i have a thunder tiger 46 in my kadet. i seem to be having a problem when it is at idle speed. it will run for around 10 seconds then die off. i have to use my radio to increase the sub trim in order to keep it running. know the problem is when im landing i have to decrease the trim to slow the motor down enough to land and am taking a chance of the motor quiting on me.now this motor isnt the same as my other OS motor which has a low end needle vavle which is used when the engine is at idle. i looked my motor and cannot find any thing to adjust. i did notice a bolt on the back of the carb facing the block but that is a tight space for an adjuster. so if any one can help me that would be great.

Most likely the low end mixture is a tad lean. Check the manual on the engine and increase the low end mixture a bit. Usually, there is a small screw adjustment, sometimes inside the idle bar on the opposite side of the throttle, and when you make the adjustments, do it in very small increments, like 1/8 turns. Remember, righty-tighty, lefty-loosey. So, turn it out or counter-cloickwise in 1/8 turns to richen it up a bit.

CGr.

If it's a TT PRO 46, the low speed adjustment is on the end of the throttle shaft, opposite the high speed needle. You will need a very small screwdriver to access it.

Jack

There ya go. Someone with experience with that engine. I was generalizing but the concept is basically the same.

Photo of my TT 46 Pro in my Kadet LT-40. Besides the idle adjustment, other critical factors affecting a reliable idle would be plug (OS-#8 will work nicely but the OS-A3 is a bit cheaper) and fuel (a 15% nitro content seems to be the happy point).

At low idle pinch the fuel line. If it just fades and dies you are lean - turn the low/idle idle screw counterclockwise 1/8 turn. If after about four seconds it speeds up before dying you are adjusted well for most conditions. If after longer than four seconds it speeds up before dying you are rich - turn the low/idle screw in 1/8 turn clockwise. (The one on the opposite side of the throttle arm).

Take it to half-throttle for a few second and idle down each time between tests to get a good fuel flow going.

High end is different - that's the larger needle-valve.

I run a TT Pro-46 and it is a splendid engine. Mine accumulated enough dirt knaps that the needle arm housing was damaged and allowed air to leak in. It was impossible to tune for a good idle (or mid-range transition for that matter). I replaced the stock carb with a Perry carb and it is still going strong.