So I've gotten a gallon of fuel through this truck and I thought all was well then it started. I took it out one day mind you it was a much cooler day and it was really sluggish and running really rich. I thought this was strange since the day before all was well. So I began playing around trying to lean it out. All the time noticing how difficult it's been getting to start this thing, especially the second time around. So I also notice it's been stalling allot more and getting to the point where starting it is getting to be a pain. At one point it staled and when I tried to turn it over it was locked up, so I pulled out the glow plug and turned the fly wheel by hand and it came loose. I put it away for almost a week since I've been busy with work. Today I tried taking it out and it started almost off the bat then of course stalled, I was able to stat it up again with it then stalling for the second time but this time when I tried to turn it over it was locked again. So I removed the glow plug again and turned it over by hand but I was unable to get it to fire up again after spending about an hour with it. I don't get it since it did start but then stalled. I check almost everything, clutch springs adjusted the needles, even the idle, glow plugs, igniter etc... I'm getting really pissed since I've put allot of time and money into this truck and if it's not one thing it's another. Does anyone have any similar experiences? any advise is welcomed.

It may sound stupid but are you sure you're turning the needles the right direction to lean it out?

It just sounds like it's very very rich, too rich to run actually. This would explain why it started on almost the first pull, because it didn't have much fuel in the engine yet. Then it stalled as more fuel came in and eventually flooded making it impossible to turn over. You did the right thing by removing the glow plug to clear out any fuel in the combustion chamber.

My advice would be first to set both needles back to the factory position. This will still be rich but it's a starting point and at least then we know in which direction we are going with this. Once you get that done, try to fire it up. Then proceed to lean it out until it's performing well by turning the high speed needle clockwise a 1/8th of a turn at a time or less. Do the same with the low speed needle, you'll notice the effect of this needle off the line in acceleration. Everything else is the high speed needle.

If you have a temp gauge that's great. If not you can get by with the water drop test, and in both cases watch for the trail of thick blue smoke telling you the engine is getting the proper fuel/oil content. If at any time you don't see this smoke trail or hear the RPM's get very high and the engine makes a screaming sound, turn it off as it's too lean. I suspect this is the problem though, it's just very rich.

I am having that same problem. When I first got my truck, it would sit there and idle for 10-15 minutes. After about half a gallon, I cannot start the engine unless I give it some gas while cranking it. Once cranked though, it will idle for at least 5-10 seconds until it cuts off. I tried to start it yesterday and my stupid roto start battery died because it took so long to crank it.

I guess I'll start at the factory settings and see what happens.

Well guys as always it's good to get some advise as for the proper way to turn the needles I have been doing that the right way. It just seemed odd to me that the dialing in process was going rather well and almost overnight it was way too rich and locking up, it had not been so a day ago. Okay I'm no poet but I suppose I've read a few to many threads talking about metal shavings in the engine. One other thing I'm running MC8's with 20% nitro is this a hot enough plug? Also how do you know if you have a fowled carb or plug?

i use the 59's. always have. i used the 8's on my old small block. not sure how they work on the mach. i does sound like a flood issue. something weird is goin on here. i really cant help you as all of my probs in the past have been a lack of fuel.

i started having problems with mine after 6-8 tanks. it would run for a while then shut off and when i did the spit test it would sizzle right off the cooling head. I ASSUME it was the cheasy primer leaking pressure from the exhaust since the nipple on the exhaust is free and clear. as i read sometimes the primer will bleed off pressure created by the exhuast and cause the truck to run lean. this was all with the needles set at HSN 3.5 and LSN 2 so I imagine for the truck to get that hot it had to be getting lean.

I've since removed the primer and will just blow into the exhaust tube to prime. I havent had a chance to run the truck since when i traveled to my running ground the dang kwik start glow plug igniter was dead!

I hope this was my problem and it will be fixed! (primer shouldnt even come on the truck!)

Interesting... I am wondering now if I have a leaky primer... I ran my truck 2 tanks the other day, and it was fine - running rich for break in.
Now on my third tank today the truck was running much different! As if it had been leaned up, even idling very high...

The primer acted funny when I started it, sticking down a couple times and I had to actually pull it back up... So maybe it is dirty...

I think I will do the same and take it out, better than dealing with issues with it...
What are people doing to seal it?

i ripped it off andtook out the innards. then jammed the primer cap right back in the hole. little marine goop and its been fine for a gallon now.

I wouldn't run MC8's. Stock Mach .26's like hot plugs like the MC59. MC8's (medium temp plug) for 30% nitro.

Your glow plug all depends on the tempeture outside. In arizona the weather has rapid changes in tempeture. In the morning it will be like 65 degrees and in the after noon it can be 90 degrees.
And has a major effects on a nitro engines performance.

that'll be your little secret. engines like different plugs for different fuels. like what lstdude said. i have ran my engines in everything from 20 degrees to 100 here in maine. the same plug is used for everything. there aint a person up here that swaps plugs depending on the temp outside. we tune the truck for that.

O-ring and a sheetmetal screw, Then I used the mgt primer bulb works awesome.