Help identify this new clicky sound coming from my Grande

Clicky clicky sound is coming from the front end of my 1980 Grande. I'm pretty sure it is the piston rings but it could be something else. The sound was there yesterday and today its gone. I rode this all summer without any issues. It rides okay still like this but i don't want to ride too much with that sound.

The set up is Polini variator, olympia 43mm 64cc kit, stock grande cylinder head, Proma pipe, 13/13 dellorto carb, Molossi high flow filter, new tires....

here is the sound you can watch the video :

exportmopedarmypic21of1.jpg

Re: Help identify this new clicky sound coming from my Grande

Tear it apart and find out what the problem is .

Re: Help identify this new clicky sound coming from my Grande

Dirty30 Dillon /

Sounds like a snapped ring, or potential head gasket/decomp leak

Re: Help identify this new clicky sound coming from my Grande

You can do this. fire the motor and while running take your 11mm socket wrench and slowly like 1/2 turn at a time loosen the head nuts and see if the sound changes. Vespas dont have head gaskets so no worries there

Re: Help identify this new clicky sound coming from my Grande

Dirty30 Dillon /

> cheetahchrome . Wrote:

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

> You can do this. fire the motor and while running take your 11mm socket

> wrench and slowly like 1/2 turn at a time loosen the head nuts and see

> if the sound changes. Vespas dont have head gaskets so no worries there

Olympia kits do.

Re: Help identify this new clicky sound coming from my Grande

That's cool seeing a 1980 Vespa. That was my first moped back in 1986 I was 14 and had a moped permit.

Re: Help identify this new clicky sound coming from my Grande

But how does it ride? Does it feel different?

Re: Help identify this new clicky sound coming from my Grande

I second cheeta

Re: Help identify this new clicky sound coming from my Grande

olympia43mmpistonmarks.jpg

Thanks for the suggestion Cheeta, i appreciate anybody that has knowledge about this stuff cuz i love this stuff.

I finally took off the head and base jug to get a look at the piston and cylinder today and the piston rings are intact and everything seems pretty clean and nice EXcept the "blow by " marks on the piston body.

There are 4 blow by marks on the piston body....but the cylinder walls seem very nice and smooth. Tomorrow i will take the piston off completely to see more.

Re: Help identify this new clicky sound coming from my Grande

Dirty30 Dillon /

That's not blowby, that's soft seize.

Re: Help identify this new clicky sound coming from my Grande

Yeah blowby doesn't smear metal like that. Your too lean bro. And clean that smear up.

Sounds kinda like your Piston might be kissing the head just barely. Lookey for a mark.

It could also just be the kit, I had a Puch kstar that sounded HORRIBLE. But it was these the cheap casting ringing

Re: Help identify this new clicky sound coming from my Grande

Agreed . Looks like soft seize to me .

The dark coloration on the sides of the piston is blowby , not the smear .

Take any high spots off those smears with a bit of sand paper or flat file .

Clean the ring landings while you have the piston in hand .

Replace the rings and piston .

Check for any sharp edges in the cylinder . All should be chamfered .

Post a pic of the inside of the head .

Re: Help identify this new clicky sound coming from my Grande

Dirty30 Dillon /

Honestly, given the 4-corner tag, and the sudden clicking against the head, I am going to guess that you toasted your rod bearing and the extra play is causing the piston to kiss the head.

Check head and piston crown for tapping signs, and also your rod bearings for in and out play.

Re: Help identify this new clicky sound coming from my Grande

There are no marks at all in the head or piston indicating piston slap. There is no play in and out on the rod, only slight play side to side of the rod.

The piston however is pretty stiff when I rotate it up and down so I need to look at the brass bushing it has.

Re: Help identify this new clicky sound coming from my Grande

Did you slowly loosen the headbolts while it was running as directed?

Re: Help identify this new clicky sound coming from my Grande

I was going to do that but I went to start it the next day and it wasn't making the noise. It comes and goes so I just drove right into take a look and so far I'm having trouble pushing the pin out of the piston. the piston is a little stiff going up and down and the marks on the sides are all over so.... Yeah I will update when I get the piston off. Cheers!

Re: Help identify this new clicky sound coming from my Grande

Wow Piston is stiff...my complements to Dillon for staying previously what it could be...as I recall the width of the needle bearing housing on the conrod to piston can have wide variance. Perhaps yours is a bit too wide. Whech out what your specific kit and piston calls for. If u remove it put in new clips.

