Another sprocket ratio question, this time for Minarelli V1

Trent Anderson /

Apr 25, 2019 11:11AM

Some 40 years ago, I wanted more speed out of my Motron (surprise it's a Motron, surprise I wanted more speed, right?) that originally came with 9:44 sprockets. First I bought an 11 for the front, so 11:44 and the bike, with no other enhancements, went 30 mph. Of course, I wanted faster, so I got a 36 for the rear. 40 mph on level ground but 10 to 15 up tough hills, so 11:36 ratio.

I'm getting the engine rebuilt this month after roughly 20 years since the last time it was ridden, and I'm thinking of going back to the 11:44 ratio, but I will need a longer chain, of course.

Or do i?

If I switch the front sprocket to a 9, a 9:36 will have the SAME RATIO as the 11:44, but my mechanic is saying that I will have an rpm issue at 9:36 that I won't have at 11:44.

Thoughts?

Re: Another sprocket ratio question, this time for Minarelli V1

Cpt. F. /

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brendan

Apr 25, 2019 11:14AM

Re: Another sprocket ratio question, this time for Minarelli V1

Trent Anderson /

tanderson78 OP

Apr 25, 2019 11:46AM

This chart has green/black, yellow/black, and yellow/red. Which combinations are good, bad, or ugly?

Re: Another sprocket ratio question, this time for Minarelli V1

>>>taykoff [s2m] /

taykoff

Apr 25, 2019 12:39PM

Green: Good.

Yellow: OK for kits that can huff it....bad for stock.

Red: Bad. (Exceptions can be made for wizards rocking LC scooter kits)

Magic ratio number to shoot for is 3.4 typically for v1's...

Re: Another sprocket ratio question, this time for Minarelli V1

Dirty30 Dillon /

hydra

Apr 25, 2019 12:46PM

> Trent Anderson Wrote:

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

> My mechanic is saying that I will have an rpm issue at

> 9:36 that I won't have at 11:44.

>

> Thoughts?

He is mistaken. If anything, the smaller sprockets and shorter chain give you less rotational mass.

Re: Another sprocket ratio question, this time for Minarelli V1

🇮🇹💦 Of the Loin /

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maitland

Apr 26, 2019 01:38AM

11x33 can be pulled by a polini 80 ask me how

Re: Another sprocket ratio question, this time for Minarelli V1

A Fouler Fowler /

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fowler

Apr 26, 2019 10:41AM

Less rotational mass? The reduction of mass is so small it really doesn't matter. I could argue that more teeth and more chain will wear out slower.

Re: Another sprocket ratio question, this time for Minarelli V1

Ascoute Zeros /

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andyscouten

Apr 26, 2019 12:06PM

on a stock set up with 11x36!? thats nutz, I run 10-36/32 on my kitted V1's, there is no way in hell I could handle that gear ratio with out all the mods on my motor

also your doing it wrong having someone else build your bikes, your doing it even more wrong second guessing his knowledge, when you yourself cant rebuild the motor.

but at least its Richard building them, and he knows what he's doing

Re: Another sprocket ratio question, this time for Minarelli V1

Dirty30 Dillon /

hydra

Apr 26, 2019 12:42PM

> Full Tuck Wrote:

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

> Less rotational mass? The reduction of mass is so small it really

> doesn't matter. I could argue that more teeth and more chain will wear

> out slower.

You're talking about like 10 links just off the chain ... that's pretty substantial.

I would rather be turning smaller gears at the same ratio than larger gears at the same ratio.

Re: Another sprocket ratio question, this time for Minarelli V1

P D /

pdcomm

Apr 26, 2019 12:48PM

Small gears wear faster than larger gears .

Re: Another sprocket ratio question, this time for Minarelli V1

Graham Motzing /

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grahammotzing

Apr 26, 2019 12:48PM

larger gears results in less change in angle of each individual link and less line-pull torque, running over a small gear will always wear out a chain faster than running over a larger gear.

buuuuut

its mopeds so who gives a fuck.

Re: Another sprocket ratio question, this time for Minarelli V1

P D /

pdcomm

Apr 26, 2019 12:50PM

> Graham Motzing Wrote:

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

> larger gears results in less change in angle of each individual link and

> less line-pull torque, running over a small gear will always wear out a

> chain faster than running over a larger gear.

>

> buuuuut

>

> its mopeds so who gives a fuck.

Lest we forget . LOL

Re: Another sprocket ratio question, this time for Minarelli V1

Trent Anderson /

tanderson78 OP

Apr 27, 2019 10:56AM

Much better for me to learn by trial and error, with the wrong tools, ruin 12 motors, hope I rebuild at least one engine correctly, and spend all my time "wrenching" than have one of the few people on this site that actually know what they are doing rebuild my motors.

Got it.

Re: Another sprocket ratio question, this time for Minarelli V1

P D /

pdcomm

Apr 27, 2019 11:23AM

No one said education is cheap . ;)

Re: Another sprocket ratio question, this time for Minarelli V1

🇮🇹💦 Of the Loin /

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maitland

Apr 27, 2019 12:48PM

Mopeds are low enough effort and also need some extra thought into reliability that you don't need a mechanic and should probably figure your favorite brand out yourself

Cars are another story

MOPED ARMY

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