SYM Bonus getting swiftly ruined by Viet mechanics... Help!

[Visitor Q]

Well, my misery levels are getting pretty high at the moment.

My bike was cushty as fuck before I left, ran beautifully the whole way. By the end (thrashing it along the one good bit of road I found the whole trip) the cam chain rattle had got much worse, so I asked around for a GOOD mechanic, and everyone mentioned the same guy(s).

Good seems to mean 'speak English and overcharge you'. Anyway, I got there and the cam chain jumped off when I started it again to show them the noise.

We sorted that out eventually, and put in a better CCT. But they cracked the casing when they put it back on (fucking morons, criss-cross is rule fucking one).

Next day, bike just cuts out. Dead. No spark. I roll it to a near mechanic, and he eventually gets it going. But the bike now feels like it's not getting enough fuel, and lurches along. I think spark problem, so take it to the original guy and point out it was FINE before they fucked about with it.

Eventually leave it there over night, and come back to find a valve was alledgedly bent. Didn't look bad to me, but I put up with it, and took it home (I'm staying in a hostel JUST to sell it, in possibly the worst city I've ever stayed in... Hanoi).

But fuck it, it's fixed now right?!?! Nope, even worse and no power, and over heating like a fuck. Playing with the carb settings is achieving nothing, but the thing idles very well now. Just the moment the engine comes under load, it lurches along and the power is coming off and on.

I'm taking it back tomorrow, and I don't care what flux capacitor they put on it, I'm paying nothing. And I'm stealing their tools.

What could this be?

Killed alternator?
Incorrect timing?
Clogged air filter?
Dead battery?
Dead spark plug?
Clogged fuel filter?

The thing was PERFECT before I gave it to them. He's adamant he couldn't possibly have done anything to it. The bike is only selling for $300-350, and I've spent $30 at this garage already for them to fuck it up totally.

TL;DR ... 4t 125cc had its cam chain jump off when stationary. Put back on, but by incompetents. Next day spark disappeared, eventually fixed somehow, no doubt by dodgy wiring, as parts were fine. Bike power jerking on and off. Problem 'fixed' by replacing a bent valve (apparently), since then bike has no power, is sluggish, and the drive disappears at random.
What else should I be checking?
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...

[MickC]

From what you say:

'had its cam chain jump off'

If the valve timing was not set correctly when it was put back on, you could very well of bent a valve, I suppose you could also of damaged the plug as well ( if the valves are opening and closing at the wrong time burning fuel and gasses won't flow right)
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Previous: CG125,XS250 (converted to 400),Z250A, GPZ550, Norton Commando, XS500, 78 Laverda Jota, GPZ1100,Harris bonneville, XV750 (mono shock),TR1

[Visitor Q]

[unitynotsocri...]

one notch out on the chain usually results in a bent valve,done it to my own cb125s years ago.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[Visitor Q]

[unitynotsocri...]

hav'nt worked on that particular engine ,but.....the following fuck ups are possible (I know from my early mistakes!)

The cam sprocket may have been put on 180 degrees out,
the cam chain is one notch out.
they hav'nt checked the timing marks when refitting the cam.
the tensioner (usually automatic) is stuck,like on my mates cb500

If the head needs removing to do the job they could have misplaced the small metal tubes that go up the barrel studs which are commonly used as oilways.Or fitted a silly wrong gasket

thanks for mentioning agent orange,I'm sat here in my care home having fish n chips,but unfortunatly its vietnamese cobbler!still,i'm already brain damaged and when I'm better will be retiring on a nice ccm35 scrambler,or a bored out Mz 250 single so it won't affect me much.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[yen_powell]

Tankee come off, tankee go back on. Fuel pipee get squidged?
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[Rogerborg]

Blink twice if you need us to summon the British Consul to get you out of that moist hellhole.

Seriously, all you seem to do is moan about it. I can't understand why you're still there, earning rice money and shafting your chances of building a career anywhere else.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[unitynotsocri...]

No stay there Bonny,in a couple of years it'll be a richer country than Britain,or England as its now known to many of us.

Whores can be had here for a tenner(not my tipple at all,still shy about wanking),decent women are a lot more expensive,education costs 9000 a year and the minimum wage is still low.At least over there you can kill bush meat and get free coconuts.over here an knackerd cg125 will soon be fetching 700 with the hike in imports and the steady devaluation of our currency.
If you do come back here ,then fill up a container of cheapo 125 commuter bikes to make a decent wad.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[LordShaftesbu...]

What prompted the tour in the first place?

[Robby]

Timing (cam) is set wrong. Most likely because they have put the chain on with too much slack on the side opposite the tensioner, and not run the engine through 360 degrees afterwards to check the timing.

To check it you need to remove the inspection plugs on the crankcase and rotate the crank until you see the T mark in the upper window. You also need to remove the cam cover and make sure that the lines on the cam sprocket line up with the top of the cylinder head. This assumes the engine being a Honda clone, but should apply for just about anything.

The spark may have been crap in the first place. I've had a few kick start bikes where the spark looked very weak kicking it over on the starter, I assume it got stronger then the engine was running and giving it some more power.

[Visitor Q]

[Visitor Q]

Well, despite their insistence it was fine, I went round and just started stealing all their tools to inspect it.

The line was well not straight. Cocks.

Doing that, on my own, in the rain, competently stopped them being dicks at least.

Then it eventually started, but still wasn't running all that well. The owner was adamantly telling my the valve was probably bent again, and I should strip it all down

Luckily one of the shop imps turned out to be a decent mechanic, and had half decent English. The rocket for the exhaust valve turned out to be worn, so I had to replace that. They were trying to get me to send the cams off to get machined, but I managed to get them to just give me the rocker. It'll be good for a week apparently

Still stuttering when flat out in top gear, but that's probably carb settings. Was popping gleeful wheelies the whole way home.
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...

[stinkwheel]

Could the flywheel have eaten its Woodroffe key and spun-up when they dinged it against the valve the first time (then probably jumped on the starter a bit just to make sure it was definatley not turning over). If the flywheel has moved, your valve and ignition timing marks mean exactly fuck-all.

EDIT: Should've got a C90.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Visitor Q]

Perhaps. But I aint going down there. It's good enough to sell now. No cunt wants to give me even half of what it's worth.

However, it's running very well now. Still stuttering when flat out, but that's probably the carb settings.
____________________
China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...