Engine Siezed? Cylinder & Barrell scored

[speedfight]

As you may know from previous post I have had to have new cylinder and barrel fitted to my speedfight.

I am now not sure if the scoring on the cylinder or barrel was done prior to me purchasing my speedfight a few months ago.

I have notice that if I run my bike flat out on straight road it eventually looses power and stops. I then have to restart the bike and continue. Could this of cause the scoring on my cylinder and barrel

I have just been reading another forum and this guy has changed his exhaust and they are telling him to change his carb and rejet or he bike will seize.

I am totally green to scooter. Trying to learn for these forums as much as possible. Before I pick my bike up with new crankshaft, cylinder and barrel and start riding it. Do I need to rejet my engine or replace carb? I have changed my exhaust in the last month to a Doppler would this effect anything.

Or am I panicking too much Don’t want anything else to happen or go wrong as its cost too much already

If I do need to rejet my carb or replace it can anyone give me any guidance. Please help me! it would be so much appreciated. MY CARB IS STANDARD. Forgotten what is called beings with D
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Peugeot Speedfight 100cc (year 2000)
Polini Clutch, Malossi Multivar 2000 Variator
Malossi Kevlarf Belt, Doppler Exhaust

[Scotsman37]

Did you buy the scooter privately or through a dealer?

If you bought the scooter privately, then you're up shit creek without a paddle because the saying goes "Buyer Beware". Trading Standards will NOT help you there.

If it was a dealer did you not get a guarantee cover with it even if it was 2nd hand and was the scooter itself in extremely good condition when you originally purchased it from them?

How long was it before your scooter broke down since buying it ?

[cagiva gezzer]

[Dom_]

[speedfight]

What ! Not sure what you mean No im not pissing with you - What you trying to say please can you explain
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Peugeot Speedfight 100cc (year 2000)
Polini Clutch, Malossi Multivar 2000 Variator
Malossi Kevlarf Belt, Doppler Exhaust

[speedfight]

I have re read my first post and hope you have understood it correcly,


Point 1. The porblem with it cutting out at full throttle was happening before any work was done to the bike (no repairs)

Point 2. First Problem My kickstart jammed and damaged the grankshaft. so I had that replace the crankshaft by peugeot. While that was being done the engineer noticed. that there were markings ("Scoring" is that what its called) on the cylinder and barrell he said that he could put it all back together and I may be never ever have a problem, I decided while the engine was appart to have new cylinder and barrell fitted.

I have not yet got bike back, so not sure what it runs like.

My Oringinal Thoughts where

The cutting out of the bike was muck in the carb (new to scootering don't forget)

But now I ask the question have I caused the marks "Scoring" on the cylinder & Barrel by it cutting out, or may be these were already there from previous owners. (bought privately)

I needed some ones opinion.

Not taking the piss with you
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Peugeot Speedfight 100cc (year 2000)
Polini Clutch, Malossi Multivar 2000 Variator
Malossi Kevlarf Belt, Doppler Exhaust

[Scotsman37]

You didn't answer my questions;

A) Was it bought from a dealer or private seller

B) If a dealer then when was it bought and did you get a warranty cover with it ?

C) If it was under guarantee and was it taken back to the dealer before the warranty cover expired.


P.S. It was a very foolish thing to do by going continually at full throttle for long periods of time !

[speedfight]

I did answer your question

[cagiva gezzer]

Did it seize or did it cut out? There's a difference.

A seize would feel like your going up a hill, then the engine would stop suddenly.
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"because one stroke isnt enough and four strokes waste two"

[speedfight]

It just stops. Did not now that. Thanks , so I presume that it was most proberlydone before. What do you think cause it to stop then?
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Peugeot Speedfight 100cc (year 2000)
Polini Clutch, Malossi Multivar 2000 Variator
Malossi Kevlarf Belt, Doppler Exhaust

[mchaggis]

I can't understand why you guys are sat there taking the piss.

It sounds to me as if it's just constantly overheating and siezing up. He's changed the exhaust, presumably making it run lean and hence too hot. Piston expands too far and sticks in the bore. It will cause damage over time and eventually I should imagine, will junk the cylinder if not the piston itself. If the cylinder and piston are scored, then the chances are they will need to either be replaced, or just the piston+rings replaced and the barrel rebored.

