two, the idle goes up again.

I took a video of my truck, could this be a air leak? It glitches sometimes but the servo horn is not moving.

http://www.youtube.com/watch?v=gK4832bWowU

 

[Pope]

I would start with the ofna throttal mod the stock servo saver could be your problem.

 

[nitrobashin]

Heres a problem i had. With the glitching. Check your clutch shoes.See if they are catching on the fly wheel when returning to idle if so file down till action is smooth. It solved it for me.The shoes were not returnin all the way making my idle way to high. Good luck!

 

[Bankrupter]

that vid is kill your motor lean for starters. you cant run that tank from full to empty. This is why most of us with hi power mills do mind tanks.(I noted from vid it was at the bottom of the tank) with a stock LRP full tank to bottom of the tank where the vid is, is almost a full turn out (richer). Race tune to race tune...

the shudder you are calling "glitching" is bad tuning and lean sounds that are normal to a very bad tune. there is nothing wrong with that other then the tune

 

[SavagePower]

ok tomorrow, i will return all the needle settings back to factory and retune.

 

[ibanez890]

i noticed my idle was going up to, until i noticed it tapped the throttle trim button on my TX by mistake, causing my idle to be slightly higher due to the carb begin open that tiny little bit

 

[SavagePower]

I was able to bring the idle down now. I did a pinch test and the engine died almost immediately, so I richened up the LSN. But the weird thing is that a lot of fuel are coming out from the exhaust already, but I still have to richen it up. Then I did another pinch test, this time engine dies in about 5 seconds.

My question is, this whole time I have been playing with the LSN first. Should I tune the HSN first and then play with the idle and LSN? PureNitro's guide to tuning.

 

[SavagePower]

Maybe HSN is causing my problem?

 

[Bankrupter]

If your hsn is fat and you are tuning the lsn you could be tuning to a loaded up mill. I tune my HSN first. Some say it don't matter. I just find it much easier to tune the mill this way.