Super Tigre G90 won't idle.
#1
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Super Tigre G90 won't idle.
Bax,
I read your sticky on how to adjust ST engine. I have done all that but the engine won't idle.It is a G90 and runs just fine except when I throttle back the engine dies abruptly when it approaches idle speed. It acts like the carb barrel has been suddenly closed although there is still about an 1/8" opening in the throat.
Any suggestions?
Regards,
doubledee
I have also noticed when I try to adjust the low speed needle the throttle assy moves laterally slightly causing the engine to die abruptly.
I read your sticky on how to adjust ST engine. I have done all that but the engine won't idle.It is a G90 and runs just fine except when I throttle back the engine dies abruptly when it approaches idle speed. It acts like the carb barrel has been suddenly closed although there is still about an 1/8" opening in the throat.
Any suggestions?
Regards,
doubledee
I have also noticed when I try to adjust the low speed needle the throttle assy moves laterally slightly causing the engine to die abruptly.
#3
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RE: Super Tigre G90 won't idle.
It's normal for the carb barrel to move a bit when you try to adjust the idle mixture. However, the engine should still run when the throttle is still opened about 1/8". You need to make sure the engine has the idle mixture set wildly rich. That is, too rich to have any hope of idling. Then you must start at part-throttle and get the full-throttle mixture set. If the engine's broken-in enough, you should then be able to retard the throttle a bit at a time and work with the idle mixture. It will start to have effect below 1/2-throttle or so.
After all this, if your engine has more than a few hours' worth of full-throttle running, and will hold a top-end needle setting quite well, then there could be a problem with the carburetor. However, don't discount the fuel. We'd recommend a fuel with about 10% nitro or so with a synthetic/castor blend in the oil mix. Some blends of fuel, or fuels that have been sitting around and not well sealed, can cause difficulties.
After all this, if your engine has more than a few hours' worth of full-throttle running, and will hold a top-end needle setting quite well, then there could be a problem with the carburetor. However, don't discount the fuel. We'd recommend a fuel with about 10% nitro or so with a synthetic/castor blend in the oil mix. Some blends of fuel, or fuels that have been sitting around and not well sealed, can cause difficulties.