I should think that you might want to see if it does it with the original exhaust back on to make sure that it is the new exhaust causing it. If it is, and you really want the new exhaust on, then you'll probably need to rejet the carburettor to alter the fuel-air mixture. I'm not sure whether its just a case of changing the needle height, or putting in a larger jet altogether, but it shouldn't be too difficult.

You can tell the burning conditions of the engine (too hot, fouling, too lean, spark plug wear, auto ignition, carbon deposits etc.) by taking the spark plug out and having a look at it.

Look here: https://www.dansmc.com/sparkplugs1.htm for more information, and compare the colour of your spark plug against this lot for reference.
https://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html


Having said all that and read your second post, I'll now have to ask you exactly what the problem is now. If the scooter is running well without any issues, then I'd just leave it be.
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I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[Kickstart]

Hi

Scoring is likely to be due to seizing up or a failed piston ring (there are other causes though). It can seize up if it runs lean, and if the bike is starved of fuel that is what will happen.

Check the filter to the carb from the fuel tank. If the fuel cannot get from the tank to the carb as quickly as you are using it then the bike will run lean and then stop.

If you play around with the exhaust then generally you do have to change the jets in the carb. Sorry, no idea what to change them to on yours, but generally go up several sizes. Running rich (too large a jet) will loose you power and increase fuel consumption, but is pretty safe, while running lean (too small a main jet) runs the risk of siezure.

Also probable that if there were just marks on the barrel and not on the piston then the problem was prior to you owning it and someone had just bodged it up with a new piston before selling it on.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[cagiva gezzer]

Not taking the piss, just having a chuckle.

I can't make out if its seizing or its an eletrical/fuel issue.

Does it feel like the back brake is being put on slightly then the note of the engine changes and then it all suddenly stops?

I had a bike with a iffy oil pump. It would seize all the time, but it was never too bad. Nip up, pull over. Start and go for another day or two.

If it was over heating from being too lean, it would do A LOT more damage and prob wouldn't start up again as it would suffer a 4-point seizure which would smear alu/nika - sil over the rings on each "corner" which would prevent the rings sealing against the bore.
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"because one stroke isnt enough and four strokes waste two"

[binge]

Is it air cooled or Liquid cooled?

When I had my speedfight 100cc A/C If I went flat out for too long it would cut out. after it did this about 4 times, it scored the barrel and lost compression.

Its called OVER HEATING

If its Liquid you should take more notice of your thermostat, if its going into the red, SLOW DOWN

Anyway, If it is overheating, then the problem lies with 2 things... Not geting enough 2T oil, OR the cooling system is not working.

Mine was aircooled, and there was a hole in my bottom end fan casing so it wasnt cooling sufficiently.

all you can do is ride it for a hour or so. Get it home and get the plug out to see what colour it is. If its a coffee brown colour then your oil / fuel / air mixture is ok. ALso you want a bit of bluey white smoke coming from your exhaust. If theres NO smoke then its time to worry

Thats all I can say really, When you have a bit of money, get it serviced. they should sort anything out which is fucked

[Dom_]

Yeah, what binge said.

When i go on ride outs i usually hold my bike flat out for long periods of time because i ride with bikes that are quicker than mine, lol. So i put a dribble of 2t in the tank, just for a bit of 'security'

[mchaggis]

What Binge meant to say was if it is liquid cooled.

Conventional air cooled engines have no thermostats and no fans, as they have no liquid coolant and no radiator.
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I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[speedfight]

THANKS GUYS FOR YOUR HELP!
Thats all I wanted a bit of info for a newbbie! Thanks Mchaggis for your comments too.

Hoprfully when I get my bike back I will do the Spark Plug Check and take it easy for a few trip until I get it right. Thank again Lads. Its appreciated
____________________
Peugeot Speedfight 100cc (year 2000)
Polini Clutch, Malossi Multivar 2000 Variator
Malossi Kevlarf Belt, Doppler Exhaust

[binge]