Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

So I have had this 70cc kit for something like two months now and haven’t really had too many problems with it until now. Just recently it started to fuck up it had no power at first then it just wouldn’t start at all. I tried everything until As a last ditch effort I put the original cylinder on it and sure enough it started right the fuck up no problems whatsoever. I assumed it could be the piston rings and I ordered some new ones because the gap was off. Now the gap is good so the piston rings are the way they should be. Now I tried starting it and nothing so I pushed it and got it going. At low speeds it almost dies and then once you get it up to speed it runs great until you stop and have to push it again to start. I know everything else is good so what is there left to do? I am tempted to just buy a new kit but ideally I could save my money and find the problem. I’m completely stuck atm.

Current setup Peugeot 104, simonini circuit pipe, delorto sha 15.15 carb, airsal 70cc kit, polini cylinder head, and a launch lever. The rest stock.

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Re: Peugeot 104/103 Airsal 70cc kit

Well if you put the stock cylinder back on and it ran perfect then your problem is the cylinder so forgot about all the other stuff.

How did you the check ring gap?

Crazy thought but it could electrical, same spark plug on both cylinders?(edited)

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

Is there anything I can do about the cylinder? Other than buy a new one? I checked the gap in the piston rings by putting it in the cylinder and measured with a blade measure idk the English word.

No I checked the spark and everything same plug everything the only thing I changed was the cylinder. I checked the timing and it was good. Also if I do have to resort to getting a new kit what are some good ones preferably around $150(edited)

Re: Peugeot 104/103 Airsal 70cc kit

> Carraig Butler Wrote:

> -------------------------------------------------------

> Is there anything I can do about the cylinder? Other than buy a new one?

> I checked the gap in the piston rings by putting it in the cylinder and

> measured with a blade measure idk the English word.

>

> No I checked the spark and everything same plug everything the only

> thing I changed was the cylinder. I checked the timing and it was good.

> Also if I do have to resort to getting a new kit what are some good ones

> preferably around $150

Slow down, how many miles you have on this kit? Two months of “riding” is not long especially with that set up for a worn out cylinder.

They call it a feeler gauge! What was the recorded measurement? Use the piston to square up the ring. ( measure multiple positions above the exhaust port)

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

The measurement was 0.2mm and I probably have maybe 150 miles on it which I agree isn’t much at all which is why I think it’s so strange. My grandpa helped me out with all the measurements because he has worked on loads of bikes in his years. But he did measure it properly. Could it be something to do with compression because it is pretty bad compared to the old cylinder I don’t have a gauge but it doesn’t take much force to turn over vs the og cylinder took quite a bit of force.

Re: Peugeot 104/103 Airsal 70cc kit

Piston to cylinder clearance off or major score of cylinder wall or ports of kitted cylinder f'ng with timing. Just a few things that come to mind.

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

Do you think that it could be that the crank case seal is bad and it’s not getting the fuel it needs and the old cylinder is working because it doesn’t require as much fuel?

Re: Peugeot 104/103 Airsal 70cc kit

> Carraig Butler Wrote:

> -------------------------------------------------------

> Do you think that it could be that the crank case seal is bad and it’s

> not getting the fuel it needs and the old cylinder is working because it

> doesn’t require as much fuel?

Nope , if you had a bad seal all the cylinders would pretty much act the same and just not run correctly.

Your cylinder is done it sounds like. Now before you go spending anymore money I was highly recommend some more reading. 150miles is not anything (even with a cheap chines eBay kit) you should be seeing Atleast 1,000miles ( piston ring swap at 500miles).

I’m usually one for hard brake ins

Re: Peugeot 104/103 Airsal 70cc kit

when its running check for air leaks, aee u using a head gasket.

Re: Peugeot 104/103 Airsal 70cc kit

Money on top end airleak.

Polini 70cc head right - not the 50cc one?

it has a decompression valve? check that it actually seals / isn't stuck open or failing / that it is installed properly with appropriate sealing washers, etc.

head/base gaskets intact and actually sealing?

do a leakdown test

do a compression test (which it sounds like you did i.e. turning it over by hand.)

spray the whole thing down with soapy water and get it spinning and watch for bubbles.

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

I will check for leaks all around and I might as well replace the crank seal since it’s like five bucks. By the way how well would a 50cc cylinder with an upgraded pipe pull away from a traffic light because I felt like I had to push it a bit just to be able accelerate. I assumed it was due to the lack of power with the 50cc cylinder but maybe it could be because of the seal. Idk I’ll replace it anyways and see how it goes.

Re: Peugeot 104/103 Airsal 70cc kit

did it pull better with the stock exhaust?

Maybe there is a restrictor washer in the header of your new pipe that you didn't remove

maybe your belt is loose and when you rev from a stop, it shifts the vario into high gear and slips the clutch

you can only do one of the crank seals without splitting the cases.

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

I don’t think it did but I can’t be sure I haven’t ridden much on the stock cylinder. And which seal can I replace without splitting? Clutch side or magneto side?

