Hi all,

I just purchased a Fox 40BB off Ebay. What a mistake! The seller said it ran fine the last time he had it, But I can not get it to run. Not even a cough! One of the first things I noticed is that there is Epoxy around the Carb to crankcase connection. It also appears the low speed screw is turned out rather far. the carb has 2 needle valves and a third screw on the top of the carb. When priming the engine before the initial start, I noticed it would draw fuel up the fuel line, then actually push it away again as you completed the cycle of the engine. I also threw the electric starter to it and could see droplets of fuel coming out the carb opening. Can anyone tell me what needle valve settings I could start with, or any other suggestions on what I can do to get this thing running would be appreciated.

I think 1st of all, many of the fox motors were designed to run on high nitro. I had a couple of Eagle 60 that required 25%. Probably the 3rd screw is for the barrel adjustment. Start with the HS needle about 2 turns and the low speed about the same for starters. Make sure the spray bar is not plugged up. See if you can blow fuel through the needle valve opening with the needlevalve removed and putting your finger over the fuel inlet coming from the fuel tank. You should see a spray coming for the spray bar when you do this. If not then it is plugged up. Hope this might help.

If this is the fox carb that has ears to mount to the engine, the epoxy is probably there to stop air leaks. I would take off the carb, disassemble and clean it real good. Run a piece of fine wire through the spray bar to clean any debris out. Reassemble the carb, and mount it with some RTV gasket sealant. Be sure to clean the carb ears and crankcase with alcohol to remove any oil. Set the needles at two turns out each, prime the engine and give it a try. Good Luck!

Looks like some one got to you[:@] take the engine apart and check and see if they put the sleeve in wrong. If the sleeve is miss aligned it will spit fuel out the carb. And they love Nitro and Castor, Duke set them up for mistle mist which was 25%.

That "epoxy" around the carburator is more likely a silicon-based automotive sealant. Lots of folks use such compounds to create air-tight carburetor connections.

Once you get it running, I doubt you'll be sorry you bought it. Fox sport engines are supposed to be terrific performers.

I have one of these that I bought in 1992 and its the strongest rc motor that Ive ever seen. I would turn the lowspeed neeedle al the way in GENTLY NOT TO TIGHT then back it out about 2 turns. Then do the same to the high speed and back it out about 3 turns. Make sure you have a good glow plug a standars RC long is what they use. Check the muffler pressure outlet for obstructions and also make sure that none of the tiny little screws are missing from where the 2 peice muffler is joined. Air will escape from that if its missing. The "epoxy is for sealing the carb to the crankcase. This engine has a little square tube on the bottom of the carb that slips into the crankcase and its held in by a set screw on the side. The extra screw on top is a bleed air system that they added to the new carbs. Mine does not have this but remember that it works opposite of the needle I.E counterclockwise=leaner and clockwise=richer. I would turn it all the way in and then back it out about halfway.
Once it starts you can adjust from there. If you need more help call FOX they are very friendly and are lots of help.
Hope this helps

Go here:

[link=http://web.archive.org/web/20050206202822/www.flitelinesolutions.com/]Archived Fox Motor Information[/link]

This is an old site with lots of information on making Fox engines run. You may find what you're looking for there.

Live long, and prosper
Jerry L. Gubka