khalif
RC Newbie
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Thunder tiger 12BX
I have just gotten hold of a S/H replacement engine for the old Kyosho GS11 It is a Thunder tiger 12BX Pro, I managed to shoe horn it into the car (Buggy) without any probs. It was in clean condition and came as a spare with another car. It started Ok but was very erratic and would not idle at all and would suddenly rev very high. I removed it from the car and stripped the carb which had a fair few bits of crud in it, cleaned it all and refitted it, but it was impossible to adjust the idle needle in the car (for physical reasons could not get to the screw). I removed the motor and rigged it up on the bench. I was able to set the Idle quite well and the motor responds quite well to the throttle but every so often it goes crazy and the revs go sky high even though the throttle is barely open (0.5mm). If I pinch the fuel line when it does this, the motor slows (and stops if I keep it pinched), release it and it goes sky high again. I have tried it with the carb completely closed (0mm) when it goes doodle alley but it is the same. I have also tried sucking the fuel line with the carb slide closed and it does not leak. The tank and exhaust do not leak. The backplate is sealed and the motor sucks in fuel with the carb open and venturi blocked with a finger. I have had quite a few aircraft and heli motors and they were all easy to set up but this is a real crock. I took the carb off a brand new (30mins running) Magnum 25 and fitted it, It works OK. Fairly stable just doesn't go crazy like before and is quite useable but just a bit lacking in max revs. Just to try, I took the Tiger carb and put it on the Magnum works fine and the idle is superbly slow with a 9x6 prop. No gitches or weird behaviour at any revs.
Makes no sense..............Any ideas anyone?
I have just gotten hold of a S/H replacement engine for the old Kyosho GS11 It is a Thunder tiger 12BX Pro, I managed to shoe horn it into the car (Buggy) without any probs. It was in clean condition and came as a spare with another car. It started Ok but was very erratic and would not idle at all and would suddenly rev very high. I removed it from the car and stripped the carb which had a fair few bits of crud in it, cleaned it all and refitted it, but it was impossible to adjust the idle needle in the car (for physical reasons could not get to the screw). I removed the motor and rigged it up on the bench. I was able to set the Idle quite well and the motor responds quite well to the throttle but every so often it goes crazy and the revs go sky high even though the throttle is barely open (0.5mm). If I pinch the fuel line when it does this, the motor slows (and stops if I keep it pinched), release it and it goes sky high again. I have tried it with the carb completely closed (0mm) when it goes doodle alley but it is the same. I have also tried sucking the fuel line with the carb slide closed and it does not leak. The tank and exhaust do not leak. The backplate is sealed and the motor sucks in fuel with the carb open and venturi blocked with a finger. I have had quite a few aircraft and heli motors and they were all easy to set up but this is a real crock. I took the carb off a brand new (30mins running) Magnum 25 and fitted it, It works OK. Fairly stable just doesn't go crazy like before and is quite useable but just a bit lacking in max revs. Just to try, I took the Tiger carb and put it on the Magnum works fine and the idle is superbly slow with a 9x6 prop. No gitches or weird behaviour at any revs.
Makes no sense..............Any ideas anyone?
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