peugeot speedfight 100 starting issues

ok... bit of a newbie, so here goes...
while using start button, fan spins, but doesn't bite... sparks every time
oil pump isn't sending oil to the engine, so replacement on order (hopefully arriving tomorrow)
new piston and rings on order, as original heavily marked and full of crap!
already replaced CDI, coil and HT lead. other parts on order: starter motor and starter relay
anyone have any ideas why she ain't kicking?

 

those rings look sort of melted on and the piston looks heavily scored ? do the rings move ?
also how long have you had the scoot, and has it started before ?

 

order a new small end bearing as well. a new gudgeon pin should come with the piston

 

looks like you will need to sand the barrel as well, could you upload a pic. the burn marks down the side of the piston is where the burnt fuel has been going. and with exhaust gasses mixing with the incoming fuel/air mix and the lack of compression means its a no go. oil pump not working is obviously why the seizure happened.

 

it will run again. I had broken rings a month ago, engine just died. so same idea. It would be a good idea to get a top end gasket kit as well seen as you have stripped it down. but with the marks on the gudgeon pin I think the small end bearing will be worn, and pretty rough, thats if it still exists.

Give the crankshaft a soak in 2 stroke oil while your waiting for parts to arrive, you will need to wash out the crankshaft and bottom end with a heavy mix of 2 stroke and petrol to get any small pieces of metal shrapnel out and get things as clean and lubricated as possible before reassembling.

glad to help as is anyone here

 

had scooter for 6 months (had been left outside for 2 years by previous member...) it worked on a daily basis until the breakdown 2 weeks ago. piston has been replaced, oil pump has also been replaced, so has starter relay... starter motor on order... can't afford any more parts just yet!

 

Blank of the oil pump and dump oil direct into the tank. that way there is no chance of running lean.

the Piston : if you look the underside of the piston is black thats where its burnt underside a lotta heat has gotten under the piston and started to burn and carbon up. the side skirts of the piston show what we call blowback, this is what happens when the rings start to fail, the create less of a seal and that hot combustion gas then seeps down the side back into the crank case heating up the motor even more that escape of gas also creates hotspots in the piston crown where the gudgen pin is and the little end bearing , this can cause the gudgeon pin to seize.

its a classic sign of a bust oil pump and a lean senario where the bike has overheated to a point the rings have failed and the piston has started to become soft allowing rings to stick. this has caused a huge drop in compression and no amount of fuel - air and oil with a spark will ignite and if it does its only withing a min the bike will superheat and stall out due to the lean conditions.

 

so, how can i get the beast running again???

 

just keep doing as your doing, a complete top end rebuild, with all new gaskets and piston kit,

have you rebuilt the top end ? looking at the blue colouring on the gudgeon pin its seized and skidded on the small end bearing when overheated and expanded so I don't think either it, or the small end bearing would be very efficient for long, they may move freely for now but they will be different when hot if any of them has went slightly egg shape with the seizure.

also thinking your old starter might be ok, test it straight to the battery to see if it works.

 

as CGC

test the starter motor direct to a battery, if it spins up all is good no need to replace it, only keep it on the battery for a few seconds.

so first off get a very clean rag pop that into the space around the bottom of the conrod and flywheel in motor it will stop anything that gets in there, ie circlips from gudeon pin etc ect.

run a ting bit of twostroke oil onto your finger and rub that into the upper small end hole in conrod , take the small end bearing and put a tiny drizzle of twostroke oil onto that and run it around so its all nice and oiled up, slip it into the small end hole in conrod. take piston and insert the gudeon pin into it a tiny bit so you can slide the piston over the conrod top and get the gudeon pin into the piston fully its gonna silde into the center of the small end bearing hence why we lube it up.

fit piston rings to piston making sure you fit them in the right order , now you gonna take that barrel and get your finger full of oil spread it around the inside of the cyclinder to coat the side walls dont worry its gonna burn away in the end but dont go crazy just get some on finger/fingers and spread that sucker around, now slide on the bottom gasket and now slip on the cylinder DO NOT force it you should be able to slip it on due to the champer in the bottom of the barrel. get it fully seated down onto that bottom gasket.

nest is the head gasket fit that to top of cylinder and slip on the head, then take the four bolts/nuts and screw them on finger tight. get your torque wrench and set it to the correct torque for the top end head nuts, torque them down nice and snug

Jobs done, small end - piston and cylinder is installed. now its time to hook up the fuel and kickstart it, YES KICKSTART, dont worry about the starter motor just yet we need to get that bike running, use a new plug and start it DO NOT GRANNY IT ON RPM .... just tickle the throttle a tad and let it idle, then its gear up time and out for a ride dont be going balls to the wall smooth rpm transitions through the range no hard on the throttle wide open if your gonna open the throttle fully a few seconds max thats it.

do that for like 200-300 mile and then its worn in after that you can hammer it wide open long runs, but keep an eye on engine temp if it smells overly hot cool down , check plug for colouration wants to be a chocolate brown

 

the piston rings might have a stamped mark on them, like a letter or something similar. the mark goes to the top. theres a really good you tube video on putting rings on, they are brittle if bent the wrong way. (can't post a link here)

the piston will have an arrow on it, it points towards the exhaust port.

always really handy to put one of the circlips which hold the gudgeon pin in place on first.
work out which would be the most awkward when the piston is in place.
I am a fully paid up member of the piston circlip haters club lol.
use the old gudgeon pin to tap it into place when you have it close.

 

let us know how things are going, would really like to hear when its running. or any advances you make on it.

 

ok, first things first... thanks guys for all the info so far, been a great help!
new gaskets, cleaned carb (again), replaiced piston (can't afford new cylinder yet), using premix instead of oil pump, replaced starter motor and relay... finally got her going again!
only trouble now, after a few minutes of riding (not thrashing!!!) engine cuts out... starts up again straight away, usually....
next??????

 

Taken for a test ride... massively overheating!!

 

good to hear its running. yeah keep those revs down, it probably will want to overheat for about 20 miles, and if it does, just stop and start. Just make sure you are getting 2 stroke through the engine, and take it easy. I think you might have a problem with fuel supply but can't be certain. because it sounds like you are using the fuel in the carb and its not replenishing from the tank quick enough to keep it going. (a problem I had myself with moisture affecting the float needle in the carb) either that or there is maybe some kind of overheat protection somewhere but I am not familiar with peugeot. it might even take just a while for everything to start working again, as it has been idle for a while.

on the oil pump issue I know the suzuki I have uses a CCI system where you have to use the oil pump, as it has a feed pipe that lubricates the crankshaft. without this feed the crankshaft bearing doesn't get the lubrication it is supposed to get. Peugeot is possibly a different system, but wouldn't like to see you bypass a needed oil supply.

 

still using oil pump (although no oil is going through to the carb) to lubricate the crankshaft. using premix to go through to the engine