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

So I have just tested for leaks by using a tuba attached to the intake and putting the piston at top dead center and there are none. I am also very confident that the head and base gasket are not leaking. Nothing seems to be wrong! I am absolutely stuck. The one last thing I will try is sealing up the top port and try to start it because maybe I ported it wrong? Even though it ran perfectly after I ported it and only went down the shitter after like 30 more miles. So for today I’m done and i might just have to bite the bullet and get a new cylinder because as far as I know that’s what’s wrong. Here’s a photo of the cylinder if that helps.

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Re: Peugeot 104/103 Airsal 70cc kit

i don’t like that decompression! Show top of cylinder plz! I recommend plugging that hole

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

Rocco taco you are right!

I have just tested the 70cc head on the 50cc cylinder and absolutely nothing it would not start and compression was nearly nonexistent. I than tried the stick head which of course worked no problemo! Upon further inspection of the decomp valve it was chopped slightly allowing compression to escape into the exhaust which was why I didn’t suspect it at first since it didn’t leak visibly from the top. Here is a photo of the pin. Now I just need to work out a kill switch and I’ll be Good!

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Re: Peugeot 104/103 Airsal 70cc kit

plug 70cc head and update with matching kit(edited)

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

Will do

Re: Peugeot 104/103 Airsal 70cc kit

> Carraig Butler Wrote:

> -------------------------------------------------------

> So I have just tested for leaks by using a tuba attached to the intake

> and putting the piston at top dead center and there are none.

If you are going to take anything away from this process, it should be about diagnostic testing and results interpretation.

It seems like you did get some experience with diagnosing problems by swapping in known good components.

glad we could help!

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

It’s alive!

I plugged the decomp hole and despite being a bit hard to start it ran great! And compression is actually something now. Thanks for everyone helping out!

Re: Peugeot 104/103 Airsal 70cc kit

> Carraig Butler Wrote:

> -------------------------------------------------------

> It’s alive!

>

> I plugged the decomp hole and despite being a bit hard to start it ran

> great! And compression is actually something now. Thanks for everyone

> helping out!

Cool

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

Well fuck...

So the moped was running great and all and I was on my way to school I stayed in between 35 to no higher than 40mph aaand it seized up like really bad There are gashes in the cylinder that won’t go away by honing it out. And I have come to my consensus and I figured that I might want to invest in a more high quality kit since this one seemed to overheat a lot and overall just isn’t great. I’m running a 78 jet and on a 3% mix if anyone was wondering. But are there any good kits that will last me longer. Please lmk what you guys recommend.

Re: Peugeot 104/103 Airsal 70cc kit

It probably needed to be re jetted after you found the problem. That cylinder is pretty durable, it was just running too lean.

Re: Peugeot 104/103 Airsal 70cc kit

> Carraig Butler Wrote:

> -------------------------------------------------------

> Well fuck...

>

> So the moped was running great and all and I was on my way to school I

> stayed in between 35 to no higher than 40mph aaand it seized up like

> really bad There are gashes in the cylinder that won’t go away by honing

> it out. And I have come to my consensus and I figured that I might want

> to invest in a more high quality kit since this one seemed to overheat a

> lot and overall just isn’t great. I’m running a 78 jet and on a 3% mix

> if anyone was wondering. But are there any good kits that will last me

> longer. Please lmk what you guys recommend.

Temp gauge? After all that

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

I did re jett it was running a 68 with the 50cc the other reason I feel like I need a new cylinder is because everything so far with the kit seems to be off. For example the piston is supposed to be about 0.05 mm in between the cylinder but it would not slide through. Right now I am looking at the polini 70cc kit the cast iron one. What do you think?

Re: Peugeot 104/103 Airsal 70cc kit

Cast iron=superior in MY OPINION. get yourself a temp gauge as well.

How did it run if the Piston diddnt slide through? And yeah, I know you rejetted when you went to 70cc. What I'm saying is that you needed to do it again after plugging the decomp.

Post some pictures of the Piston and cyl wall. But yeah it's probably toast now...burnt kits make great ashtrays tho!

Re: Peugeot 104/103 Airsal 70cc kit

Polini cast iron is very slow. If you want a cast iron kit the dr is the best, malossi is pretty good too. Just don’t get the polini cast iron.

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

It doesn’t have to be cast iron I’m just looking for anything that is reliable as long as it’s not over $200 what do you recommend?

Re: Peugeot 104/103 Airsal 70cc kit

Reliability with kits is based on how well you tune it and how hard you ride it. Yeah I'm sure there's a few bad eggs but set up right they are all pretty good.

That being said everybody here has destroyed at least one...most have blown up alot!

it's FRENCH! it's gonna break over and over again man. Forever, all you can do is keep up on maintenance and hope you can fix it enough to get home.

Re: Peugeot 104/103 Airsal 70cc kit

Carraig Butler /

That is very well said. I did some light research ie first result on google and cast iron does apparently withstand heat better so I think I’ll go with a cast iron cylinder and for port matching sake I’ll probably end up getting the malossi. Here are some photos of the cylinder by the way. Also I did hone it out so it’s not as bad but the piston is toast.

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