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  #1  
Old 02-27-2016, 05:26 PM
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Default need help with goped motors

Yesterday I traded some gear for a goped. It started up but was running funny. It's a Chung yang 230rc

today I cleaned the butterfly carb screen filter out (it was dirty) and now it won't even turn over...at all.

I have the worst luck with these little motors now...

I even made sure to keep everything clean but I guess I messed up...

I'm close to breaking down and buying a new engine from ddm when my tax return comes...

what can I do?
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  #2  
Old 02-27-2016, 05:30 PM
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Did you take the carb apart and clean it or did you spray carb cleaner into the screen which pushed all the dirt and muck right into the carb itself?
Hopefully it's scenario 2 and I would suggest actually cleaning the carb by taking it apart and giving it a brake cleaner and toothbrush bath. Or be lazy and soak it overnight in a tub of carb cleaner to break up the deposits. If it worked beforehand there's not much you did unless you had the motor running while you sprayed it.
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Old 02-27-2016, 06:13 PM
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Getting spark?
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Old 02-27-2016, 07:56 PM
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Quote:
Originally Posted by rachidfunaki View Post
Did you take the carb apart and clean it or did you spray carb cleaner into the screen which pushed all the dirt and muck right into the carb itself?
Hopefully it's scenario 2 and I would suggest actually cleaning the carb by taking it apart and giving it a brake cleaner and toothbrush bath. Or be lazy and soak it overnight in a tub of carb cleaner to break up the deposits. If it worked beforehand there's not much you did unless you had the motor running while you sprayed it.
All I did was scrape out the junk and then I took a rag and squeezed it in there and turned it to get the remaining small specs stuck in the filter.



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Originally Posted by massivespl View Post
Getting spark?
It did last night so I assume so
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  #5  
Old 02-28-2016, 03:55 AM
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First of all, I only tinker with small engines, I do not know much about them!

Not familiar with goped engines at all, does it use the small square style carb like in a weed eater / chainsaw?

If so I would fully disassemble it, inspect the metering / pump diaphragms, remove / clean the needle / pin, and force some carb cleaner through ALL the little passages. Cleaning just the screen may not be enough and the diaphragms may be in bad shape. Also make sure you reinstall the diaphragms correctly. (your carburetor may be completely different that what I'm use to, so disregard if it is).

My newish push lawn mower wouldn't start after sitting for a bit, was only used a few times as I decided to use some junker mowers I picked up free. When I went to use that it wouldn't start for nothing, only a little starting fluid would fire it for a couple seconds. Turns out something plugged the jet in the carb, cleaned it out and it was good after that; it doesn't take much to stop fuel flow. Maybe the gas was going bad.

Have you sprayed starting fluid / carb cleaner into the carb and see if it will fire for a few seconds at least?

Can buy rebuild kits cheap, but you need to clean the carb 100%, if any passages / jets plugged, the rebuilding will be a complete waste of time. You can even get some brand new carbs dirt cheap on ebay.

I'm no expert so do some research on that particular engine. Most of the small engines are not too difficult to work on and info is easy to find on them.

Depending how old it is, a compression test might not hurt. I don't trust people with 2 strokes, may not have always ran the proper oil. Me and friend in the mid 90's got his sisters old moped out of their shed (she moved on to a car and left the modep sit), and we had no idea about 2 stroke engines. We ran it on gas only until someone seen us filling it up and pointed out it needed oil mixed in, oops. Didn't kill the engine and I still have it, tore it apart last year, cylinder looks pretty good but had stuck piston rings, though it has sat since the late 90's.

Not sure what kind of kill switch those use, but make sure it isn't damaged or any wiring.

I thought there was a goped forum you were on, would assume they would be the best source to ask for help
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  #6  
Old 02-28-2016, 05:59 PM
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Quote:
Originally Posted by Pioneer621 View Post
First of all, I only tinker with small engines, I do not know much about them!

Not familiar with goped engines at all, does it use the small square style carb like in a weed eater / chainsaw?
walbro 668, 603 or WT 40, typically. Or slight variations. Those are the 2 I have though.