Re: Help identify this new clicky sound coming from my Grande

The 12mm wrist pin will not move more then 2mm so I'm guna have to borrow a large clamp tool from my dad and just press it out with alot of pressure and just scrap the piston probably. I'm changing that little bronze bushing to a needle bearing if I ever get it the freekin pin out.

Re: Help identify this new clicky sound coming from my Grande

Overpriced Parts /

> Micah Shafer Wrote:

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

> The 12mm wrist pin will not move more then 2mm so I'm guna have to

> borrow a large clamp tool from my dad and just press it out with alot of

> pressure and just scrap the piston probably. I'm changing that little

> bronze bushing to a needle bearing if I ever get it the freekin pin out.

Most times you can’t put a needle bearing where a bushing goes because size is different, you need to a buy a New needle bearing crank

Re: Help identify this new clicky sound coming from my Grande

So stock crank?

Re: Help identify this new clicky sound coming from my Grande

Yeah I was just looking at those sizes and the new needle bearing would fit the 12mm wrist pin fine BUT I wasnt sure about the rod end size hole and yeah.. that's okay I can hopefully just get a new bronze or brass whatever bushing again.

Re: Help identify this new clicky sound coming from my Grande

I'm sure you can get the bronze bushing replaced if you could find a crankshaft specialist and probably going to have to take the crank out of the case to get that done so while you're at it why don't you just go get yourself a new crank You can get an anticipator or or a standard if you just get the anticipato crank and new bearings and rebuild the case and if that's your problem your click will be gone I didn't realize that you just put the kit on a on rebuild case which is fine if everything there is perfect already

Re: Help identify this new clicky sound coming from my Grande

Im not sure I follow you. I'm just guna end up buying the bushing from treats I mean they sell those. I'm trying not to replace the crank but if I have to I will. I can even go back to my original 49cc Vespa piston and cylinder at this point. It ran good when I started this project it still went fast but that sound clicking would come back and scared me. I know I seized once or twice at the start of slowly breaking in the new kit a year ago. Cranks in good shape I think I got the wrist pin about half way out now and it's just stubborn as hell. I want to just hit it with a hammer but I can't lol.

Re: Help identify this new clicky sound coming from my Grande

Put engine in the freezer tonight if off the moped. In am heat con rod with a heat gun ..then tap out the con rod then use the con rod off the stock jug. There should be an oiler hole , make sure it's patent.

Re: Help identify this new clicky sound coming from my Grande

Overpriced Parts /

> Micah Shafer Wrote:

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

> Im not sure I follow you. I'm just guna end up buying the bushing from

> treats I mean they sell those. I'm trying not to replace the crank but

> if I have to I will. I can even go back to my original 49cc Vespa piston

> and cylinder at this point. It ran good when I started this project it

> still went fast but that sound clicking would come back and scared me. I

> know I seized once or twice at the start of slowly breaking in the new

> kit a year ago. Cranks in good shape I think I got the wrist pin about

> half way out now and it's just stubborn as hell. I want to just hit it

> with a hammer but I can't lol.

New bushing needs to be pressed in then precision reamed to fit with reaming tools or will have the same problem again, I’d plan on a new crank unless you have the tools and experience

Re: Help identify this new clicky sound coming from my Grande

Did you slowly loosen the headbolts while it was running as directed?

Re: Help identify this new clicky sound coming from my Grande

Finally got the wrist pin out with a c-clamp vice and two perfectly sized sockets and 4 hands Total haha. The bushing came out pretty easily with a little help from the perfect size socket again and some pressure leaving the crank in pretty darn good shape I am surprised. The bushing was slightly burned/friction rubbed to the wrist pin making it a tight fit so the piston would nock up and down but would re-lubricate itself just enough to run.

IMG_20200905_172206353.jpg

Re: Help identify this new clicky sound coming from my Grande

From the start with that 43 Olympia kit I should have check the gap on the rings with the new cylinder it came with, I thought since the rings were new and already installed on the piston when it came to me it would be perfect. We checked the gap after everything was apart and it's non existent. There is no gap, they touch inside the cylinder, if you just go to measure with a feeler you can't. My dad the mechanic for ford looked at that and was like hmmm Lol

Re: Help identify this new clicky sound coming from my Grande

Dirty30 Dillon /

The rings are supposed to touch the cylinder walls, that's not what a ring gap is.

Re: Help identify this new clicky sound coming from my Grande

No no the rings themselves touch dude

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