puegeot speedfight 50cc, wont start 2 stroke "urgent pl

[Deano]

Rite, just swapped my shocks front and back. Started the bike so I could go for a test ride and it was flooded so the bike really revved quite alot for a few minutes in fact at full revs. after a few minutes the bike died down and cut out.

I tried to re-start the thing and it won't start. at first, I thought it was flooded again, so I took the spark plug out and kicked it a few times to spit fuel out of the cylinder head. didn't work. so I took the carb apart to see if the float bowl was jammed, which it wasn't but i did find some crap at the bottom of the float bowl which I quickly removed and checked for any blockages which their were none.

IM just really stuck at the moment, the sparkplug is oil fouled so Im fearing the worse, which won't help my situation at the moment.

[lllN30lll]

it shouldnt rev at full RPM if its flooded, it should bog down and cut out.

are you sure it isnt an air leak between the carb and engine?
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Turbo R1
CRF450R

[garry]

if plug is realy oiled..........pop plug and test compresion ...
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so long so long so long and thanks for all the fish !

[Deano]

Compression seems fine. when I was testing for a good spark I put a cloth in the sprakplug hole and the compression would pop the cloth straight out.

the carb is tightly screwed on to the engine.

I also retraced my steps earlier and found that I had accidently blocked the furl tank vacuum hose by clamping it. sorted this out but still no better.[/code]

[lllN30lll]

take the carb off and make sure its properly sealed with some gasket sealent.

one slight leak and it will revs it's sack off like you said it did.

also check to make sure your carb slide or cable isnt stuck, you'll have a job to start the bike if the throttles stuck open
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Turbo R1
CRF450R

[Deano]

just took the carb apat again and cleaned everything out. whilst I was check the throttle cable which was not jammed. still wont start.

even when I flip the throttle open when starting the ped it doesn't make much of the boggin noise it usually does. I still think its majorly flooded.

just left the sparkplug off to try and dry out any fuel/water/wd40 that might be in their.

anyone else got any suggestions? the thing has got a good spark and the carb is fine.

Anyone please I really need this thing working for tomrrow!

[Deano]

i just remembered something. when the bike started and started to rev its nuts off I put had to put the back brake on to stop it goin all over the place.

will have this cause any damage?

[lllN30lll]

u said it went at full rpm for 2 minutes, why didnt you hit the killswitch or turn it off?

are you sure theres petrol in it lol
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Turbo R1
CRF450R

[Deano]

No worrys, its fixed now. looks like I really really flooded it, I took the sparky out and left it for 2 hours and started it first try.

their is no killswitch mate and not that much of an amatuer to not check the fuel mate.

[sickpup]

[Deano]

Hows that amateur-ish and my post was not me bein stuckup.

[sickpup]

The bike was reving it's nuts off out of control and you let it when turning the key would have stopped it.

[lllN30lll]

IMO that is amateur'ish
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Turbo R1
CRF450R

[Deano]

hmmm, the bike has an automatic choke, so it does it every time the thing starts up cold. I was only worried by the fact that it did it so long because of the potential engine damage.

[sickpup]

The auto choke will not cause the engine to rev its nuts off and is on for more than the 2 mins that yours reved for.

[Deano]

OK, I suppose you know from experience from owning a peugeot speedfight 50 then

[sickpup]

No I just know from experience of being a service manager in a place that dumped Peugeot due to bad quality control.

Been a while since I worked on one but isn't the auto choke a brass enclosed heater element or something in the carb? If so how will this make the engine rev its nuts off?

Do you want help or do you want an arguement?

[Deano]

nope I don't want an argument, quite the opposite. from what I can see the gurtner carburetter is heat sensitive (obviously) which when it detect that the engine is cold it opens another feed of fuel into the suction of the engine, not too sure if it atomises the fuel though probably just dumps loads for a certain tim period or when the right temperature is reached.

I've spoken to the Andrew and anthony from this website. Thats who I got the moped from and apparently a bad batch of my speedfight 2 50cc's had carburations faults. One of the parts inside the carb had to be changed. this ped hadnt had the change done because apparently anthony would of had to pay £50 to get it replaced and fitted. this fault caused bad idle, so alot of cutting at at low revs and apparently sometimes when starting from cold you would rev the bike and it wouldnt move anywhere.

it will be eventually replaced but Im doin one thing at a time as Im short of money

[ancientd]

I've repaired Speedfights and Vivacitys for the last 5 years and none of them has ever reved up un controllably when started from cold, I would suggest that your carburettor is seriously in need of an over haul and certainly the Cold start device needs checking. On choke the bike should not pull if the rear wheel is held on the ground, and the engine should never be left running faster than a quick tick over, no more than 2k rpm.
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I ride 3 bikes, a Thundercat, an FZRexup 1000 Streetfighter and a Jawa 350 Combo, something for all seasons.

[andrew]

[ancientd]

Mmm, a little knowledge is a dangerous thing, if you don't know what you're doing get someone who does to help you. It sounds to me like you are making the problem worse by tinkering.
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I ride 3 bikes, a Thundercat, an FZRexup 1000 Streetfighter and a Jawa 350 Combo, something for all seasons.

[andrew]

[ancientd]

Typical scooter, if you leave them ticking over the engine gets too hot and the mixture leans out too much, so if you give it a handfull it will stall, splutter and even stop.
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I ride 3 bikes, a Thundercat, an FZRexup 1000 Streetfighter and a Jawa 350 Combo, something for all seasons.

[andrew]