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 Post subject: Roketa GK-06 Engine questions
PostPosted: Sun Jan 09, 2022 12:56 pm 
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Hi everyone! I am new here, but I have a few questions. I got a Roketa GK-06 250cc buggy. I have changed carbs 6 times. It runs fine for a few days, then when I start it back up, it will start but as soon as I start to pull out, it dies like its running out of fuel. So in between carb changes, I bought a low pressure fuel pump. Same issues. Runs fine for a little while then starts cutting off like it loses its fuel. I have tried everything. New CDI, multiple new carbs. Would be a good idea to rebuild this engine and trans? Can I even find parts to rebuild it? Or should I try a Honda engine and if so, what would that entail? I am at a loss but want to fix it up.


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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Sun Jan 09, 2022 2:27 pm 
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Make sure your gas cap is vented.
Try it without gas cap

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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Sun Jan 09, 2022 8:58 pm 
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Make sure you do not have a leak at intake or exhaust ports. Did you adjust the valves on this engine yet? Have you taken a compression reading?

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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Mon Jan 10, 2022 12:33 pm 
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Funnyman wrote:
Make sure your gas cap is vented.
Try it without gas cap

I have tried that also. Even put a brand new tank on. Same results.


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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Mon Jan 10, 2022 12:35 pm 
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PGH wrote:
Make sure you do not have a leak at intake or exhaust ports. Did you adjust the valves on this engine yet? Have you taken a compression reading?

I have checked for leaks, but have not found any. I have not tried to adjust the valves as I do not know how they adjust. I haven't found anything that shows the procedure. As for the compression test, I will do that today and post the results.


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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Mon Jan 10, 2022 8:48 pm 
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Valve adjustment: https://infocenter.buggypartsnw.com/inf ... age_id=198

Michael has some good references and parts on his pages when you need help.

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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Tue Jan 11, 2022 7:31 pm 
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PGH wrote:
Valve adjustment: https://infocenter.buggypartsnw.com/inf ... age_id=198

Michael has some good references and parts on his pages when you need help.


Ok I adjusted the valves, didn't make much difference so I pulled the plug and did a compression test and its about 150 so is that good?


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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Tue Jan 11, 2022 11:19 pm 
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Did you take that reading with the throttle fully open? It is on the lower side but should fire. Drop a little oil into the cylinder and see if compression goes up - This would be a sign or scored cylinder or worn rings.

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 Post subject: Re: Roketa GK-06 Engine questions
PostPosted: Wed Jan 12, 2022 11:27 am 
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PGH wrote:
Did you take that reading with the throttle fully open? It is on the lower side but should fire. Drop a little oil into the cylinder and see if compression goes up - This would be a sign or scored cylinder or worn rings.

No. I just pulled the plug out and put the tester in and cranked it over. I will add oil and open throttle and see what it is then. It fires up, just runs awhile then dies like it ran outta gas. It takes a few to restart, but will only idle. Sometimes it runs for 45 mins to an hour. Other times only 5 or 6 minutes.

*Update*
OK so today I pulled off the engine and transmission and I am going to just go thru everything and make sure all is good. MY only question is, how do you seperate the transmission from the motor? Do you have to take the clutch off and go that route? Or should it slide off the shaft? Sorry for so many questions. Its my first offroad buggy and its kinda got me at a loss. I was able to pull the clutch off, inspect the gears inside the cover behind it, but not sure if thats how it comes off?


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