I have one of the original EB Mod engines that was pre broke in before I received it. It is not the full mod engine. I've ran about 2 gallons through the engine and have had great luck so far. This past weekend the motor started giving me problems. Through the first 2 minutes of a run everything is fine. After the engine heats up I have no bottom end power. I was all over place with my tune searching for the problem and nothing seems to help. I changed the glow plug and set the motor back to stock settings. I retuned from there with still no luck. I changed the fuel tank and put new gaskets on my pipe. I also checked all my fuel lines but the problem is still there. Any help would greatly be appreciated.

Check the rubber boot on your carb slide. Mine leaked there causing me fits chasing the tune around.

first gen extech
 

anyone with the first gen extech for sale with lil run oit let me know looking to buy a back up. pm me money in hand right now

Check your exhaust gaskets.

You may need to richen the bottom 2 hours and lean the top 1.

chad ygpm

leaky carb boot
 

I'm having trouble w/ moisture around my carb boot. I looks like it's spraying out by the fuel on the rear brake and chassis brace. Its not much, but enough to cause brake problems and possible tuning issues. how do you seal the carb boot. I have some lucky 7, but haven't been able to get the boot to seal properly. Is there a replacment boot I can buy? I replaced the LSN o-ring and still have the same problem.

Just take it off and clean it all up real good. That should do it. Also check closely for pin holes. I had a throttle return spring poke a hole in mine. I tried a little rtv to seal the boot but I don't think it helped much as it needs to flex and just breaks loose. Just get it real clean.

leak boot
 

yeah, that's what happened to mine. throttle return spring poked it. what boot did you replace it with? i'll clean it up and see what happens, but I'm not sure if the lucky7 will hold on the pin hole.

how dose the first extech 21 run i have the 2 and its got crazy power top to bottom i run the 086 on it and it runs balls out or are theay the same

carb problem
 

I've been looking all through this thread for this picture. I knew I had seen a pic of it. I have the same flat spot on my carb in the exact same place. I would like to get this fixed since I have a pro series race coming up and have been trying everything to seal this boot. Now i see why it wouldn't seal. I would like to know if this is something that can be fixed quickly.

Lucky 7 will work...get things clean before applying,

The engines run the same...the Fat Boy Trinity pipe smooths it out and adds run time.

ex tech shim
 

I bought an ex tech from a guy and took it apart to look it over and found that there are 4 shims on the button it that normally what they have on them to run 30%?

nwjones.. which motor? RP or Fm / .21 or .24?

Ex tech Shimming
 

Chad,

The motor is a .21 full modded version.

Chad,

How long til A-main has .24 pre runs again. I am ready to buy a back up for my first. Got 3 gallons on it now and it runs great. Pull off after a 20 min main and idles perfect @ about 210 degrees!