Gx390 build almost done

[gman3850]

Gx390
New stock piston
Arc rod
Head milled .05
.02 head gasket
35lb springs
Torque cam 246 .260 lift
Chromoly push rods
1.3 rockers
Powder coated tins
Diykarts sticker
Clone Electric start flywheel (probly gonna buy a arc to be safe)
K&n filter
Unfinished exhaust ( going to have pit bike muffler )

 

[gman3850]

Nice tight fit

 

[bob58o]

Ummmm, where are the first 30 pages???

 

[Poboy kartman]

GAB....the crib notes edition!

 

[chancer]

GAB....the crib notes edition!

Now that is Funny

 

[bob58o]

What's with the delay?
What happened to the old stock piston?


Coincidental? lol

 

[gman3850]

Just put q new piston and rings when I was in it. And delay was because I just never had anything to put it on but now gonna put it on the dingo

 

[gman3850]

Well it doesn't do wheelies because I'm running a 5.4 ratio but got the 9t on the way.

Hit 54mph at around 6k rpm and it was a bit nerve racking.

 

[chancer]

Cool. Gear it 7:1 see if it will stand on that Roll Bar! almost as nerve racking as 54MPH

 

[bob58o]

Well it doesn't do wheelies because I'm running a 5.4 ratio but got the 9t on the way.

Hit 54mph at around 6k rpm and it was a bit nerve racking.

That is what I'm talking about!
Scary fast!

 

[KartFab]

I put an 8t on mine with a stock gx390 and it wheelies with my 230 lb self on it. Set the idle higher and it helps with the torque on start. If the idle is low, it may bog for a second before the engine revs up.

 

[gman3850]

I put an 8t on mine with a stock gx390 and it wheelies with my 230 lb self on it. Set the idle higher and it helps with the torque on start. If the idle is low, it may bog for a second before the engine revs up.

did u stock spring in the driver. Idle is low and any higher it wants to engage

 

[Mikegtrxu1]

About to rebuild one of these myself (vert shaft version). Cool little motors they are, pretty refined considering they are for industrial/agricultural use.

Yours came out great