perfect first 1/2 mile. then sputters

Hey gagn.. I have a light problem.. My moped 1980 peugeot sp 102

is having some problems. It run great I mean doesn't miss a lick untiol it gets good and warm. Im tlaking around the block 10 times.. or a 1/2 mile then it sorta almost chokes out... you can goose the throtal a bunch to keep it kinda running.. Holding the throtal will just get a surgeing affect.. I Don't really know what is up with it. It's not insanly terrible but it is wrong. Where do I start. Mixture.. air idel screw? I dunno..

Hey ps. Are the tires suppose to spinn so fsat on idel when you let it off the kick stand while it uns t actualy sqeexks the tires... like UrrT sound?

Thanks.

Re: perfect first 1/2 mile. then sputters

You need to adjust your idle down a little, using the idle screw on your carb. It should idle strong, without making your rear tire spin so much. A little spin is okay, but it shouldn't be a constant spin. Sounds like your carb bowl might be fludding or something. Take the bowl off of your carb and look at the jet to make sure there isn't any crap in there. Spray it out with some compressed air. While your in there, clean your carb with some carb cleaner.

chris

Re: perfect first 1/2 mile. then sputters

Hi, Being that it only does it when road constantly, sounds like a fuel filter stopping up, in tank, or carb,,, clean or replace both. Doug D.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Duck,

You have two opposing answers here, one vote for too rich and one for too lean.

I am going to stay out of it until you pull your plug and tell us what color it is. : )

Ron

Re: perfect first 1/2 mile. then sputters

Yeah, a plug chop is in order here. :) Find out if it's too dark brown, or too white, then let us know.

Re: perfect first 1/2 mile. then sputters

I did a plug chop last night just before i had posted.. I compared it to the spark plug chart and found mine didn't really resemble any of them.

My plug was very very dark black. However it was dry as a bone

I have a gurtner carb and don't even know what screw is for what.. it is the same as a motobecane.

I took it out agiantonightand it worked pretty good during start up but still wasn't 100% after 5minutes of riding it was aweful.. i dont know how it stayed running.

The carb was nasty previous to me ever getting it running and i completly cleaned it.. alot of muck in the filter.. and the gas tank had no cap on it and was rusty on the inside. I put a fresh tank of clean gas in it before it started to act up but this isn't the first fresh can of gas. (thinks i hsould go clean the filter agian?)

anddo Ineed a new plug or just clean the old one? its maybe had 6 milesput on it.. does a big fat blue spark even though being dirty

Re: perfect first 1/2 mile. then sputters

Duck if it is really dark black, you are running way too rich! Check your jet again dude. If it is blocked you will flood your bowl, hence the problems you are having. Do you have a inline filter from your petcock to your carb? If not, get one. It doesn't take much to clog up a jet, and if you don't have a filter, you can clean it, and 5 minutes later, your jet could get some crap in it. Also, you said that your tank was really rusty. Did you attempt to remove all of the rust?

Chris

Re: perfect first 1/2 mile. then sputters

No not really.. most of the rust looked like surface type rust.. not scale or flakey type rust.

Also I do not have a fuel petcock... I tok a hose fitting and screwed it in.. then ran a hose straight to the carb. I guessing a filter is due... I just cant find onme that is reuseable.. I odn't see paying dollars every other day when it gets clogged up.

.. I have been using like 2 onces of oil per gallon. Is this right?

Re: perfect first 1/2 mile. then sputters

Duck,I'll bet you're 4-stroking.Increase your air supply to the carb.Tell me what that does.O.K.?My Sebring with the Minarelli did that and drilling 2 more 5/16 or so holes in the airbox straightened it out.The only other thing I've seen do that is too wide a points gap.

Re: Crank seal(s)

I'm not familiar with Peugeot in partcular, but you can do everything to the carb til hell freezes over and it won't do a thing if the crankshaft seals are bad. It's a fact with two strokes, particularly old ones

When the engine warms up is when they'll leak vacuum, making the engine stop. Before messing with the carb, take the ped out like you have been doing and when it starts to die out, close the choke gradually. If this returns the engine to the way it was running before, it's a vacuum leak at the seals.

The fact that the engine runs well til it warms up is the classic symptom of this condition.

Maybe the Peugeot technicians here can advise about what it takes to replace the seals.

Jim

Re: perfect first 1/2 mile. then sputters

Duck,how `ya doin'?I forgot to say about the oil ratio............use at least 2.5 oz. and preferably 3oz. to the gallon.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Duck,

Did your ped just start doing this?

Chris is right about you running too rich so you can ignore Jim's seal idea, choking would just make it richer. I hope Chris is refering to the float needle jet being cruddy, this would cause rich runnning, so would a plugged air filter.

Don is right on the oil mix. 2.8 - 3 oz per gallon is good.

Give us some history on how it has been running.

Ron

Re: perfect first 1/2 mile. then sputters

Well it seems like the first few times it ran almost flawlessly but I didn't really ride it anywhere over 1/4 mile or say 5 minutes of constant driving.. I jsut got it to run last week or so. I did take the carberator totaly apart and soaked in profesional carberator bath.. so im sure none of the settings are correct.. I don't know how to set them.. I just turned the screws a few times.

