Would anyone trust these trademe bikes?

[grantman]

Hi Alan
Whats the one I should use in my GRC rep?
NGK?
Cheers

[CookMySock]

NGK is probably the most widely used and respected spark plug for bikes. Just check that the electrode length is the same as the one you took out, set the plug gap, and turn it in all the way with your fingers before you tweak it firm, not tight. Pull the engine over gently a few turns first to make sure its not interfering.

Steve

[BigAl]

Hi Alan
Whats the one I should use in my GRC rep?

I'm using an NGK B7ES, Grant.

[grantman]

Thanks

Will get one for next meeting
changed the front sprocket and its heaps smoother now

Slowly getting there

[FLYMO]

for the little 2 strokes as long as ur using a ngk plug that doesnt havea "p" in the code u shouldnt have a problem with the piston hitting the plug
the "P"stands for protruding

[Laxi]

can anyone help me with a problem im having with 1 of these bikes? it starts 1st pull every time, idles fine, revs fine but then when the kids try to ride it it bogs and hardly moves then dies

[Gadgit]

Smokes before cutting out?? or clean?

Leaning out. Clean carb if thats the case. Check spark plug if it's the one it came with then biff it and get a NGK, champion or denso replacment this may also be the cause. Has the coil moved this can cause weak spark if it's too far from the flywheel. blocked air filter lack of air under load.

[Laxi]

Smokes before cutting out?? or clean?

Leaning out. Clean carb if thats the case. Check spark plug if it's the one it came with then biff it and get a NGK, champion or denso replacment this may also be the cause. Has the coil moved this can cause weak spark if it's too far from the flywheel. blocked air filter lack of air under load.

thanks for the info, havnt noticed smoke, changed the spark plug out when i got it, checked that and not fouled, will check the coil and clean the carb and see if that fixes it

[CookMySock]

can anyone help me with a problem im having with 1 of these bikes? it starts 1st pull every time, idles fine, revs fine but then when the kids try to ride it it bogs and hardly moves then dies

I'd get a new plug and close the gap up a little, and then try that. These little engines are not really designed for kids to putt around on them - they foul up and go nowhere. They are intended for a good caning on the track.

You might try a hotter sparkplug in it - it will not foul so quickly then.

Steve

[Junkers]

Thought I would add my experience on here despite the oldish post.

I bought one off the trader in question and had a few problems with it. The starter snapped after 4 pulls, after replacing that i found I had a complete dud bike. It's true, they will NOT honour their warranty in anyway unless you want to pay for shipping ($130 there and back in my case) and have not changed a single thing about the bike.

To be honest I have been through numerous carburetors (including a dellorto rep), a few starters and one replacement motor. But If I were to loose the bike some how I would buy another, they are so much fun when they work. Today my genuine dellorto PHBG 19BS carb arrived. I might throw up a thread when i get round to putting it on.

On the other hand my flatmate has one which hasn't had anything go wrong with his except the original starter snapping and the footpegs falling off. Lucky bastard.

If you don't mind fixing the thing, having a few tantrums and having people laugh at/with you, GO FOR IT.

[newmanz]

i bet that trader is very very very very very very very very dodgy......i could go on but its late..........

You get what you pay for.
Cheap bikes are made from low quality parts
As long as your not track racing it is not a problem, if you are going to track race I would go and view the bikes first,

Check;

welding : are the welds good, no air bubbles, no gaps, nice clean welds (almost impossible to find good welds on cheaper bikes)

Frame : is it straight? ( you can see from the sides and just a basic measurement from A to B, is the frame even ( most factories on cheap bikes just hold the steel and weld... no actual quality control.. just the Ol Eyecromiter... looks straight... so it is kinda stuff

Get them to run the bike for you ( or you may get it home and it wont start.. faulty coil or carb... cheap enough to fix but a pain if you have to take bike back

Cheap bikes are a good place to start, parts are easily available and you can make a cheap bike run well with a few good parts.

ALWAYS UPGRADE THE SPARKPLUG TO AN NGK PLUG !!!!!!!!

[{.bLanK}G_o_D]

Not only is the NGK a better quality spark plug x10, I have heard that the Torch plugs that come with many of the Chinese bikes have a tendency to fall apart and damage pistons bores etc.
The left foot peg on my D2 rep broke the first time I put my foot on it. The right broke 5m down the drive. Brought some 30mm nylon rod, cut it 80mm long, drilled a hole (11mm IIRC) 50mm deep into the end and hammered it onto the metal shaft where the foot peg bracket goes.
Not only are the welds crap on most of them, but the metal they use is of very poor quality. I chose to braze all of our repairs rather than weld them, the metal is so brittle that it breaks around a weld, the welds, poor as they are, don't usually break. The side fairing brackets are the first to go, and when they do they take a piece of metal out from the main frame rail which weakens the frame to a point where i reckon it'd bend in half or snap right at that point. Any one have any photos of that?
Don't get me wrong, these things are a bundle of fun, if the Chinese never built these cheap crap ripp offs, most of us wouldn't be riding minimotos.