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Old 01-19-2012, 10:36 PM
recon chris's Avatar
recon chris recon chris is offline
Motorized Bicycle Senior Member
Join Date: Apr 2011
Location: pacific grove
Posts: 87
Default Re: Getting all 3 Horse Power out of your GT-5 Sky? (tear down)

Some things I did today:

Polished the head (I had already tried it about 200 miles ago, so that is why the before shot doesn’t look so bad.)


Opened up the transfer ports about 100%

Before sanding with material already removed
After light sanding

Corrected an odd casting defect that was left over from the factory. Im guessing every grumbie has this. It has to hamper performance by a good percentage if left uncorrected. I had to pull a Houdini to get a dermal bit in there without scratch the walls of the jug.


Cleaned the carb up. Left the air filter off because I will be upgrading to a SBP low profile air filter (a million times cleaner and more efficient than stock sponge)


And got a new Piston today (old one had one of its position pins vibrate loose, I stoped it before it killed the jug)
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Last edited by recon chris; 01-20-2012 at 12:03 AM.
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