wahts the factory needle setting for the low speed

"Tuned setings" are HSN flush and LSN flush + 1/2 turn in. This assumes you're using the 8mm restrictor that comes with it and 30% Trinity Platinum fuel.

I have been trying to help my brother tune his extech .21 we just could not get it to stay running no matter what we did we sealed the engine replaced the fuel tank checked the fuel lines and changed the glow plugs nothing worked so today we broke down the engine and we find a bunch of silicone in it looks like it came out of the crank. I have a couple of questions first will the engine run ok with out the crank being filled second do you think there is any damage to the engine I checked it and I dont see any. has anyone had this problem. thanks for any help

Unfortunately, I have heard several stories of this happening. Don't know why this can't be fixed. Personally, I have had it happen with two mills now. One I ran last season, and an FM 09 I ran this season, just happened last w/end. While it does seem to be an ongoing problem, I have heard a few guys have run without the putty. I am going to try it out soon myself. You can also contact Chad @ Trinity, and I'm sure he will work something out to get yours fixed.

I going to tear down mine tomorrow and take a look I was going to pick up a 24 but I think I might hold off . I don't think this problem will damage the engine but it would suck if it happened in the middle of a race. My brother bought his engine about 6 months ago he only has 2 gallons on it but I don't think chad will be able to do anything about it.Thanks for the info

I could not get mine to run right until I swapped out carbs to a nova unit...it runs flawlessly now

same thing happened to my ExTech .21 FM , had it redone by a friend of mine who mods engines , told me you can run without the silicone , but you probably wouldn`t get as good of fuel mileage , engine runs awesome since he fixed it.......

Does anyone know what causes this to happen we use good fuel byrons 25% race but we don't use after run oil I wonder if that can be the problem

I have read that most guys aren't running afterrun oil in these motors because of that exact problem. Oh a got a half gallon through my .24 FM and its gonna be a beast !!! Can't wait to get it fully tuned!!!

I used ARO on my mill from last season. Did not use any on the mill from this season...I'm at a loss. Still love the engine though, and will be running one for RCP Finals.

Ok I can't figure this out I put this thing back together but a new glow plug in it ran great for a couple a minutes then just died now as soon as I take the ignitor off it dies I have sealed the carb and the rear cover, pressure tested the fuel tank and changed the fuel lines I don't know what else to try does anyone have any ideas on what I might be doing wrong

make sure you got all the pieces of silicone out , only takes 1 little piece on the glow plug to foul it out that it will only fire with the igniter on, try a new plug and hope you have good luck

thanks I will take it apart again and make sure

I am going to try a OS V-spec carb on the Extech .21, Just wondering if anyone else has tried this, to give me a head start on HSN and LSN settings.

mine to lost the putty out of it still wont run with out glow starter on it this sucks