i lent out my 86 pipe damn. ill start looking for a 53, id imagine my 2013 would be too much on the bottom and the truck would run out of lung on the straights.
new motors are always fun

Wondering if someone can tell me what my problem might be....

Engine is a P5XLT with 2 gallons of 20% on it. HSN is just barely out from flush, LSN is out 2 turns from fully IN.

After it gets up to temp and heat-soaked (approx 230 degrees).....

It runs fine but I get a pretty long 2-stage idle and when it drops down it wants to stall, so I have to kinda keep it running. By blipping the throttle though, it seems to idle up, then down, and generally erraticly. When the engine is colder (180 degrees approx) it runs fine and seems to idle better.

I have been all over the place with the LSN and idle screw and can't seem to get this to stop. It likes to load up at idle too so it smokes quite a bit if you let it sit for 10+ seconds, then take off, yet if I start to lean the LSN it will 2-stroke when I'm on the track....particularly after going wide open down the straight.

Any ideas from what I have described?

This could be several different things but lets start at the basics. How long have you been using the same glow plug and how much fuel have you burned through it? May need to change your plug. The settings you described on your needles are backwards. You should start with your LSN at flush and your HSN about 4 turns out. You need to set your idle screw at 1mm gap AND NEVER TOUCH IT AGAIN. This is a big mistake most people make when their tune gets outta whack and they think its an idle issue when its actually improper needle settings. Once idle is set you should never have to mess with it again. Always set your HSN first and then your LSN. If your idle hangs after a WOT run then your too lean on the HSN. If the idle comes down then goes back up its too lean on the LSN. With your needles set backwards the LSN is way too lean and the HSN is way too rich and is trying to compensate for the improper LSN setting. Also, what you're describing can be an air leak. Have you sealed the engine back plate and carb base? And check your fuel tank cap seal. If its not sealing properly you will get an erratic tune that cant be fixed without solving the air leak problem. Check all your lines and fuel tank.

More info would help... like which glow plug, type of fuel/oil... tuning issues can be caused by a lot of things but if your lsn is leaned out that far and still loading up it leads me to believe something is out of whack.

1 mm idle gap is way too big....and really the idle gap is something that does change as the air density changes... the idle gap is often one of the first needles I tweak as the climate changes....pretty much the worst thing someone could do is set a 1 mm gap and leave it there, make the engine pretty much untuneable as it would have a non stop high idle ....

3 points:
- lsn slightly rich
- new plug, c6
- idle gap too big

I am using an OD 277t 'hot' plug. I've tried changing it already...no luck. I'm using blue thunder 20% nitro fuel. I should also add...I've taken 1 of the thin copper shims out from under the head. This was recommended to me by a well known pro to do when using lower nitro like I am.

I see some of you say my LSN is lean, I agree, but then 1 guy says its rich????? I love forums!

Try this out, richen hsn 1 turn from flush, lsn 1 turn in, 24069 right, idle .7mm max. Start leaning lsn to have steady idle, if it is too lean, the temp wont go down during idle or few laps. Once you get it, lean hsn to get clean wot.

Hard to describe by words, but I'm sure someone at track would help.

Guess ur idle gap is too big, rich lsn with lean hsn

7.5mins to 8mins is what i get running rex paloma, this is normal, if the mod can give extra 30 seconds then it would be nice

go back to factory settings and the idle gap at half a mm and lean from there. also put away the temp gun unless your just doing at the end of a run
you want to set your tune so you get a consistant idle, with most peoples massive idle gaps once they find the consistant idle they think its too lean as the engine wants to take off but they just need to lower the idle and go on with the fine tuning.
all the nitro guys at my track had this issue a month ago, too big of idle gaps lean ass lsn and super rich up top, tuning with a damn temp gun cause its getting over 230 degrees.

just to check is there any binding on your carb when its closed,two turns from fully closed on the lsn would put the needle really far into the spray nozzle and may damage the nozzle seat or your lsn. this is why your told to open the carb anytime you bottom out the lsn trying to return it to factory settings.

Pretty good vid explaining how to tune the idle and lsn on a nova

https://vimeo.com/7595905

I had rex paloma 7 port, will the 3ports n 5ports sleeve fit into the crankcase?

Novarossi P5XLT is the same engine Ultimate M5?


PJ

Mostly yes. P5XLT has 15009 crankshaft, M5 has 15009T like what the Clio P5 has.

Hey guys quik q, how does my idle gap look? a little wide? just right?