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Post by milly on Dec 2, 2019 18:05:51 GMT -5
I should know the answer to this one as done it a few years ago but memory and age etc.
Basically used 18mm carb on 80cc conversion. Cleaned carb properly upjetted main to the same as I did my son's conversion to 85 main jet. Needle on middle position or possibley top position out of 3 on needle. Starts fine, idles fines, rev's fully out on stand fine, take it down the road and only works fiine till it gets past idle circuit and then splutters and stalls till back in the idle circuit range. I am sure a few weeks ago I got it back to the garage by just opening and closing the throttle fully really fast but could have been another scooter but I dont think so. Not had chance to check condition of plug as usually dark wet or freezing after I get back there. It's running with a manual on and off tap and that appears to be flowing ok and no vacuum problem with tank. Help appreciated Thank you
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Rune 75
Scoot Enthusiast
Posts: 441
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Post by Rune 75 on Dec 3, 2019 4:35:18 GMT -5
If you remove the air filter box/cover, does it get better or worse?
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Post by dexameth on Dec 3, 2019 10:29:12 GMT -5
Sounds to me like it's the needle position giving you problems. On the stand there's no "load" on the engine to rev up, but as soon as you put a load on it there's an issue... worth a shot
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donaldsonta
Scoot Member
Posts: 30 
Location: Columbus, Ohio
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Post by donaldsonta on Dec 3, 2019 12:41:53 GMT -5
Any chance of a ripped diaphram?
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Post by GrumpyUnk on Dec 3, 2019 12:42:59 GMT -5
Take a look at the diaphragm. And the needle. It is easy to bend the needle, and that can cause it to bind. If the diaphragm is not sealed around the edges, with the 'nub' in the little cutout, it is possible the slider won't rise up when you open the throttle and the engine starts to rev up. Make sure the slider is free to move up and will fall back on its own.
IMO variations in the needle position will make some difference, but it is more 'tuning' than general operation. IOW, it should run with little problems, maybe less power, if the needle is up or down from 'best position', but not be the end of the world. If it won't run, then something else is causing the problem. If it coughs and spits, and pukes black smoke out of the tail, it's likely a lot too rich.
tom
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Post by milly on Dec 3, 2019 13:32:35 GMT -5
Thank you all I shall check friday when back from work. I am sure the diaphram is ok and needle not bent though. Usually if I remove airfilter it never runs right but I shall give it a go and see and check plug.
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Post by dexameth on Dec 3, 2019 13:55:33 GMT -5
Thank you all I shall check friday when back from work. I am sure the diaphram is ok and needle not bent though. Usually if I remove airfilter it never runs right but I shall give it a go and see and check plug. I would think that means you are lean all around. If you take the filter of and it gets worse, it's leaning out even worse. My stock 49cc was from the factory too lean. Had to purchase a tamper-proof carburetor and that alone let it run a lot better. |
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Post by milly on Dec 8, 2019 9:02:29 GMT -5
Well to date carb diagrams ok old plug bit brown change plug won't fire up at all on electric start and kick start can be described as slips when kicked over.😊
Start again in the week.
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Post by aeroxbud on Dec 8, 2019 18:40:50 GMT -5
Quick Milly. You need to install one of those anti gremlin bells.
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Post by FrankenMech on Dec 8, 2019 22:46:46 GMT -5
I think his scoot is already infected with gremlins. He may also have the diarrhea touch... I don't know of any cure for that. It usually only ends with death.
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