GT90 Carburetor Help

M

Member 28982

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Yeah... I'm going to install it next weekend. Ordered a 36 tooth rear sprocket. A banana style expansion chamber and a 3 prong high performance spark plug.
Here a few pics. Removing 49cc and installing this beast 66cc...
 

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inspectorcritic

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Joined
Dec 13, 2015
Messages
1,176
I had a GT90 wasn't as tuff as advertise I learn never buy a racing motor. It's ported it's gonna blow a jug looks like thumb imprint maybe to prevent that is to drop your stock exhaust get one with more expansion.
The carb I like except you need a reed it blows back into the air filter clogs it power speed drops off rapidly your to wash it in clean gas every time you mix a 2 stroke gallon. So I just said f*** it took the reed off took the filter off runs just fine.
Next thing happen the motor just putter right out went over every day for a month junk the motor bought a stock made me happy again.
What I use for the drain tube small vacuumed line I think 3/16" the carb I like because you don't half to choke every time you get on it until the temperature is in the teens and if walk it flood it for 60 seconds 1 or 2 minutes before start it you can still bypass the choke.
 

Frogslayer

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Joined
Jan 20, 2019
Messages
768
I had a GT90 wasn't as tuff as advertise I learn never buy a racing motor. It's ported it's gonna blow a jug looks like thumb imprint maybe to prevent that is to drop your stock exhaust get one with more expansion.
The carb I like except you need a reed it blows back into the air filter clogs it power speed drops off rapidly your to wash it in clean gas every time you mix a 2 stroke gallon. So I just said f*** it took the reed off took the filter off runs just fine.
Next thing happen the motor just putter right out went over every day for a month junk the motor bought a stock made me happy again.
What I use for the drain tube small vacuumed line I think 3/16" the carb I like because you don't half to choke every time you get on it until the temperature is in the teens and if walk it flood it for 60 seconds 1 or 2 minutes before start it you can still bypass the choke.
Your describing a rich condition, you know that right. Run smoother and last longer with better milage and more power if you just jet it right. Just saying...
 

Frogslayer

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Joined
Jan 20, 2019
Messages
768
You should have to use the choke cold (our biosphere temp) for at least a couple pops if it's jetted close to optimal for run temps. The difference between 45 degrees and 80 degrees is nothing compared to 85 degrees to 700 degrees
 

CrazyDan

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Joined
Jul 9, 2016
Messages
2,382
Just check what ever tree you hid your .66 jet in and I got a feeling you be great.
Warn people before you try to give them a heart attack, I nearly died laughing. For those that don't get it, inspector hides spare parts in trees and bushes around town.
 
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