question on polini 70cc upgrade for my 2003 zuma

Matt Bellemere /

Jul 01, 2020 03:02PM

Good day, well kinda, getting better now that I found you all, I hope.

My son bought this from someone who had to kno wthis had problems and did not even offer some $ back to help fix it. this happened 2 hours after purchase :-(

I'm trying to get back on the road and reliable for him.

First off, yes or no, still thinking of sticking with stock (about the same price as far as i can tell?

If I use 70cc upgrade will the stock clutch work with that or will the clutch need an upgrade as well?

Last thing, for now, it appears as thought the case is "glued" together instead of a gasket...any thoughts on what to use when I put this thing back together?

I appreciate any advice on the above topics, almost ready to pull the trigger.

Pics below of the carnage

Thanks

Belle01

Re: question on polini 70cc upgrade for my 2003 zuma

P D /

pdcomm

Jul 01, 2020 03:13PM

You are working on scooter , not a moped .

This site is dedicated to vintage mopeds .

You would be better served by visiting a site like https://49ccscoot.proboards.com/ .

Re: question on polini 70cc upgrade for my 2003 zuma

Matt Bellemere /

belle01 OP

Jul 01, 2020 03:32PM

Man, had a good friend of mine that modifies these things tell me about this website knowing what I had, shame you are exclusive. I am sure they have a lot of similarities.

Re: question on polini 70cc upgrade for my 2003 zuma

Stephen Keller /

keller_stephen

Jul 01, 2020 03:32PM

Or scootdawg.com

Re: question on polini 70cc upgrade for my 2003 zuma

Stephen Keller /

keller_stephen

Jul 01, 2020 03:35PM

Our stuff is way older is all, I have a scooter I just broke and did not ask about repairing it here, as very few have what it is. Best of luck with repairs, Zuma's are very good scooters, there might even be dedicated sites where you could get more accurate information.

Re: question on polini 70cc upgrade for my 2003 zuma

Mike Boyd /

Go to branch

boyd

Jul 01, 2020 03:35PM

Holy crap that crank got fucked! I'd definitely check the oil pump and make sure you're getting 2 stroke oil to the cylinder. Looks like the big end bearings seized up on the conrod?

IMO the stock cylinder is best. If you get the 70cc you will want to adjust the cylinder head to match the squish band, and you will have to retune the carb (which you might need to do anyway if that crank and piston damage was caused by a lean condition.)

Re: question on polini 70cc upgrade for my 2003 zuma

operator error 696 420 /

carless

Jul 01, 2020 03:42PM

Yea no gasket, you have to use a solvent Gasket maker! Cranks are cheap for those engines.

The Zuma is pretty fast stock, I would imagine some heavy gains with a 70cc kit ( probably to much for daily use) A mild 50cc kit would make ur son happy until he is itching for more.

Scootertunning.cal is the best website! 2-day free shipping On orders Over $200!! Its really fast shipping

Re: question on polini 70cc upgrade for my 2003 zuma

Matt Bellemere /

belle01 OP

Jul 01, 2020 03:52PM

thanks for the advice, i will take it and run. Be back when I get that barn find.

Re: question on polini 70cc upgrade for my 2003 zuma

Joshua Dyer /

misterbean

Jul 02, 2020 05:58PM

I put a polini 70cc kit on a friend's Zuma. It was super easy and ran well with the stock and bigger jets. Top speed however stayed in the very low 40 mph range.

Re: question on polini 70cc upgrade for my 2003 zuma

operator error 696 420 /

carless

Jul 03, 2020 02:28PM

> Joshua Dyer Wrote:

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

> I put a polini 70cc kit on a friend's Zuma. It was super easy and ran

> well with the stock and bigger jets. Top speed however stayed in the

> very low 40 mph range.

Yea I have to upgrade your cvt or achieve higher rpms

Re: question on polini 70cc upgrade for my 2003 zuma

Dan Catalyst /

scuba_steve

Jul 12, 2020 11:15PM

I think some Zoomas have a minarelli, maybe thats why your friend said check here. Its a minarelli horizontal tho and just a differant animal than the minarelli vertical found on mopeds. Get a $40 ebay kit for that thing tho.

Re: question on polini 70cc upgrade for my 2003 zuma

operator error 696 420 /

carless

Jul 13, 2020 01:05AM

> Dan Catalyst Wrote:

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

> I think some Zoomas have a minarelli, maybe thats why your friend said

> check here. Its a minarelli horizontal tho and just a differant animal

> than the minarelli vertical found on mopeds. Get a $40 ebay kit for that

> thing tho.

Minarelli vertical was on scooter like the razz or jog riva. The vertical cvt version is actually a great platform and up for there with the horizontal.

Re: question on polini 70cc upgrade for my 2003 zuma

Jax Rhapsody /

jaxrhapsody

Jul 14, 2020 04:28AM

> Tweaker trash Wrote:

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

> Yea no gasket, you have to use a solvent Gasket maker! Cranks are cheap

> for those engines.

>

> The Zuma is pretty fast stock, I would imagine some heavy gains with a

> 70cc kit ( probably to much for daily use) A mild 50cc kit would make ur

> son happy until he is itching for more.

>

> Scootertunning.cal is the best website! 2-day free shipping On orders

> Over $200!! Its really fast shipping

The 2T are fast stock.

Re: question on polini 70cc upgrade for my 2003 zuma

Matt Bellemere /

belle01 OP

Jul 14, 2020 11:14AM

Thanks a lot for all the help everyone, I do apologize and did not offend anyone too much with my scooter. I have my eye out and may be back with a legit MOPED question. Until then, cheers.

MOPED ARMY

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