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Ducked |
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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 Posted: 06:05 - 04 Feb 2025 Post subject: Bloody Thing Wont Start |
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SYM Wolf as before
Its got what appears to be an OK spark
I think the valve timing and clearances are set approx OK
(I used a ballon to confirm compression stroke, in case I was somehow on't exhaust)
My compression tester may be knackered, having been flooded last typhoon, and I dont have a screw in adapter that fits so am restricted to the conical push-on, not good when kicking it, but it has generated quite high numbers a couple of times, it makes popping noises and displaces my thumb off the plug hole OK, so I THINK its got compression
Kicking it over with the air filter and carb throttle slider removed, the carb top blocked and a paper towel over the air intake it floods fuel into the cylinder, so AFAICT it is at least capable of fuelling
Out of ideas,, apart from trying fresh fuel , though that stuff has been in a sealed can so should be OK
Suggestions? |
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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slowasyoulike |
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 slowasyoulike Scooby Slapper
Joined: 17 May 2021 Karma :     
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doggone |
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 doggone World Chat Champion

Joined: 20 May 2004 Karma :    
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Ducked |
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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Ducked |
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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slowasyoulike |
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 slowasyoulike Scooby Slapper
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Ducked |
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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 Posted: 12:17 - 07 Feb 2025 Post subject: |
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Yeh, did that with my last car, a 1986 Daihatsu Skywing. Tried to understand it and it gave me a headache, plus my choke stopped working, so I took it all off and never thought about it again.
This isn't so complicated though, and I'll have to get reasonably consistent fuelling before I can really address anything else. Today it wouldn't hold fuel again, so its consistently inconsistent.
I spent a long time adjusting the float level earlier, and have polished the valve seat with toothpaste and cotton buds. It looks ok, but it just wont work reliably, and, short of buying another carb, I'm about out of things to try. |
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A100man |
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 A100man World Chat Champion

Joined: 19 Aug 2013 Karma :   
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 Posted: 14:56 - 07 Feb 2025 Post subject: |
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Ducked wrote: | Yeh, did that with my last car, a 1986 Daihatsu Skywing. Tried to understand it and it gave me a headache, plus my choke stopped working, so I took it all off and never thought about it again.
This isn't so complicated though, and I'll have to get reasonably consistent fuelling before I can really address anything else. Today it wouldn't hold fuel again, so its consistently inconsistent.
I spent a long time adjusting the float level earlier, and have polished the valve seat with toothpaste and cotton buds. It looks ok, but it just wont work reliably, and, short of buying another carb, I'm about out of things to try. |
Buy another float needle and fit an in-line filter to minimise crud ingress. Longterm give the tank and damn good claen out - many methods to do this from shaking with gravel to mollasses. ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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Ducked |
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 Ducked Two Stroke Sniffer
Joined: 07 Jun 2024 Karma :    
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 Posted: 05:20 - 08 Feb 2025 Post subject: |
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Thanks. I dunno if a float needle is available separately. Probably wont be locally (in Taiwan) but maybe on't internyet.
I did have one from a scrapped Kymco Zing, which might be compatible, but seem to have lost it.
The rubberised needle tip looks ok under magnification
The tank didn't seem to be dirty. I got a new (oversized) fuel filter for it anyway, but Im not yet using the tank, but a test lashup with scrap dialysis tubing.
This has a plastic mesh inline filter in it, as it happens, but I suppose it might be worth adding another one, and/or using a coffee filter in the funnel when refilling, for belt n braces.
Found the kymco Zing needle (I'd wrapped it carefully in foil which I didnt recognise). Looked OK under magnification, but a bit greyer and less shiny than the other one. perhaps suggesting some surface corrosion.
Bench tested, the weight of the floats (i.e. with the carb inverted) on the valve holds fuel, but the right way up with the float bowl filling it leaks.
I could try cleaning it up a bit more (I just rubbed it gentky with foil for this test) and bending the float tang to apply more pressure, but I'm not optimistic. |
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