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View Full Version : 50cc w/ Over Range kit?



.:SR50thState:.
07-25-2008, 04:20 PM
Question for all the experts out there. If I do not go with a 70cc BBK and taller gears, Will a over range kit still increase both acceleration and top end? Iím assuming that all this does is widen the powerband allowing me to get the higher speeds at higher revs? Is the stock engine capable of fully utilizing the larger pulley?

Mr. Scootswell
07-25-2008, 04:50 PM
I'm not sure why Malossi makes an overrange kit for these bikes. They
come with a 134mm rear pulley, and a quality vario that uses 19x15.5mm
rollers. I would have to look at the aprilia manual to get the specs of the belt,
but its already quite wide. The over range belt is ~18mm.

With piaggios older than 1998, and minarelli bikes there is an advantage to
an overrange kit because the rear pulleys are 128mm, and the rollers are
smaller. Smaller rollers means less surface area, means sooner to get flat spots.

.:SR50thState:.
07-25-2008, 05:20 PM
I'm not sure why Malossi makes an overrange kit for these bikes. They
come with a 134mm rear pulley, and a quality vario that uses 19x15.5mm
rollers. I would have to look at the aprilia manual to get the specs of the belt,
but its already quite wide. The over range belt is ~18mm.

With piaggios older than 1998, and minarelli bikes there is an advantage to
an overrange kit because the rear pulleys are 128mm, and the rollers are
smaller. Smaller rollers means less surface area, means sooner to get flat spots.


So in your opinion a larger pulley would not grant additional performance as the pulley is already quite large on the 2009 Ditech's? And I also read that the belt is longer than stock to take advantage of the larger diameter of the pulley.

mtiberio
07-25-2008, 09:26 PM
I had an over range kit on my old minarelli yamaha vino. I sold it. it gave the bike great bottom end, and nothing extra up top. if I had wanted to fully exploit the kit I should have put in taller rear gears.

.:SR50thState:.
07-25-2008, 11:41 PM
I had an over range kit on my old minarelli yamaha vino. I sold it. it gave the bike great bottom end, and nothing extra up top. if I had wanted to fully exploit the kit I should have put in taller rear gears.

Hmm sounds like the overrange kit would only be fully utilized then if I had a BBK to push the taller gears.

Of course Mr. Scootswell could be right as well and the larger diameter pulley may not even be that much larger than stock.

Mr. Scootswell
07-27-2008, 12:12 PM
The over range kit will only add to the bottom end in any case. The 134mm
rear pulley creates a lower gear for take off, but the top end will be the same.

clsmooth
07-27-2008, 12:24 PM
What parts come with this "kit" and what's its part number?

High Gain Tuning
07-27-2008, 01:36 PM
And who sells them in the US?

.:SR50thState:.
07-27-2008, 02:41 PM
http://www.adrenalin-pedstop.com/p/GILERA-RUNNER-PIAGGIO-NRG-ETC--1291.aspx

No one in the US sells them yet, though you could probably get any shop that sells malossi to order it (for the piaggio engine anyways) by part # 611440

High Gain Tuning
07-27-2008, 03:30 PM
Says it fits: FITS:APRILIA SR 50 DI-TECH 2003-2004 which was the Morini engine. Anyone verify that the 03-04 Morini DiTech engines are the same as the late model US Morini DiTech engines?

.:SR50thState:.
07-27-2008, 04:04 PM
Says it fits: FITS:APRILIA SR 50 DI-TECH 2003-2004 which was the Morini engine. Anyone verify that the 03-04 Morini DiTech engines are the same as the late model US Morini DiTech engines?

You have to read the whole line....

FITS:APRILIA SR 50 DI-TECH 2003-2004 - PIAGGIO ENGINE

gikser
08-12-2009, 12:23 AM
sorry for the revival but has anyonee used this kit?? what can i expect from my 09 which already has bbk and malossi gears??

Goodship1002
08-12-2009, 01:42 AM
Well i did not know about this!

Sounds interesting, shame its not out for the ditech 01-03. I assume this is for people who have done everything else tuning wise, and just want a little more!

High Gain Tuning
08-12-2009, 04:57 AM
sorry for the revival but has anyonee used this kit?? what can i expect from my 09 which already has bbk and malossi gears??

Gikser

Be our guinea pig... If I had an 09 I would have already ordered one... You just need to figure out if the 09 is considered a long or short carter.

http://scooter-center.com/scoweb/pages/productdetail.grid?product=288621637600928&target=productdetail&category1=A&category2=CAT&cid=78965

http://scooter-center.com/scoweb/pages/productdetail.grid?product=288621637598736&target=productdetail&category1=A&category2=CAT&cid=78965

I'll order it in for you :cheers:

gikser
08-12-2009, 10:26 AM
How would i figure this out?? I have no other piaggio to go by

onu123
08-12-2009, 02:12 PM
I have MHR Overrange set on my '07 Factory.
I belive those rear plates have a slightly different angle than the original. (havent measured it tho...) So better acceleration...
And the variator it self was a mm or two bigger than the orig vario. So should be able to get some more top speed... like 2kph or so =P I atleast gained 2 kph.
Acceleration wise... goes like a 70cc. With a correct setting of course =P

You can read my setting in my sig.
Yellow spring sometimes lets the belt slip, but very rarely. With piaggio stock contra spring, it had even more superior acceleration, but had more trouble to get to top speed.

High Gain Tuning
08-12-2009, 02:21 PM
onu123

What engine is in your 07 factory.
Do you remember the Malossi part number?

High Gain Tuning
08-12-2009, 02:23 PM
How would i figure this out?? I have no other piaggio to go by

My guess is from crankshaft to rear variator shaft there are 2 different lengths so you get the correct belt. We would just have to get a couple guys from Europe to measure their carters and compare them.

onu123
08-12-2009, 02:34 PM
Oh double post.

onu123
08-12-2009, 02:38 PM
onu123

What engine is in your 07 factory.
Do you remember the Malossi part number?

My guess is from crankshaft to rear variator shaft there are 2 different lengths so you get the correct belt. We would just have to get a couple guys from Europe to measure their carters and compare them.

It's a Piaggio engine. Can't tell a more exact engine model.
If it helps, I can do some measuring on it. Tomorrow of-course =P
MHR Overrange part number for piaggio: M6113131 (Used in www.scooter-attack.com You'' atleast find it there.)
I'll check if there even is a morini engine's one... nope, didn't find one on Scooter-Attack.

gikser
08-12-2009, 04:47 PM
Come on guys from across the pond get us some measurements

High Gain Tuning
08-12-2009, 05:10 PM
I'll check if there even is a morini engine's one... nope, didn't find one on Scooter-Attack.

That's why I asked what engine you had.... Once again, the bastard child Morini gets left out. I tell you what... I could corner the market on HP Morini parts if I just knew a good machinest that wanted to go into business together.

Grenadiers
08-12-2009, 05:39 PM
That's why I asked what engine you had.... Once again, the bastard child Morini gets left out. I tell you what... I could corner the market on HP Morini parts if I just knew a good machinest that wanted to go into business together.

NO KIDDING!!! You would have all the US and Canada as your clients!!!