I have a lst i have a prob with it running rich then lean on the same run i won a 45 min main with it making pit stops every 5 mins at 200 degrees it was flawless so i decided to put the bigger tank on it after that i burned the motor up so i bought a new motor put the stock tank back on it and still the same rich lean prob broke another motor rebuilt it took the filter off too no avail put new fuel lines on it didnt help im an experienced rc'r with over 25 years exp.the last 2 in gas when i rebuilt the last motor i sealed it with silicone still didnt help im at a loss the motor is the stock mach 26 have any of you had this prob seems like an air leak but cant find it ive made sure the cap is sealed when i fuel it any help or comments would be appreciated thnx MW

I've heard of similar problems with the savage (although I haven't experienced it yet). The solutions I've seen involve raising or lowering the tank so that the pull of gas is the same throughout the tank. Otherwise, the gas level is higher for the first half (runs richer because it doesn't have to pull as hard for the gas) and lower for the second half, resulting in the motor leaning out. Another option I've seen is to mount a secondary tank higher than the intake so that the fuel flow remains consistent throughout the run. I'll see if I can find some pics and post them, but you might also look over on savagecentral.
Hope this helps,
Brian

Have you checked for a air leak in the tank primer? Primers have always been known as problems from what I hear.

I took the primer out and sealed the hole thnx MW

I think I found the problem I flooded the engine accidently and when i turned it over fuel came out the front bearing. Musta ruined the seal when i got it hot.
thnx for every ones help MW