Stock Puch crank with a 10mm needle bearing

Chillin I’m the shed watching the snow fall and I had this idea. I pressed the brass bushing out and replaced it with a 10mm bearing from a Yamaha jog and it fits perfect!

DE669C20-996E-46AF-A94E-9EC1FCD9010B.jpeg

Re: Stock Puch crank with a 10mm needle bearing

Snowy Okmonik /

I don't think the lack of needle bearing is what causes the stock cranks to fail

Re: Stock Puch crank with a 10mm needle bearing

Im thinking of building an e50 with a Yamaha jog motor. It’s going to be the biggest pile of junk using all old parts.

I’m going to use jb weld to hold the cylinder on. Wish me luck!

Re: Stock Puch crank with a 10mm needle bearing

whats the con race spec? is it roller ready? prolly not...its yours have fun :)

Re: Stock Puch crank with a 10mm needle bearing

Overpriced Parts /

I did that before with a needle bearing but I had to ream then polish small end of the rod out just a little because with the 10 mm wrist pin put in the needle bearing was a bit tight,

I had a few stock puch pistons with 10mm wrist pins I used up on stock za50s that had bad crank bushings and they ran ok.

If yours fits loose like its suppose to with proper clearance I suggest you at least polish the inside of crank inside nice and smooth then you can run a alumakit piston or kit that has a 10mm pin or you may be able to find a puch piston that has a 10mm Pin to use stock cylinder

But most puch cranks failures I had was in big end not small end because most stock puch cranks have bushings not bearings in big end like the small end too and tiny oil grooves on side and with hi rpm will seize.

My son locked his up mild mod stock cylinder za50 magnum II crank with stock gearing a while ago on his fifth ride with it (I had it for years with no problems before it was his) because he is 60lb lighter and nowhere near as wide then me so he goes about 2-3 mph faster on most our bikes then me so he was goin 45mph, near 10k rpm when it locked on bottom end:

The small end crank bushing was perfect,

Re: Stock Puch crank with a 10mm needle bearing

Dirty30 Dillon /

People have attempted to do this for awhile, most claim that it runs fine, but I have never heard a follow up.

Running a needle bearing in an unreemed rod end certainly may work, but will inevitably fail do to poor clearances and out-of round ID's

Re: Stock Puch crank with a 10mm needle bearing

Yea also I don’t think it’s hardened, I wouldn’t try it.

Re: Stock Puch crank with a 10mm needle bearing

Vertical jog cylinders actually have the exact same bolt spacing as puch. The things I've learned.

Prob is that Conrod isn't hardened.

That bearing is gonna thrash the weak conrod most likely but fuck it, try it

Re: Stock Puch crank with a 10mm needle bearing

> JBOT Admin Wrote:

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

> Vertical jog cylinders actually have the exact same bolt spacing as

> puch. The things I've learned.

>

> Prob is that Conrod isn't hardened.

>

> That bearing is gonna thrash the weak conrod most likely but fuck it,

> try it

What did you just say? the vertical jog cylinders fit Puch! No fucking way

Omg Im going to Put a Puch 70cc reed kit on my vertical jog then...

This is now a scooter forum

I started drink tea and I’m understanding why the Boston tea party happened. Black tea good

Re: Stock Puch crank with a 10mm needle bearing

https://www.treatland.tv/TOP-crankshaft-needle-bearing-10-x-14-x-13-p/needle-bearing-10x14x13-top.htm

Just in case. These have been used in Tomos a3 rods which are the same id as Puch rods.

Re: Stock Puch crank with a 10mm needle bearing

Dirty30 Dillon /

> Rocco Taco Wrote:

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

> > JBOT Admin Wrote:

>

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

>

> > Vertical jog cylinders actually have the exact same bolt spacing as

>

> > puch. The things I've learned.

>

> >

>

> > Prob is that Conrod isn't hardened.

>

> >

>

> > That bearing is gonna thrash the weak conrod most likely but fuck it,

>

> > try it

>

> What did you just say? the vertical jog cylinders fit Puch! No fucking

> way

>

> Omg Im going to Put a Puch 70cc reed kit on my vertical jog then...

>

> This is now a scooter forum

>

> I started drink tea and I’m understanding why the Boston tea party

> happened. Black tea good

He said the studs line up, not the stroke, deck height or port windows.

Re: Stock Puch crank with a 10mm needle bearing

You could do it if you could get a 10mm piston that fits. 12mm pin can't get through a 10mm crank.

You'd just have to do a bunch of milling to get squish right

Re: Stock Puch crank with a 10mm needle bearing

Guys the most difficult part for me is the stud pattern. I probably won’t do it anyways because the transfers are so different.