Also.. Im instrested on this crank seal thing.. We took a seal off just behind the pedal arm? when I took them off to change the pedel and yes one is missing.

However that didn't really affect it before. Applying the choke doen'st make it better though.. makes it worse.

It's wierd... it sorta surges like umm bub ummmm bu ummmmmmmmmmmmbummmm bub mmm bub bub ummmm

hehe... also it doen'st do it as bad on a dirt bumpy road down hill if that helps any.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Duck,

Forget the pedal shaft seal as fer as running is concerned. The crankshaft seals maintain crankcase pressure for fuel transfer, if they were bad, you would be lean, not rich.

It really sounds like it is not getting enough air, or it is getting too much gas. Try testing it without the air cleaner and air box, just stay off the dirt roads while you do this.

Let us know how it goes.

Btw, did you poke anything through the main jet to clean it?

Ron

Re: perfect first 1/2 mile. then sputters

Duck,Jim C. was talking about engine crankcase seals,not any seals behind the pedals.But now that you say you don't know about the carb adjustment,I'll leave it to Ron or someone with probably a Gurtner carb to help you adjust it.Generally I try to start a small engine at 1&1/4 turns of the air-fuel screw.If it starts and runs I warm the engine to a good running temp....Then I hit the accelerator hard while I back it out a little more.AFTER it's good and warmed up and there's no choke on.I think you just may have the screw turned out too much.Just a guess!

Re: perfect first 1/2 mile. then sputters

Ron I'm not sure if you are familuar with gurtner carbs.. I'm not totaly but alot of people have siad take hte bowl off do this do that.. the bowl on a gurtner doens't come off.. And not to say your wrong but out of my sheer ignorance im going to say I think I saw the main jet and it was pretty much unacessable The moped is not running an air filter now becuase it was basicaly ash when I got it and it crumbled when I first cleaned the carberator.

Apon starting it last night it smoked pretty damn badly so I do think it is running rich.. but it didn't last long.(the smoke)

the surging is not something that seems like it is slowing down some it seems more like loss of power a few turns then a sudden power surge .... as I drive it worsens to almost I would describe it almost the motor turning 3 times and it only providing power once then turing 2 or 3 more times.. but it is really random.. sometimes it will get strong and almost go up to full speed while missing every now and then.. only to bog down and serge agian.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Don,

Very few peds have an idle mixture screw and even if they did, they make no difference at full throttle.

Ron

Re: perfect first 1/2 mile. then sputters

I'll probly go mess with it tommorrow. It is raining abit today but was in the 80's yesturday hopefully it will be that way agian tommorrow.

(rubs it in as best he can)

And what do I have to do to become a member? I signed up for the registration and moped directory.. now what ? heheh..

(ps My shop teacher now owns a honda express moped/scooter thingy)

Re: perfect first 1/2 mile. then sputters

Ron I can turn the little screw and it makes the tires speed up and slow down.. it was turned up screwed all the way in to make the tires turn faster for more speed (I was directed by a freind) it makes the tires spin faster when i screw it inwards and slower when outwards while it is on the stand.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Duck,

Duck, if you can't take the bowl off, take the top off, does the same thing.

If your carb is like mine, there is a brass hex screw in the bottom of the carb directly below the slide. When you unscrew this, it should have a narrowed part about half way down with a hole drilled through it. This is how gas gets into it from the float bowl. In the top is a tiny hole drilled through to the cross hole. This tiny hole is the main jet but you have to repalce the whole screw to change it.

Any chance you poked wire through this little hole?

Ron

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Duck,

That is just for idle speed, it should be turned down until the tire stops, if the engine will run ok at that speed.

The screw just holds the slide up, same as turning the throttle.

Ron

Re: perfect first 1/2 mile. then sputters

ah okay cool thanks.. hmm... now I have no clue what to do.. hehehe.. I will just take of fthe carberator and mak sure it is neatly cleaned tommorrow.

I'll post any results.. thanks very much everyone for your replies.

I learned alot tonight.. thanks.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

That sounds like a plan.

Re: perfect first 1/2 mile. then sputters

I'm referring to a main jet adjusting screw,Ron.Yeah,I know I called it a fuel-air screw.It actually is an adjustment of fuel to air because air is fixed volume.I'd say he's got his main jet adjusting screw out of wack,IF he has one.

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Don,

Only lawn mowers and chain saws have main jet mixture adjustments. Pity though, it would avoid buying all these different size jets. : )

Ron

Re: perfect first 1/2 mile. then sputters

I'm thinking I saw some on `peds,Ron.Seems like maybe Sachs or Puch, but I can't be sure.Could be wrong though.(:>)

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Don,

I have never seen a high speed adjustment on anything other than a Briggs and Stratton style engine or a weed whip/chain saw style.

Regular motorcycles and some peds have an idle mixture adjustment but changing high speed mixture requires a main jet change.

Ron

Re: perfect first 1/2 mile. then sputters

Ron.I will keep my eyes open and see if I can find where I thought I saw that.I have a good memory,it's just short! LOL!

Re: perfect first 1/2 mile. then sputters

Ron Brown /

Don,

Don, I regognize that promlem. I have altzheimers some of the time and sometimers all of the time, I think.... : )

Ron

Re: perfect first 1/2 mile. then sputters

Ha,ha,ha,ha,ha!That's pretty good Ron.

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