Za50 sprockets

Jeff insinna /

Has anyone ever ran a 20 /40 sprocket set up on a stock za50?... Trying to gain a bit more top speed...or will it be a total dog

Re: Za50 sprockets

I ran a 20 front on mine, can't remember the rear to.. it was the stock 2hp magnum mkii rear sprocket if that helps.

You gotta grind the case to fit a 19 tooth or more front I think, maybe it's the 20 can't remember... anyway, I used a Dremel with a carbide Burr until it fit.

Re: Za50 sprockets

Jeff insinna /

Did u find it was worth it?

Re: Za50 sprockets

yeah 19 needs a lil' grinding, 20 needs a lotta grinding.

i like to run 35 rear then all my 'normal sized' e50 sprockets 14-18 on the front. Basically you buy one rear sprocket to fit the bike, and the front gears all match what you would have on an E50 for a comparable setup running a 45 rear.

Re: Za50 sprockets

Overpriced Parts /

20x40=18x36 is 2.00 ratio stock ratio is like 2.22

If absolutely stock 2hp za50 with stock pipe, carb and airbox I would leave stock 18x40 gearing, even if you put a performance filter and pipe on stock gearing would still be fine,

If want a bit more speed and power try a metal mesh filter and upjet carb and or a circuit pipe, I had several Newport II’s (and still have one) and they respond well carb/filter changes and with a low end performance pipe they really go good!

My performance reed kitted with big carb builds run 21x35 gears and one has 22x35 gears,

You can go 21 tooth without blowing into magneto area if you finish last few mm with sandpaper rolls on dremel going slow and taking your time checking it with sprocket and a small piece of chain every .5 mm

For 22 tooth sprocket do you need to rough up and coat the inside of the magneto area with a layer of JB Weld/epoxy, thin piece of aluminum in area then dremel with bit then finish with sandpaper roll, if you take your time you will barely go through into inside to the epoxy aluminum sandwich to fit 22 tooth

Re: Za50 sprockets

I did 21x40 za50, circuit pipe, 16mm SHA, 2hp maxi cylinder with flipped clutch on a heavy ass magnum. It was fine I guess? Hit 40 maybe on the flat, take off was okay but i’m a 150lb soi boi

Re: Za50 sprockets

Overpriced Parts /

> c k Wrote:

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

> I did 21x40 za50, circuit pipe, 16mm SHA, 2hp maxi cylinder with flipped

> clutch on a heavy ass magnum. It was fine I guess? Hit 40 maybe on the

> flat, take off was okay but i’m a 150lb soi boi

The maxi cylinder sucks compared to the magnum cylinder which is basically a magnum X topend that was 4.2 HP, maxi at least one horsepower less,

Stock gearing, stock carburetor, 14mm intake, stock exhaust with one 5/16 hole in the bottom of chamber and one hole in the endcap and I weigh 200 pounds:

The bike has some upgrades since this video, New crank bearings, new seals new pucks, any bearing that was bad in the engine was replaced, 14 mm bing, treats chamber, mesh filter, it’s a joy to ride, keeps up with kidded bikes,

Yeah and it’s for sale too, email me if you’re interested

Re: Za50 sprockets

Jeff insinna /

That makes alot of sense the way you explain it.... thanks

Re: Za50 sprockets

She’s thick and brought some friends with her, she pulls up & we do some shots of Twitter.

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(edited)

Re: Za50 sprockets

I can 100% say a 21 will not blow through the crank case.

Re: Za50 sprockets

I run 18x37 on mine, kisses 40mph, accel is decent

Re: Za50 sprockets

New at this and a bit confused by it all. I have a Magnum II that has a ZA50, I am putting a 65cc Metra kit on with a 19mm Dellorto carb and running a pipe from my buddy that is an upgrade but not sure exact brand, Wonder where to start with sprockets. Would prefer to not grind case if possible. Bike has spoked wheels if that matters. Replacing bearings and seals. Thanks for any insight or shared experience.

Re: Za50 sprockets

Grinding ain't hard bro. If you wanna change the front ur gonna be grinding...

But you can start by leaving it alone and see if you like it. I put a 20 on the front of my za cuz I diddnt want to over rev the thing...was running a bushing crank.

Don't forget your shift pucks of you haven't changed em already .

Re: Za50 sprockets

This 35t sprocket is as low as you can go on spoke wheels with a plug and play part. I've had pretty good luck on my 62 Malossi ZA50s running 18x35 with a 15 bing and a lil Proma GP pipe. If you're pushing a lot of RPMs you may want to go with the 19t front sprocket as well, but I dunno if a 65 piston port kit is gonna wind out that much. Would be helpful to know what pipe you're using

Re: Za50 sprockets

Highly recommend the gear calculator in Marty’s toolbox. You can play out different scenarios there and pick which sprockets you want to use.

I have a polini ZA50 and run 21x37. 37 was the smallest I could go without major sprocket fabrication in my wheels.

Re: Za50 sprockets

I believe it is a Techno gas side bleed.

Re: Za50 sprockets

Overpriced Parts /

> Aaron Goldman Wrote:

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

> Highly recommend the gear calculator in Marty’s toolbox. You can play

> out different scenarios there and pick which sprockets you want to use.

>

> I have a polini ZA50 and run 21x37. 37 was the smallest I could go

> without major sprocket fabrication in my wheels.

You can go 22x37 just put A few layers of Epoxy on the inside of your case magneto area, take your time using dremel sandpaper rolls for final finish,

Checking with scrap of chain on 22t sprocket and it may barely poke through the case and just touch the epoxy layer, some chains like stock chain aren’t as thick and you may hardly go through

Re: Za50 sprockets

ᴛᴇʀʀʏ ᴅᴇᴀɴ /

iirc, i'm at a 21 front and I think stock rear on my gila za50 with a 21 phbg and proma circuit. bike's in the high 50s and super reliable.

Re: Za50 sprockets

ᴛᴇʀʀʏ ᴅᴇᴀɴ /

nevermind, i went back through my notes, i'm running 19/36

i think the 21 i was going to use was cracked so i went with the 19. built it so long ago i can't remember haha

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