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Post by dansrockin on Feb 10, 2013 11:32:30 GMT -5
Hi all, I realize this isn't the correct place for a first post but I'm in a bit of a tight spot as I need to try and remedy my girlfriends scooter pretty urgently. It's a 125 sukida sportman with a gy6 engine, done around 3000 km. It's been running ok for the last few months, she uses it around town to get to work and back, and apart from a frozen throttle cable and a faulty cdi, it's been fairly good so far. Yesterday on the way home from work she said it started juddering as she went uphill and then it died and would restart. After pushing it home, we managed to restart it a couple of hours later, and she took it for a spin and had no problems. This morning she went out on it and managed about a mile before the same thing started to happen. I took it out and it seems to be running fine at low throttle but much over half way and it just bogs down, go back to under half throttle and bit runs ok. It's almost as though its not getting any fuel at open throttle positions? Anyway, I left it a few hours and went back outside to try it, and it seemed to run fine at all throttle positions, which leads me to think its running ok when cold but as soon as it warms up its having fuelling problems. Sorry for the long ramble but I don't know much about these engines and am hoping that someone else may have had similar problems before and can suggest a cure? Thanks Dan
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Post by edfr on Feb 10, 2013 12:23:27 GMT -5
First thing is Adjust the valves set them both to .004 inchs it sounds like the valves are staying open after it gets hot and then it loosses compression and will not run good again until it cools off and it repeats. Lefty
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Post by dansrockin on Feb 10, 2013 12:39:47 GMT -5
Would the valves not affect the low throttle openings though? It runs fine below half throttle even when it's hot? I must admit the valve haven't been checked yet so ill take a look just I case. Thanks
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Post by prodigit on Feb 10, 2013 12:55:43 GMT -5
Clean the carb, filters (air, oil, gas), would be my first steps...
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Post by wilds on Feb 10, 2013 12:58:02 GMT -5
Since it's only giving you problem when the engine is warm, it could be the electric choke that's causing this.
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Post by dansrockin on Feb 10, 2013 13:16:08 GMT -5
Thanks for the replies. I'm taking the carb off tomorrow and going to give it a clean through. The choke was my first thought, but again wouldn't that affect all throttle positions and not just at full?
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Post by dansrockin on Feb 10, 2013 14:18:19 GMT -5
Just out of interest, I've seen I can get a new mikuni carb that includes an electric choke for £30, would that be any better than the carb that is fitted as standard? I'm just thinking if I've got to spend £10 on a choke would it be worth spending £20 more of the carb is substantially better?
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Post by wilds on Feb 10, 2013 15:12:57 GMT -5
It could be that it get to much fuel on full throttle when it warm if the choke is still on. Hopefully you get it to work properly after cleaning it and that way you don't have to spend any money at all.
IMO any other carb is much likely to be better than the original one.
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Post by dansrockin on Feb 10, 2013 15:18:31 GMT -5
Thanks, fingers crossed that it gets sorted. My girlfriends only been riding a couple of months now and almost every time she's been on it something has happened and she's starting to get a little disheartened with it!
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Post by justin010304 on Feb 11, 2013 7:32:17 GMT -5
I had a very similar thing happen last fall, ended up being a bad coil.
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Post by dansrockin on Feb 11, 2013 16:34:51 GMT -5
I changed the coil and cdi about a month ago so hopefully it isn't them. I put a new mikuni carb on today in the hope that it will sort any carb/choke issues and it seems to be running better. Ill try and do the valves over the next few days too. Thanks
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