They pretty much all look/operate like this. High and low jet, primer bulb, fuel intake and output.

http://i.imgur.com/XIxlf4G.jpg




Quote:
Originally Posted by Pioneer621 View Post
If so I would fully disassemble it, inspect the metering / pump diaphragms, remove / clean the needle / pin, and force some carb cleaner through ALL the little passages. Cleaning just the screen may not be enough and the diaphragms may be in bad shape. Also make sure you reinstall the diaphragms correctly. (your carburetor may be completely different that what I'm use to, so disregard if it is).
I could not remove the little gasket that has the revolver looking metal piece. I'm assuming that's a diaphragm? It was kinda "welded" into the metal pretty good.

But I will try this on my other 2 carbs that I'm not using. I might just order a carb rebuild kit for $10 though.


Quote:
Originally Posted by Pioneer621 View Post
Have you sprayed starting fluid / carb cleaner into the carb and see if it will fire for a few seconds at least?
Not yet. I got it to start for a few seconds and it idled. I let the spark plug out for a day. Now it just floods with gas and it's coming out of the exhaust.

Quote:
Originally Posted by Pioneer621 View Post
Can buy rebuild kits cheap, but you need to clean the carb 100%, if any passages / jets plugged, the rebuilding will be a complete waste of time. You can even get some brand new carbs dirt cheap on ebay.
I have 3 extra so I think the rebuild kit is the best route. I'm just now understanding what they are and what they do. Seems like they would make the carb brand-new.

Quote:
Originally Posted by Pioneer621 View Post
I thought there was a goped forum you were on, would assume they would be the best source to ask for help
There was gopednation but admins abandoned it. And the new board is moderated by *******s, so no real place to ask.
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  #7  
Old 02-28-2016, 06:02 PM
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Maybe the bowl/ float is stuck
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Old 02-28-2016, 06:17 PM
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These engines don't have those
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  #9  
Old 02-29-2016, 01:05 AM
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So it is basically a typical trimmer, chainsaw, blower, etc. style carb.

If we are talking about the same part, the peper'ish one with the revolver looking metal circle on it is the metering diaphragm.

Usually is thin diaphragm sitting on a paperish gasket, and they can be difficult to remove sometimes. I use a razor blade taking care not to damage that or the aluminum as it needs to seal again. You can usually get them out without damage if you take your time.

The rebuild kits do make them pretty much new again, however, that is assuming you can get the gunk out of the carb itself. There are several tiny holes / passages that can be plugged and not always easy to clean. I'd compare the price of a new carb on ebay to the price of the rebuild kit, sometimes it is only a few dollar difference, sometimes a big difference so depends if it is worth the trouble.

There are almost always "extra" parts in the rebuild kit if you've never done one, so don't freak out when there is way more than you need, lol. The kits are usually put together to do a few different carburetor models. Some also come with Welch plugs (it is usually advised not to remove the original Welch plugs as the new ones will be difficult to install.

Not sure why it would be flooding with gas, could indicate another issue, I'm in the same boat as you, just play around with the stuff. I'd for sure check for spark, and don't forget to crank over the engine without the plug installed to shoot out any remaining fuel from the cylinder before putting the plug back in.

There are a LOT of youtube vids on rebuilding these style carbs which can be very handy. Just type in "trimmer carb rebuild".

This guys vid is pretty good. Your carb may be a bit different, but they are all the same basic design, of course some things may or may not apply to yours. Again, many vids on there.

www.youtube.com/watch?v=7VM6ZAT96o0

This vid might help, but only watched a few minutes, so IDK, but looks like they deal with scooters.

www.youtube.com/watch?v=J3J0xSb9hiY

No idea why it looks like extra vids showing up, but whatever.
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  #10  
Old 02-29-2016, 01:27 AM
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Which motor you have on it? I would scrap that and go to a polini engine which i sure some do come with it. I have a 50cc 5 port watercooled polini engine for my grc mini moto
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