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-   -   FNR Box (http://www.offroadfabnet.com/forums/showthread.php?t=11762)

entropy 06-22-2017 03:56 PM

FNR Box
 
Is there a box that is under say... $400 and will take a 250cc 4-stroke Bike engine?

E

alwaysFlOoReD 06-22-2017 11:13 PM

FNR = Forward and Reverse?
PS; can't help in any case. good luck.

R.DesJardin 06-23-2017 11:09 AM

How about a T90 3spd trans from a Scout, gotta be cheap. Just block off the 2-3 side. Or a 3spd from a 60's GM 2wd pickup or car. The ole 3 on the tree unit.

entropy 06-23-2017 03:44 PM

Quote:

Originally Posted by alwaysFlOoReD (Post 143117)
FNR = Forward and Reverse?
PS; can't help in any case. good luck.

Yes: Fwd & Rev

entropy 06-23-2017 03:51 PM

Quote:

Originally Posted by R.DesJardin (Post 143123)
How about a T90 3spd trans from a Scout, gotta be cheap. Just block off the 2-3 side. Or a 3spd from a 60's GM 2wd pickup or car. The ole 3 on the tree unit.

Thought about it.
Actually have a T90 of the Scout flavor and the Spicer 18 Case, I'd rather sell em!
Also a Datsun T/C but that has no reverse but would be a sweet little 4WD creator, and I should sell it off too!

Really want something smaller, which I can find, but I have no budget so, $1500 is just not going to happen.

Thinking about going with the starter motor drive... Simple, Light weight...

Just figured I'd ask:beer:

TheBandit 06-23-2017 04:04 PM

Quote:

Originally Posted by entropy (Post 143125)
Yes: Fwd & Rev

The "N" isn't for "neutral"?

entropy 06-23-2017 04:16 PM

Quote:

Originally Posted by TheBandit (Post 143127)
The "N" isn't for "neutral"?

Generally yes.
I have seen one that is just F/R.

I just have not seen one that is afordable:eyemouth:

R.DesJardin 06-23-2017 06:01 PM

I need more details. I have an idea. What's it for?

entropy 06-23-2017 07:28 PM

Quote:

Originally Posted by R.DesJardin (Post 143129)
I need more details. I have an idea. What's it for?

Mid 70's Honda XL 250 engine.
Simple tube chassis/Riding lawn mower.
Minimal wheel travel. Solid axles Front>RadArm, Rear>Swing arm?
Somewhere on here there is a pix of the exhaust that is on it.
I'll stretch the wheelbase maybe a foot and slap on some ATV tires.
Needs to go slow, and a little fast; how much is that??? 25-MPH?
Just a functional tractor/ATV type toy for here on the place and maybe running in the snow... and I would like to keep the most expensive parts being the Wheels and Tires.

This is project # 385...

E

R.DesJardin 06-23-2017 07:49 PM

Ok, then.. I have seen two v-belts one has a twist, the tensioner /shift lever can tighten one of the other. The other just is loose when not is use. Seems like it was on a an old tiller or mower. Tiller I think. Yeah look at old rototiller drives.

R.DesJardin 06-23-2017 08:30 PM

http://photos.cubfest.com/albums/use...lt_Routing.jpg

Something like this.

entropy 06-24-2017 11:16 AM

Quote:

Originally Posted by R.DesJardin (Post 143132)

Yup, Dad had an old walk behind sickle-bar mower that was set up like that.
But, we are talking under 5HP I wonder what kind of power a belt setup could reasonably take...

dean 06-24-2017 05:43 PM

i've built several projects like this,from 10hp go karts to a 110 hp buggy.
if you are using a riding lawn mower to start with,use the original rear diff and trans as it should have fnr plus a semi automatic transmission.been there done that.
1970's xl 250 had max 20 hp so unless you've redone it big time i'd be confident in the oem drivetrain.
just my 8 1/2 cents.
i'm from canada so that means 2 cents usd

entropy 06-24-2017 07:57 PM

Quote:

Originally Posted by dean (Post 143137)
i've built several projects like this,from 10hp go karts to a 110 hp buggy.
if you are using a riding lawn mower to start with,use the original rear diff and trans as it should have fnr plus a semi automatic transmission.been there done that.
1970's xl 250 had max 20 hp so unless you've redone it big time i'd be confident in the oem drivetrain.
just my 8 1/2 cents.
i'm from canada so that means 2 cents usd

Lawn mower has a vertical shaft and the belt runs horizontal.
MotorPickel has horizontal shaft and vertical chain drive...
Chain / Belt is not a big deal; Vertical to horizontal is.
And the Mower trans-axle is noizy, one of the reasons to replace it.

E

alwaysFlOoReD 06-24-2017 08:24 PM

Its been awhile since I owned a Snapper lawnmower. IIRC It had an axle with a plate on the same plane as the ground. The motor drive belt turned a wheel that intersected 90* with the axle drive plate and that could slide closer to and farther from the drive plate center-line. This gave a continuously variable drive. It slipped when wet tho. And I don't remember how reverse was hooked up.

bullnerd 06-24-2017 11:48 PM

CL for used Polaris parts?

Polaris has a lot of different combinations of gear boxes.

Minibuggy.net has a whole section on FNR/drivetrain, but like you said, probably too $$$, might be worth a look to get some ideas though.

vidio1 06-25-2017 09:27 AM

What bullnerd said....Look for a trailblazer, sport, or scrambler transmission from Polaris, there's a few on Ebay for around $300 right now.

entropy 06-26-2017 12:16 PM

Quote:

Originally Posted by bullnerd (Post 143141)
CL for used Polaris parts?

Polaris has a lot of different combinations of gear boxes.
SNIP<

Quote:

Originally Posted by vidio1 (Post 143142)
What bullnerd said....Look for a trailblazer, sport, or scrambler transmission from Polaris, there's a few on Ebay for around $300 right now.

This is a great idea...
It begs the question; why not just pick up a used ATV and re-purpose from there, and that would bring up the question of what to look for...
and at a priority of #385 the fact is nothing is going to happen any time soon.
Which gives me a bunch of time to find the best option for this...

Finally as I let the cat out of the bag there is now some family pressure to restore Dad's old bike which I did not expect... At all:shaking:

E

cbrogers 07-07-2017 03:55 PM

You might scour the junk yards and look for an old ditch with or trencher. They usually have a forward and reverse gearing that could be used. Also some of then actually used Dana 60 center sections and have a locker installed in them.


Carl


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