Re: Moroni MO2 spark issues

Nothing you can pass your fingernail over and feel much? Just buy a new stock piston and rings and wrist pin bearing, after making sure it's standard bore.

OR if piston is okay, ring grooves not damaged, piston not scarred, just new rings, again after checking the bore.

Oh, and I run a 26T on the rear. 30T will pull hills better but cost you higher speed. (edited)

Re: Moroni MO2 spark issues

So that broken ring piece is a big deal then, what about the cylinder wear? The head looks/feels good. I'm also gonna pull the clutch cover and inspect that and my beatnik clutch cable gnarp.

Re: Moroni MO2 spark issues

I'd clean everything and make it all pretty .

I'd remove the broken ring . Clean that landing , so a ring can move in it .

Move the lower ring to the top landing .

Put everything back together and run it .

Re: Moroni MO2 spark issues

> P D Wrote:

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

> I'd clean everything and make it all pretty .

>

> I'd remove the broken ring . Clean that landing , so a ring can move in

> it .

>

> Move the lower ring to the top landing .

>

> Put everything back together and run it .

At least figure out what size and if those rings are available. Attempt to do it right for fucks sake before throwing in the towel. (edited)

Re: Moroni MO2 spark issues

> live ɘvil Wrote:

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

> At least figure out what size and if those rings are available. Attempt

> to do it right for fucks sake before throwing in the towel.

That^ . Measure the piston . Measure the ring thickness .

Buy the next size over rings , if you go that route , and size those rings to the cylinder and piston landing .

If you go new rings , be sure to hone the cylinder .

Do not hone it if you're going to run the old single ring .

Re: Moroni MO2 spark issues

Had a quick 2nd or 3rd look before work and here's where I'm at...Piston is in real good shape, 1 ring broke, bore is super smooth, cylinder could use a hone. Attaching an expert level diagram of piston/ring measurements. :) Should have a new pipe in a couple days, thinking I'll clean this dirty bird, change all gaskets and get new rings. You guys are saying it's fine to just run one? Put it all back together, inspect clutch engagement, o ring/shim the sha, maybe upjet and open up the airbox and see where my top speed lies. This was supposed to be my budget ped and a learning experience and so far it's been exactly that. Thanks for all the help!

Re: Moroni MO2 spark issues

...

20200229_124403.jpg

Re: Moroni MO2 spark issues

No, run both rings brand new after lightly honing that cylinder. 2-stone brake hone is fine, with kerosene lubing it.

Re: Moroni MO2 spark issues

2 or 3 years ago , I broke the top ring of my FA50 . I simply moved the bottom ring into the top position and put everything back together . Been running fine since .

Starts first or second kick , does 30+ all day long .

I have been hearing a slight piston slap , lately . I'm not the least bit worried . I'll run it .

Re: Moroni MO2 spark issues

If I'm gonna change one I'll change both but cool to know it's possible. Got my jammy slip on today, ordering gaskets and rings. Will probably be back for advice on ring gap. Oh and the ring landings are smooth/clean.

Re: Moroni MO2 spark issues

> BBD 83 Wrote:

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

> If I'm gonna change one I'll change both but cool to know it's possible.

> Got my jammy slip on today, ordering gaskets and rings. Will probably be

> back for advice on ring gap. Oh and the ring landings are smooth/clean.

You said "budget build" .

I'd bet your bike that you can't tell the difference between what I suggest and what you think you want to do .

Cut your own gaskets .

Figure out your own ring gap . https://mopedarmy.com/wiki/Ring_gap

Re: Moroni MO2 spark issues

Sounds like P D needs a nap. I paid 150 for the ped so it is a budget build and if you get off on being a dick on a moped forum go do it on someone elses thread. You're literally the reason people hate this forum.

Re: Moroni MO2 spark issues

Exactly what did I say that even seems dickish ?

My quoting you ?

Or , maybe it was me sharing experience .

Or , could it be my suggestion to save even more money ?

Oh , I bet it was my suggestion to do a little research . ;)

Re: Moroni MO2 spark issues

Don't hate on PD, BBD83, he's actually one of the good guys here. He's a very helpful guy on here. His suggestion works, I just don't repair that way unless I'd have to.

Matter of fact, before I learned about kitting, I bought a new hi-compression(dome- topped) piston with rings at Handy Bikes for my M1 Sebring.

Chris at MopedWarehouse then got me set up with a 60cc kit and exhaust and 70cc kit and exhaust.

Re: Moroni MO2 spark issues

Figure out why it broke a ring or it might do it again. Do the port windows need chamfered? Check ring end gap before assembly. Oil everything up when putting it together. (edited)

Re: Moroni MO2 spark issues

> P D Wrote:

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

> 2 or 3 years ago , I broke the top ring of my FA50 . I simply moved the

> bottom ring into the top position and put everything back together .

> Been running fine since .

>

> Starts first or second kick , does 30+ all day long .

>

> I have been hearing a slight piston slap , lately . I'm not the least

> bit worried . I'll run it .

