Gt80 junk?

1max

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Jul 11, 2014
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Just got gt80 a month ago nothing but problems right now I just replaced cylinder head and piston got rid of low compression head it had a ported cylinder I got a stock one kept reed and keihin carb . My o original head and piston are fried . This one is starting to do the same . Now the carb is leaking . The engine is smoking hot after about 2mins. Of running. Is a non ported cylinder an issue ? I'm t replacing the carb with a stock carb will that help ? It's getting way to much air.
 
Oh boy...
So, I have run these 66cc and 48cc motors for hundreds of kms with no great problems since last summer.
I started with a well worn stock 66cc motor I bought used. Repaired all the bad things as I found them.
This is a mechanical maintenance principle know as "return to as designed state".
It had many things wrong, but one by one, I repaired them and got a reliable bicycle.
I took gradually longer trips with it, repairing anything wrong in the inspections when I returned.
By then I had learned enough to make some mods, one by one, to see if they worked or not.

So here is my seasoned advice to you. Return it to stock, as best you can. Repair what is wrong.
Learn mechanical skills, using the right tools, torquing bolts properly, fitting gaskets, etc.
Learn to read the plug. Look up "plug chop" so you can learn to jet.

Steve
 
ruining pistons can be due to 4 things:
1. not using a good foam air filter that is well oiled
2. having an air leak between carb and cylinder or at the crank seals
3. having a bad seal at the head/cylinder junction. you need to plane the head surface flat using sandpaper on glass and make your own fiber gasket
4. not using the correct oil/gas ratio. for standard mineral oil mix at 20:1, for semi-synthetic mix at 25:1, for full synthetic mix at 30:1
 
I've done everything you said yes but I have my own feul mixture un 32 to 1 93 octane. I use Liquid copper Gasket maker on the intake manifold for carburetor. As well as the exhaust
 
Thanks guys I'll try out some of these things jaguar and thank you Steve I am going back to basics on this I do believe it was probably an air leak at my keihin carburetor where the fuel went in but it could be something else so I'm going to go over to the things the Jaguar put in and see if I can resolve this issue I'm going back to just a speed car and see how that works
 
also using a soft material between the cases and the frame allows the engine to vibrate too much which can froth the gasoline in the float bowl which can cause the fuel/air mixture to be lean and cause engine over-heating
 
also using a soft material between the cases and the frame allows the
engine to vibrate too much which can froth the gasoline in the float bowl which can cause the fuel/air mixture to be lean and cause engine over-heating

I have been considering putting on am expansion cahmber,from BikeBerry.
NO MUFFLER NO SILENCER. My only concerned is,,,,,,,,,no silencer/Muffler, now this because it's high performance. O d
DO-NOT!!!!!WANT SOMETHING SPITTING OIL ON ME OR MY FRAME/MAGS! .......DOES AMYONE HAVE ANY EXPERIENCE with these.l?
 
Has anyone used thes do the rims or tires on the path that you're writing on the ground to making The roads slick as it spits out its exhaust onto the blacktop or concrete whatever you may be traveling on that is my concern where does the exhaust go to which direction does it spit out? I don't want to be having to clean my room at all the time again. Or clean the bottom of my frame in the Kranks and messing up my gym shoes. Because if I ask Mike Berry we order it from They are going to say( OH NO IT'LL BE JUST FINE)
Then I will be stuck cleaning my cranks and idles sprockets and shoes. Being all f***ed up again I just solved that problem and don't want to go back to it.

Thank you sincerely
WINDY CITY BOB
 
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