I have a better idea with less work! Yamaha verticals and horizontals both like to overheat. Wonder if i could use a Puch water coooled head?! Not much work and a big payoff

Re: Stock Puch crank with a 10mm needle bearing

> Rocco Taco Wrote:

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

> Guys the most difficult part for me is the stud pattern. I probably

> won’t do it anyways because the transfers are so different.

>

> I have a better idea with less work! Yamaha verticals and horizontals

> both like to overheat. Wonder if i could use a Puch water coooled head?!

> Not much work and a big payoff

You can get cheap scooter lc kits on eBay.

Re: Stock Puch crank with a 10mm needle bearing

campeona del mundo /

i did this to a za50 crank and ran an a3 airsal kit. honed the small end with a ball hone until the wrist pin fit nicely. it blew up 500 miles later. ¯\_(ツ)_/¯

Re: Stock Puch crank with a 10mm needle bearing

> Thomas TPRF Wrote:

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

> > Rocco Taco Wrote:

>

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

>

> > Guys the most difficult part for me is the stud pattern. I probably

>

> > won’t do it anyways because the transfers are so different.

>

> >

>

> > I have a better idea with less work! Yamaha verticals and horizontals

>

> > both like to overheat. Wonder if i could use a Puch water coooled

> head?!

>

> > Not much work and a big payoff

>

> You can get cheap scooter lc kits on eBay.

I know I know, I’m the king of eBay! But to be honest those cheap chines kits have horrible head gasket issue so I rather just use something with a dry deck.

Re: Stock Puch crank with a 10mm needle bearing

What?

I've never in my life had a jog or horizontal minarelli overhear.

Wtf bs are you spitting dawg

Re: Stock Puch crank with a 10mm needle bearing

> JBOT Admin Wrote:

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

> What?

>

> I've never in my life had a jog or horizontal minarelli overhear.

>

> Wtf bs are you spitting dawg

Skip to about 2:25 for some soft sieze action!

Big bore kits! Horrible cooling, I thought about adding some heat sink fins from a computer store. They are force cooled with a fan, it works okay.

I seize my scooter when I wasn’t runing a fan or ducting. Still they don’t like high temps about 350(edited)

Re: Stock Puch crank with a 10mm needle bearing

Dirty30 Dillon /

Yeah, minarelli Hor/Vert motors are some of the most dependable scooter motors out there.

If you are seizing them, you're doing something wrong.

Re: Stock Puch crank with a 10mm needle bearing

> Dirty30 Dillon Wrote:

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

> Yeah, minarelli Hor/Vert motors are some of the most dependable scooter

> motors out there.

>

> If you are seizing them, you're doing something wrong.

Yes as stock scooters they are great! Yes highly dependable will never brake.

Once you start kitting them, they like to over heat. there Is literally an article about big bore scooter that dedicated an entire paragraph to min horz and about their soft Sieze issue after boring them out and they use that video as an example. They also mention that the worse engine failure is not from the soft seize but actually the stress the seizure put on the small end bearing (This could lead to massive engine failure)

Yes I’m doing something wrong, I got that bitch wide fucking open(edited)

Re: Stock Puch crank with a 10mm needle bearing

You're a super shitty tuner then

Re: Stock Puch crank with a 10mm needle bearing

My horizontal minarelli has a stroker crank and basically is 80 something ccs. High comp.

Fastest bike I own. Fastest bike I'd want to ever have. Cannot kill it.

Though if you use a stupid 80to 1 oilmix like I did at one point it'll fuck up your small end, but using standard 32:1 never an issue.

Re: Stock Puch crank with a 10mm needle bearing

> JBOT Admin Wrote:

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

> You're a super shitty tuner then

This could be true

Re: Stock Puch crank with a 10mm needle bearing

I bet you either had an air leak or was underjetted. Reeded scooters can run on all sorts of jetting ranges, very easy to jet it lean and burn it up.

Re: Stock Puch crank with a 10mm needle bearing

> JBOT Admin Wrote:

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

> I bet you either had an air leak or was underjetted. Reeded scooters can

> run on all sorts of jetting ranges, very easy to jet it lean and burn it

> up.

It had No fan or ducting. It was my first scooter build, I bought the scooter at a flea market for 50 bucks and it was missing a lot of parts.

But yea it probably had air leaks and all that am bad stuff. It’s mad fun though! They do hall-ass, it makes be kinda depressed because I know my Puch Maxi e50 will never be that fast even with a lot of time and money.

Orange is jog, The white one is a Riva. Both purchased from the same original owner.

C21842E9-606F-495B-9216-463FB23C3F70.jpeg

Re: Stock Puch crank with a 10mm needle bearing

Well duh you need a fan and shroud. Of course you overheated Jesus help him jesus

Re: Stock Puch crank with a 10mm needle bearing

> JBOT Admin Wrote:

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

> Well duh you need a fan and shroud. Of course you overheated Jesus help

> him jesus

Jbot maybe your Jesus

Re: Stock Puch crank with a 10mm needle bearing

You're

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