Italjet Dragster 180 project

[Martin t]

Hello everyone Martin here from Sweden, 21 years old.

The bike as it was when i bought it, only thing done was it had got a malossi barrel fitted.


i got myself a pm 59 exhaust bout a year ago


Also got an egt to make it easier to setup the card and to see if its too lean for ex. running on highway (same throttle for a long time).




Hmm whats this i have on my table




Trying out some different reeds and inlets, i am currently running a dellorto phbl 25 carb.


That was summer 2007, time for some porting and projekt in the winter!

The bike now


Splitting the engine.


Nice and clean


I have been calculating some on what crank to get and 55mm will make the ports to extreme for the pm pipe, the pipe is said to give maximum power at around 8500-8800 rpm which means that 185 exhuast and 128 transfer ports will be perfect. With a 54mm crank i will need to go 1mm up on the exhaustport and do nothing to the transferports except lowering them to get more fuel/air into the barrel. Exhaust is also lowerd to make the area bigger.

The new mazza crank


Tool made in a workshop specially for pulling crank into place, makes it easy to achive som bearing play when engine is put together.


Crank in engine


Time to measure port times, Fitted 1mm spacer under barrel with 0,5mm basegasket giving exactly 0,8mm squish.


Matching barrel to engine halves.


Not the final look forgot to take pictures on that actually but this is almost as the finished result.




Also made a mount for an accelerationmeter while engine was apart.





Have put it all together now, started on second kick have just had it idleing some will update a little later with some more pictures and maybe a little testride.

Will also have it repainted in dark greymetallic

Finally i get motivated to update this thread

As i said new colour will be and has now been applied and the results turned out to be awesome!





A bigger carb and reeds from a kawasaki kx85 has been added and my only comment is scrap your dellortos this carb is so much better, now it wheelies all the time just on throttle pull!


Also moved the gauges to a more viewable place

[Dragspert]

Nice dragster man!

I'm curious about the HP's of the PM tuning cilinder+exhaust.

Darkgrey is a nice color for a dragster are you gonna paint the legshields too? In the same color ofcourse

[Martin t]

Gonna keep them black actually, think it looks "too much painted" if everything is in the same colour.

[Dragspert]

Het Grote plaats hier je scooter topic #4

almost at the bottom of the page you'll see my dragster witch is sold a couple of weeks ago. At first I was curious about the looks, but never felt sorry about it.

I think it should be done with soft colors. Not that fluor yellow that you've got now, but for example dark grey, soft white, black, dark red, dark blue, you name them

But ofcourse, it's your machine and your choice

[hac]

nice work....on whot RPM works PM 59 exaust, and whots max rpm ?

[narx]

Very nice parts

Do you have more pictures of crank puller from the other side where its attached to the crank? I will be fabricating one as well.

[Martin t]

I'll take som pictures of it.

[Browni]

Originally Posted by narx

Very nice parts

Do you have more pictures of crank puller from the other side where its attached to the crank? I will be fabricating one as well.

A crank puller is a simple tool, just buy a simple M20 bolt. Drill a bore at the end of the bolt (I suggest you use a lathe), and make a thread in it (the same thread as the crank has). Use a suitable size tube as the outer part of the tool. Each end of the tube supports the enginecase the other end support the M20 nut (+washers). So you can pull the crank with the M20 nut! All this thing costs a few euros.

[Martin t]

[narx]

Thanks guys.

Browni, I guess the bolt and the nut should have a left-handed thread, right? With that kind of tool the crank will rotate as its being pulled in the bearing, does it matter?

[Martin t]

It is left threaded yes, your quite clever hehe

[Browni]

Originally Posted by narx

Thanks guys.

Browni, I guess the bolt and the nut should have a left-handed thread, right? With that kind of tool the crank will rotate as its being pulled in the bearing, does it matter?

No it's not necessary! The crank doesn't rotate when you pulling in with the tool.

First step you screw the M20 bolt onto the crank by rotating it like a simple nut. After that the bolt is connected to the crank.
When you turn right the nut on the M20 screw you need to dolly the bolt's head with another wrench, so the crank and the bolt is not turning!

