90cc mina clone decision

Ruckenstein · Post by **Ruckenstein** » Sat Jan 31, 2015 11:25 pm

Toying with the idea of a 90cc long case mina swap. Anyone had any experience with the Eton 90cc engines?

birdman · Post by **birdman** » Sun Feb 08, 2015 2:37 pm

Slightly different than yours, I just acquired a 90cc mina clone short case, its the same mounting as the long case. Long case would help keep wheelies under control. I hear it varies, but mine came stock with 8:1 final drive gearing. Also the ability to do a Big EVO build w/o having to cut a case is nice.

Ruckenstein · Post by **Ruckenstein** » Sun Feb 08, 2015 8:56 pm

How do you tell the difference between to GOOD and BAD long chinese clones?
Are there some names to hop on and others to run from?

birdman · Post by **birdman** » Mon Feb 09, 2015 12:39 am

Its whatever you can get your hands on honestly, you can always get a Chinese motor and put OEM Yamaha and Polaris parts on it and make it just as reliable as any other OEM Yammie or Polaris. The preferred method of doing a 90cc swap is to use a 90cc minarelli shortcase that came in some youth ATVs such as Polaris Sportsman90, Predator90, and Scrambler90. You can also bore out a set of regular minarelli 49cc cases to accept a larger 50-54mm bore cylinder, and use a stroker crank to get you to 90cc. Basically OEM Yamaha and Polaris parts will always be the highest in quality, but never run from a 90cc minarelli no matter what it is chinese or not.

Ruckenstein · Post by **Ruckenstein** » Mon Feb 09, 2015 11:34 am

I've heard that Etons are actually pretty good. Any insight?

birdman · Post by **birdman** » Mon Feb 09, 2015 2:54 pm

Ive also heard the same things about Eton but I cant say that I have any insight them.

whitey · Post by **whitey** » Sat Mar 14, 2015 9:21 am

What did you decide. Did you find a decent set of cases?

DirtyE · Post by **DirtyE** » Wed Apr 22, 2015 7:50 pm

We had a local rider here that bought a yamati strada or something like that, and he dropped a 103cc ruima kit in it. He melted pistons on a regular basis. Probably not the cases fault though.

1man8scoots · Post by **1man8scoots** » Wed Apr 22, 2015 11:22 pm

I'm building him a case ported/flowed and matched ported polini corsa with polini stuffer crank zuma engine. Say that three times fast and one breath.

DirtyE · Post by **DirtyE** » Sun May 03, 2015 10:02 am

What kind of timings/pipe and carb are you using 1man?

Ruckenstein · Post by **Ruckenstein** » Tue May 12, 2015 10:10 pm

Pipewise I'm going to start donating plasma so I can buy me a c16.
Carbwise I'm scooping up 1m8s' dellorto racing 19 milli.
Got my frame in the mail today, front disc on the way.

1man8scoots · Post by **1man8scoots** » Wed May 13, 2015 12:21 am

Front disc is going to be needed. 13/44 polini primary gears is going to be fast.

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90cc mina clone decision

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