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 Post subject: Roketa gy6 vacuum and fuel line problem
PostPosted: Fri Dec 30, 2011 12:08 pm 
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Hello, I ran into this forum and was amazed by the expertise! So I decided to give it a spin. My issue is with my Roketa 150cc gy6 dune buggy. It use to start on the first crank, however now you'll have to let it crank until the battery is nearly dead, then it will run - but will die randomly.

The history of the gokart: The original owner was not mechanically inclined at all, managed to blow the original motor - replaced it with a 150cc and added some items to bump it to 200cc. Once I purchased it from him, I replaced the starter, solenoid, and ignition coil.

However I am certain that the vacuum lines are incorrectly connected - I was curious if anyone knew where the vacuum lines go? I have 2 T's that he intertwined and the fuel goes straight from the top petcock to the middle of the carb.

Also, my Fuel Diaphragm is leaking, Where should I go about purchasing one?

I can upload pictures if you'd like.

~Mark


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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Fri Dec 30, 2011 12:33 pm 
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pictures would help figure out where your problem is.

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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Fri Dec 30, 2011 12:37 pm 
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Hi Mark,

One of the more common reasons for a buggy to be difficult to start (assuming all other things are hooked up correctly...) is your valve adjustments.

Take a look at the tutorial here and give that a try. Worst case scenario: your valve settings are correctly verified and you're still in the same boat.

It's been known to clear up the hard-starting issue so give it a try! :)

-Mike

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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Fri Dec 30, 2011 1:03 pm 
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2 T's for a vacuum petcock something don't sound wright.
yep you need to replace it, if its leaking. if you hook it up you will dump gas into your engine through vacuum line going into intake flooding it out or draining tank into engine
i would get the manual shut off style petcock. than all you need is vacuum line from passenger side of carb to nipple sticking out on drivers side of intake.than turn your gas on and off when not running

yep show us some pictures and also adjust the valves.

board index dealers review fame/shame you will find a list of the dealers here

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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Fri Dec 30, 2011 10:12 pm 
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Unless you have a pumper carb....I think your vacumn diaphram is leaking (because it is hooked to the fuel side)
The vacumn line from the top of the carb (diaphram) runs to the manifold. The only T should on this line. From that T a line will run to the vacumn petcock. (If I remember right it was the bottom conection on the petcock) The fuel line should run directly to the gas bowl on the carb. (no T)
The petcock operation can be verified by connecting a vacumn source to the bottom and seeing if gas flows with vacumn supplied. ( I'm sure it's the bottom and is a smaller line... but try both if they are the same size) If gas doesn't flow with vacumn supplied... blow back through the gas side of the valve.. If that clears it add some carb cleaner to the gas.
Valve ajustment will clear most hard start problems but may not help much if lines are not correct
If it turns out your carb diaphram is leaking you may want to consider a new carb...diaphram are about $15-20 chokes about $15 if diaphram is bad.. how long until everything needs to be replaced. (Carbs $30 or less)
Welcome to the forumn- Pat

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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Fri Dec 30, 2011 10:38 pm 
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i reread that must have not read it wright the first time :)
does sound as the vacuum line for petcock is hook to supply gas to carb. i could see that if diagfram is bad in petcock it will let gas through that end.
just don't understand 2 T's

hopefully he will show us some pictures

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2006 sunl 150b
12 gram sliders,prodigy variator, red torque spring,39 tooth sprocket,2000lb winch, red neck uni filter with K&N precharger, 125 main jet at 1,634 elevation, drilled out exhaust,ngk iridium plug,performance intake,
ncy orange cdi


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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Sat Dec 31, 2011 1:31 am 
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Joined: Fri Dec 30, 2011 11:58 am
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I noticed after investigating my fuel petcock situation that the gokart has a 50cc fuel diaphragm - so I went ahead and purchased a new 50cc and a 150cc fuel diaphragm from a scooter website. Only thing different is the 150cc diaphragm has 3 ports? Just curious which one would be a better fit, and I will upload pictures tomorrow - had to repair my buddy's brake line on his truck, left him stranded.. stupid dodges!

Thank you for all the responses! Hope I can get this baby going strong! and I'll adjust the valves as well, great tutorial!


Last edited by RoketaDune150 on Mon Jan 02, 2012 1:44 pm, edited 1 time in total.

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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Mon Jan 02, 2012 1:43 pm 
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Joined: Fri Dec 30, 2011 11:58 am
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Sorry for the wait, I took a nice video however my computer can't recognize the drive.. Here are some pictures. Hope it helps!

Edit: I also noticed that the line that comes from the head goes back into the air box, is that correct?


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File comment: This is what the bottom T goes to, it also has a line coming from the exhaust to this item.
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 Post subject: Re: Roketa gy6 vacuum and fuel line problem
PostPosted: Mon Jan 02, 2012 10:20 pm 
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I think you may need someone familier with California smog set up (My guess) If it was mine I would take off the stock airbox put on an UNI filter and rejet.. then cap off any uneeded lines- Pat

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