Maybe Martin's tool works different way, but my personakl opinion is that one is needlessly complicate. It's also not very good if you rotate it with a lefthanded tool because the crank's thread have an "active role" (radial forces on the thread).
I am NOT saying Martin's tool is bad, it's also great but the other tool protect the crank's thread more!


If you still not understand I will take some photoes.

[narx]

I undrestand, thanks!

p.s Martin, sorry for the offtopic in your project thread

[barrboo]

nice drag keep up the good work.
Have you drilled out the brake mount to fit your accelerationmeter if so i would keep a verry close eye on this as they are know for snaping there is a company here in england that make renforcment brackets to stop this there called psn scooters you could just coppy the bracket too if you want i will get you some pictures of one. oh and it keep a eye on the pm59 too as they are verry prone to snaping.

[Nyle]

Nice Drag. I gota Gilera 180, with the mazz 54mm crank and Polini kit. Runs strong.

[Velo]

Nice dragster.
Håber du får den til at spinde som du forventer.

[PhilpGW]

very nice i think it will become a monster !!!

[Martin t]

Originally Posted by Browni

No it's not necessary! The crank doesn't rotate when you pulling in with the tool.

First step you screw the M20 bolt onto the crank by rotating it like a simple nut. After that the bolt is connected to the crank.
When you turn right the nut on the M20 screw you need to dolly the bolt's head with another wrench, so the crank and the bolt is not turning!

Maybe Martin's tool works different way, but my personakl opinion is that one is needlessly complicate. It's also not very good if you rotate it with a lefthanded tool because the crank's thread have an "active role" (radial forces on the thread).
I am NOT saying Martin's tool is bad, it's also great but the other tool protect the crank's thread more!


If you still not understand I will take some photoes.

The point with leftthread is that it will not unthread from the crank when you pull the crank into the bearing. You also want to pull on the whole thread on the crank. The tool works perfect and it has also been used on a Malossi mhr crank that is alot tighter in the bearing than a Mazza crank. Nad how are you thinking about your tool protecting the crank threads more? this tool uses the whole length of the thread on both sides, it is not possible to protect the threads more than that.

[Martin t]

Originally Posted by barrboo

nice drag keep up the good work.
Have you drilled out the brake mount to fit your accelerationmeter if so i would keep a verry close eye on this as they are know for snaping there is a company here in england that make renforcment brackets to stop this there called psn scooters you could just coppy the bracket too if you want i will get you some pictures of one. oh and it keep a eye on the pm59 too as they are verry prone to snaping.

Yes everything is shit if you read italjetdragster.com, pm heads are shit, pm 59 are shit, mazza cranks are shit blablabla there are so many rumours about shit stuff so why does my stuff work? Because i know how to set it up properly.

The most brakemounts that have snapped is because people have had a lock in the rear wheel and driven away with it in the wheel, if your wheel does a full circle and the lock bangs into the caliper it will be alot of stress for the mounting bracket.

[Martin t]

The colour it will be painted in btw, only done the front mudguard yet.

[Martin t]

Updated!

[D.J]

Supersweet

[Izimo]

Awesome Dragster

[the max]

Happy with the PM curly pipe ?

[Martin t]

Originally Posted by the max

Happy with the PM curly pipe ?

Very!
You just have to give it some setup time and it gives loads of hp!

[xzburnoutzx]

Always loved the Dragster 180. Looking sweet as ever...

[rydah]

what kinds of speeds are you getting out of your current set up. it looks really good, also is this set up too loud for the streets. oh yeah have you raced any raced tuned 70cc scooters.

[Martin t]

Originally Posted by rydah

what kinds of speeds are you getting out of your current set up. it looks really good, also is this set up too loud for the streets. oh yeah have you raced any raced tuned 70cc scooters.

Pretty loud or maybe very loud setup but here in Sweden the police actually don't complain that much about it, so there is no problem riding around town with it

Haven't raced any properly tuned 70cc yet, done 145 km h on the clock with original 180 gearing but im not into the top speed thing, wheelies and blistering acceleration is the way to go

[D.J]

I could not agree with you more...

Where are the videos? It's an awesome dragster!!!