dead moped need for work help pleas :(

[lonie]

Hi there, ive been a member on the forum for a while now and contributed on few threads.
however this problem has me stumped.
ive worked on mopeds before and have a decent idea of there workings

so heres my problem,
basically i live about 2 miles from the city centre and can walk or cycle to work, but i love mopeds and bikes so have one to commute on. i recently sold it and bought a better one (or what i thought was better) it did go a fair cop when i bought it at around 40 mph indicated, with decent acceleration. i took her out for a spin and she was beautiful, then as it had been stood for 3 weeks prior to me buying it i thought i could use a quick hoseing down. I broke ot the hosepipe and spraid her down and took it out again to dry it off. At first the problem was small, just a little judder on moveing off but with beeing a little 50cc 2 smoke it seemed normal. Then it did it again at a roundabout more seriosly this time, as soon as i pulled back on the thottle it bogged right down and wouldent go past 5 mph 10 at a push so i had to keep the throttle on to keep moveing and after a minute or so it suddenly took off and acted normal, untill i next stoped then again as soon as the throttle reaced a certain amount of revs it bogged down.

so theres the story heres the details
when i pull back on the throttle it boggs down
it sounds asthough its about to die sluttering and choking
first things first then i changed the plug still no change so i thought right blocked jets?
off with the carb and there was a fair bit of sediment in the base of the carb butt nothing major
cleand oud with carb cleaner rinced with fresh fuel blasted the jets with compressed air ... still no improvement
so air filter? nope took it off cleand it out relaced it still nothing
ok so possibly electrical unlikely but possible i cot water in something
so left to dry for a day put vasaline on elecrical conneections now it got better now itl abosoulutly fly to 10 mph but then bog down to 5 again
:(
contaminated fuel?
nope emptied tank checked fuel filter and replaaced with new fuel
back to square agaian :(

ok so thats aboutt it then
heres the moped specs i hope some of you more experianced hands can help me out

peugeot zenith 49cc:
13,000 km
2 stroke
frresh oil
fresh petrol
clean carb
new plug


any help much apreciated as it would be ideal for traveling again getting tired of cycleing
thanks
lonie

[doggone]

If it only started doing it when you squirted it with water, electrical seems the first place to look.
I think if you got water in the fuel it would stop altogether more likely.

If you're lucky it might sort itself out left to dry in the wind - it is nearly June after all.
Most likely problem areas where moisture is lurking would be spark plug cap, HT lead from plug, and the Ignition Coil (HT leads go to this).
The coil can fail in rather strange ways giving misfiring and intermittent loss of power.
Quite cheap to replace and you should be able to do yourself.
Also check the earth lead is making good contact with the frame.
If it looks less than perfect undo it, clean up, and re-tighten.

First thing to try - look for water in plug cap, spray with WD40 or similar.

[lonie]

thanks for the reply the moped has now been sat for 3 days to dry out so i would assume theres no water lurking in the electrics howerver i will look at the plug cap and price up a new coil my first thoughts were fuleing isuses but ive check everything from the tank to the inlet manifold

ill go check the plug cap now and post back the results

[27cows]

Disconnect every wire you can find and attack it with WD. And don't miss the ignition switch itself (and the kill switch, if your bike has one).
____________________
The RXS100: vehicle of choice for Chuck Norris

[lonie]

hey guys,
sorry for the delay in replying had a few family issues to sort.
went out and did as you suggested.
attacked all the connections with wd40 and cleaned them all up took the plug cap off and attacked it with a cloth and wd40 plugged everything back in and...no change. realy running out of ideas here
im thinking the coil is to blame ??? if somehow water got into the coil and ruind something maybe it could have faild?

keep the suggestions comeing please im going to go back out and doubble check everything

thanks
lonie

[27cows]

If water gets in the coil, normally you get misfiring or weirdness when the motor is running, so it could be that. Bearing in mind that the electrics are designed to withstand frequent downpours, it takes a fair bit to stop bikes running generally speaking.
____________________
The RXS100: vehicle of choice for Chuck Norris

[snowdude2004]

I had a very similar problem on my GPR where when I twisted the throttle could only get to 3k revs on full and it would just cut out and die.
If you've replaced the petrol, checked airbox etc as stated and your spark is blue as it should be then you can do exactly what I did which cost me 60 pounds to get diagnosed, Decoke your exhaust....
____________________
CBT passed: 26/09/09, Theory Passed: 18/08/10, Mod 1 passed: 20/10/10, Mod 2 passed: 26/10/10.
Current Bike: Honda CBR 400 Nc23

[cb1rocket]

I had something if i recall similar, its possibly is electrical

Have you got a dodgy ignition switch? Side stand switch and clutch switch and also kill switch should be by passed to eliminate.

A slight vibration can break a contact and kill the engine!

Check the above and see how it goes

Sorry just realize its a moped, but do check the switches thou esp the kill switch and ignition switch.

