Speed calculator

 

My 2003 Honda Monkey went 38mph brand new bone stock.



4 speed gearbox, 13/31 gearing



I'm guessing the older models depended on the gearbox and gearing.



Estimate 30-35mph for the US 3 speed models.

 

Using the speed calculator above, and filling in the stock configurations, I came up with these numbers:



1975 Z50AK6 - 30MPH at 10K RPM

1985 Z50R - 35MPH at 10K RPM

1995 Z50R - 35MPH at 10K RPM

 

I have a '71 Z50A-K2 hardtail that came stock with 12/35 gearing. With stock carb and exhaust on it it struggles to rev past 8000 rpm. I've seen it touch--briefly--8600-8800 rpm on a downhill, maybe with a tailwind, wide open. On the flat, wide open, it sits at 7500-8000. With a 4.00x8 tire run a little soft for bump absorption, that's less than 30 mph, but it can climb most of the road hills around here without shifting down with my large self on it.



I recently changed to 13/35 gearing and now it can top 30 on the flat but sometimes I have to shift down to 2nd gear on the big hills.



I haven't tested my son's Z50R yet but it feels like it's more willing to rev; not sure if I'm hitting 10K or not but it will definitely zing up higher than my old bike.

 

A stock Z50 won't hit 10,000 rpms unless you are going down a very large hill.

 

As the owner of -Ahem(coughs embarassingly) 6 Z's of various builds. Average is about 25 mph on my 6v-ers and about 30 on my 12v-ers. Not a one of them hits 10,000 rpms (and lives that is)

 

i was wondering the same thing. guess i've come along way from 25mph added another 25mph with a lifan and now hopefully 60 something with my z155.

 

my gsxr-1000 does about 180.

 

Didn't arlindsay "high speed record guy" get his stock z50 up to 40 something mph?

tmas

 

as the owner of -ahem(coughs embarassingly) 6 z's of various builds.

lol

 

I hit 43 by changing gearing and stripping off extra weight from the bike. Motor was stock except for airbox modifications. GPS confirmed.



I got a 72cc motor to hit 55. It will do 50 on flat ground and 55 on a slight downhill.

 

I believe you could get a stock Z to hit 60 MPH...



It would take a few things-

20 tooth front and 24 tooth rear!

Bonneville salt flats and 20 miles of track.

A push vehicle to get it up to at least 30.

A rider with a big brass set of B**** cause with 8 inch wheels in the salt you know its gonna get ugly!

 

I believe you could get a stock Z to hit 60 MPH...



It would take a few things-

Bonneville salt flats and 20 miles of track.

A push vehicle to get it up to at least 30.

A rider with a big brass set of B**** cause with 8 inch wheels in the salt you know its gonna get ugly!

and a cliff

 

i have a stock 50cc 1978 gorilla that all i have added is a aftermarket muffler, 1-1/2" exhaust pipe and aftermarket air cleaner. my speedo is in KM but i have had it pegged at 60kph passing a car that said i was doing 43mph.



looking to add a lifan 125cc or 110cc international shift. should get up to 60mph.



told by biker friends that 17 of them would ride behind me so i don't get run over on the way to a bike night celebration. so i want just a little more speed beside 43.



any bad things to know about lifan engines. i got a 6v bike. told to use a regulator to keep all my stuff working. thinking about switching to 12v anyway.

 

I believe you could get a stock Z to hit 60 MPH...

I don't think so. Theoretically if you geared it that high it would go that fast, but a stock motor simply doesn't have the power. I have a well worked over 72cc motor, ported short rod Z50 head, performance exhaust, 20mm carb, fully portmatched, and it barely hits 55. It isn't like it tops out because of gearing, it just doesn't have the power to go faster.

 

I believe you could get a stock Z to hit 60 MPH...



It would take a few things-

20 tooth front and 24 tooth rear!

Bonneville salt flats and 20 miles of track.

A push vehicle to get it up to at least 30.

A rider with a big brass set of B**** cause with 8 inch wheels in the salt you know its gonna get ugly!

You didnt finish my quote. You can get anything to go fast its how you get there. Hence the push vehicle and 20 miles of track. Maybe a rocket too...

 

Here's a file photo of "The Virginia Blur" practicing for his high-speed run...

 

9.8m/s/s

 

^^^nice photoshop or did you use the paint program?

 

Rocket power

Maybe a rocket too...

LMAO..Tim.... We can't forget about the rocket pic of the qwoke-q the High speed record guy.

tmas

 

Once I saw that post about the rocket I knew I didn't have to wait long for that picture to come up.

 

You didnt finish my quote. You can get anything to go fast its how you get there. Hence the push vehicle and 20 miles of track. Maybe a rocket too...

First gear with that gearing would be similar to third gear with stock gearing. A stock motor can take off in third gear no problem. Sluggish yes, but impossible no. The stock motor can't go 60 mph with any gearing. Drag increases exponentially with speed. The bike has the power to carry the weight of itself and rider, and also work against a certain amount of wind resistance. The wind resistance is too much at 60 mph and the stock motor simply can't do it. Not unless you ride with a very, very strong tailwind.

 

One of my favorite photos from the past!

 

I'm putting clip-ons, a couple inches more arm, a big motor, and goin' Rollie Free-style.

 

I'm putting clip-ons, a couple inches more arm, a big motor, and goin' Rollie Free-style.

hopefully u will put that big hemi on the stand on ur pink QA