You get 30+ on a Fa-50?!? Impressive, you a light guy? I've ridden 2, 28 tops..but I weigh between 215-220 depending on my pizza intake that week. :) I need to get back on a bicycle to get my mopeds faster! :) I would not have done what you did, I keep stuff as the engineers designed it, 'cuz, well, I'm NOT an engineer! But neat to know it works. I would ride it until it expires, parts are avail and cheap. Like me! ;)

Re: Moroni MO2 spark issues

> P D Wrote:

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

> 2 or 3 years ago , I broke the top ring of my FA50 . I simply moved the

> bottom ring into the top position and put everything back together .

> Been running fine since .

>

> Starts first or second kick , does 30+ all day long .

>

> I have been hearing a slight piston slap , lately . I'm not the least

> bit worried . I'll run it .

Thats good for temporary or for racing. One ring does produce less friction.

Re: Moroni MO2 spark issues

> Stephen Keller Wrote:

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

> > P D Wrote:

>

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

>

> > 2 or 3 years ago , I broke the top ring of my FA50 . I simply moved

> the

>

> > bottom ring into the top position and put everything back together .

>

> > Been running fine since .

>

> >

>

> > Starts first or second kick , does 30+ all day long .

>

> >

>

> > I have been hearing a slight piston slap , lately . I'm not the least

>

> > bit worried . I'll run it .

>

> You get 30+ on a Fa-50?!? Impressive, you a light guy? I've ridden 2, 28

> tops..but I weigh between 215-220 depending on my pizza intake that

> week. :) I need to get back on a bicycle to get my mopeds faster! :) I

> would not have done what you did, I keep stuff as the engineers designed

> it, 'cuz, well, I'm NOT an engineer! But neat to know it works. I would

> ride it until it expires, parts are avail and cheap. Like me! ;)

Re: Moroni MO2 spark issues

all i hear is whah, whah, whah. you are literally being spoonfed, open up dont cry and eat it.

Re: Moroni MO2 spark issues

> Stephen Keller Wrote:

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

> You get 30+ on a Fa-50?!? Impressive, you a light guy? I've ridden 2, 28

> tops..but I weigh between 215-220 depending on my pizza intake that

> week. :) I need to get back on a bicycle to get my mopeds faster! :) I

> would not have done what you did, I keep stuff as the engineers designed

> it, 'cuz, well, I'm NOT an engineer! But neat to know it works. I would

> ride it until it expires, parts are avail and cheap. Like me! ;)

I took a ride yesterday afternoon . A touch under 10 miles . Until the motor got really warmed up , it would hold at about 27 - 28 on the flat and about 25 going uphill .

Once toasty , it was 30+ on mostly flat . A little stretch of slight downgrade put me about 35 .

I do notice that air temps and I believe humidity can make a difference . Cooler temps she likes to go faster . More oxygen per cubic foot ...

As for weight , I'm 190 - 195 .

I ride upright . I have tried tucking , but , that doesn't seem to do much good .

Re: Moroni MO2 spark issues

...reading up on ring gap and port windows. I'll stick to wiki for awhile. Thanks Don I'll check out handybikes and moped warehouse. (edited)

Re: Moroni MO2 spark issues

> BBD 83 Wrote:

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

> ...reading up on ring gap and port windows. I'll stick to wiki for

> awhile. Thanks Don I'll check out handybikes and moped warehouse.

Did you notice the position of the broken part of the ring in relationship to the port openings in the cylinder when you first took it apart?

Re: Moroni MO2 spark issues

> BBD 83 Wrote:

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

> ...reading up on ring gap and port windows. I'll stick to wiki for

> awhile. Thanks Don I'll check out handybikes and moped warehouse.

No, that was in the past, and I don't think either shop can help you out.

Re: Moroni MO2 spark issues

Ya, quickly found that after searching and no evil I wasn't knowledgeable enough to be aware of that.

Re: Moroni MO2 spark issues

Those port openings do need chamfered. Chop, chop

Screenshot_2020-02-29-23-50-51.png

(edited)

Re: Moroni MO2 spark issues

> live ɘvil Wrote:

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

> Thats good for temporary or for racing.

You may be right . I ride a lot of country roads at WOT , so that might be kinda close to racing . LOL

Re: Moroni MO2 spark issues

> live ɘvil Wrote:

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

> Those port openings do need chamfered. Chop, chop

> >

That's not the best pic , but , agreed , they do seem a bit 'ragged' .

Re: Moroni MO2 spark issues

As much as I don't wanna discuss the Morini again I have to update ya'll on this and get some feedback. I took a break from it for awhile and worked on my motorcycles, now that those are ready for summer I came back to it. New rings (just ran top ring) saved the other for a spare, new base gasket, light hone, head gasket, cleaned everything in the process, shimmed the intake and put an o-ring in the stupid carb. Before it went a whopping 18mph, after all that it did 20-21. I was running just the stock header and today I put the jammy muffler on. It was EVEN SLOWER with a proper exhaust. Officially my least favorite moped EVER. Didn't even have enough power to shift to 2nd and before it didn't know when to even try since power was so off. Oh I also drilled a hole in the stock 'airbox' and it ran even more shit. My head is on carb, maybe float needle is bad, giving way to much fuel. I did re-clean it. Thoughts??

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