[lonie]

ok guys,
Spent this morning in the shed again checked every switch connection and wire i could find and attacked it with vasaline and wd40.
i eavan hooked up an external fuel source to check it wasent crap in my fuel eavan tho i already cleand the tank and put fresh fuel in.

i seem to think it culd be as snowdude says and it may need de-cokeing

what do i need to buy is it caustic soda or something?
and put the exhaust in a bin overnight?
would a blocked exhaust do this?
acn i check it is coked up before doing it?

[cb1rocket]

I meant take the plug apart and short the circuits to by pass the switches. Spraying WD-40 doesn't always work. You need to actually physically take the plug off the loom, and bridge the correct pins to eliminate any circuit problems.

Your need a multimeter to perform this task properly

[lonie]

how do i bypass the ignittion ? it dosent have a kill switch

[cb1rocket]

you need to get the covers off, and disconnect the plug and bridge the connection so its permantly on.

You need a multi meter to find out which wire turns on with the ignition. Then bridge the connection that the ignition harness plugs into.

While you have found that out, see what the engine runs like.

An intermittment (which i had a problem with) fault with the ignition can cause lots of headaches when its looks ok but it isn't

[lonie]

unfourtuneately i dont have a multimeater so insted i took myignition swich off got some spare bits of wire turnd my indi switch to the left and proceded to connect every wire fin every combination i could untill i heard that loverly soft ticking then meant my indicator was working ducktaped the wires in place and took it for a spin well exited and still no change

i think i may go down the de-coke the exhaust route
see where that takes me

[Robby]

So it's idling ok, but failing/bogging down as soon as you crack the throttle open. This happened when you got the bike wet, so I'm going with water in the carb.

An electrical problem should manifest in a more random way.

If the carb has an accelerator pump, then water likes to sit in the bottom of the chamber and kill your engine every time you open the throttle far enough to bring the pump into play.

Drain the carb into something like a glass, so you can look for water in the fuel. My current favourite easy method to fix this problem is pouring meths in the fuel. Meths binds with water and stays flammable. Petrol will not mix with fuel, so the problem won't fix itself.

[lonie]

hey Robby thanks for the reply is there anyting other than meths i can use somehting i have lieing around as money is a little tight atm would something like wd40 work?

[cb1rocket]

Drain the fuel as Robby said, far easier.

[lonie]

i dont know weather it makes a difference but i have already draind all the fuel and celand the carb out and put fresh fuel in that was the first thing i did after buying a new plug

[lonie]

well this may be interesting to know i took it into the suzuki centre yeasterday for them to look at i started it up and almoast immeadiately they said ohh yeah fuel taps definately knakerd... so i paid for a new tap and for them to fit it and guess what it wasent at all causing the problem

[Robby]

Does the carb have an accelerator pump?

When you stripped and cleaned the carb, did you clean the pump chamber?

[lonie]

i striped the carb down again yeasterday to check but no i dont think so
any other ideas?
thanks
lonie

[lonie]

im going to go trough this methodicaly so im assumeing its a fuleing problem.
so im going to run trough the fule system and tell you what i have done:
tank: emptied and cleand now has fresh fuel
fuel tap: replaced
fuel line: removed and checked for blockages and tested with a differnnt pipe
carburetor: removed cleand blasted with compressed air and carb cleaner
spark plug: replaced and gap tripple checked
barrel and piston/rings: not checked
exhaust: not checked

[Carl_steveo]

What happened to that Kinroad thing you had.
____________________
Current: Honda Nsr 125
Live: Sunderland
Luke "cant be arsed to read your post, but suck my balls anyway."

[lonie]

still got it...kinda,
i took it in for its mot and it failed due to a break in the frame

so its sat in there lockup untill i either find a new frame or tell them to scrap it :/
shame cos it was a nice bike once i have this moped runin, so i can get to and from work i should have alittle more space
so i can bring it home and possibly get it welded anybody know a cheap welders in york?

i also want this moped running for the north run this year.
gonna keep it as a show bike as my pearants have finaly given in to me getting a 125 so im saveing for that to :/ alot of money

so im hopeing to have this moped running and restored by the end of june all help is appreciated.

thanks
lonie

[Robby]

How well did you clean the carb? Every jet and needle out, every tiny little passageway cleared out, accelerator pump out and cleaned? Followed by a rebuild to factory settings, including the mixture screw and float height.

Or did you just blow down it and not even take the float bowl off?

[lonie]

list of what i did:
unbolted from inlet manifold
removed airfilter
removed throttle cable slide
unscrewed thefloat bowl
removed what i think is teh mixture screw? (its a brass screw that goes into a slot on the throttle slide?)
removed the main jet and float (non adjustable)
tthen i sprayed the whole thing over with WD-40 (ran out of carb cleaner )
left some wd-40 sat in the float bowl whilst i blasted every passageway i could find with comressed air
emptied WD-40 from the bowl and blasted with compressed air
sprayed and blasted the jet and looded through to check for blokages
reassembled teh carb and put in the mixture screw? to the position it was in before i took it out

i dont know what a accelerator pump looks like but the carb just looks like a normal carb to me i will post up piccyss tmorow

also i noticed on the side of the carb where the inlet manifold is meant to be there is no O-ring between the gasket and carb eavan though there is a space for one on the carb could this be the source of my problem?

thanks
lonie