ESE's works engine tuner

[twotempi]

and for two virtual fish

The bike was ridden in NZ by Murray Delacy, & Ginger Molloy in the Malboro series and is currently seen at the Pukekohe Classic Festival events

[husaberg]

and for two virtual fish

The bike was ridden in NZ by Murray Delacy, & Ginger Molloy in the Malboro series and is currently seen at the Pukekohe Classic Festival events

That was quick and so was the bike for a Harley it's probably the best bike they never made.

[2T Institute]

Not the one you were talking about I thought there was a pic of it on this thread but i can't seem to find it.
but this below is similar ilk to quite a few local buckets.

Brent Jones in CHCH had something similar made in the late 70's early 80's pretty sure this UK version, has been posted before at of the start of the thread though somewhere
Attachment 258605Attachment 258606Attachment 258607
SCITSU
The bike was built by Nick Carpenter UK, it is one of only two produced.
The engine uses a Kawasaki motocross engine, disc valve with Suzuki RG500 cylinder.
Sounds a bit familar doesn't it.

Nice frame though.
Don't know about the carb poking out the side though i doubt it will catch on


Also seen this US one Suzuki 125 . I guess it is a RM125 motor though.
Attachment 258610
This bike is all hand built in 1978 to compete in the 125 gp wars against honda mt 125r, yamaha td and tz in southern california. it wound up being a skunk works project out of suzuki. world champion eddie lawson once rode this bike. (although never raced as he was under contact by kawasaki) the frame is all hand made out of 4130 cromoly and the tank and tail are hand formed aluminum. every part on this bike has been hand formed for the lightest possible weight and function. dry wight is 159 pounds! picture provided by jeff allen.

No that's not it, the RM engined bike a pushbike frame builder fabricated the frame. There is a KX/RG cyl bike running out here but it isn't the fastest, was half way through building one and the the owner got bored with the project and on sold it. Plus I got hold of 2 Rotax 124 engines

The Suzuki 125 in question is pictured here No22 and a earlier model can be seen down the line a bit. I'll have to get my Japanese operative to snap some better pics next time he visits the museum
http://www.suzukicycles.org/All-Suzu...ki_models.html

Click on "Suzuki Vintage Racing" then "GP racer in Hammamatsu" on the left.
The website I'm thinking of was half Japanese/half English but had some great pics

[bucketracer]

Here TeeZee I found Robinsons book in the lunch room library, these are the relevant pages. I think the book is worth having in any ones collection as it seems to cover carburation quite well.

TeeZee, it looks like your on the money.

[husaberg]

Here TeeZee I found Robinsons book in the lunch room libary, these are the relevant pages. I think Robinsons book is worth having as it seems to cover this part of carburation quite well.

TeeZee, it looks like your on the money.

I just spend 20 minutes scanning and putting that together in a neat formatt for Wallace.(Marsheng)
20 minutes at my age is something i will never get back.

Put in the first page for you though.

Random order though sorry, but if you can read the text i am sure the numbers at the bottom so they will give a clue to the order

[bucketracer]

Please post them up, your scans are always easy to read, much better than my effort.

[Kickaha]

but I doubt you would notice it on the dyno even if you did cleverly engineer a straight cut set onto an engine with helicals. . . .

I was quoted $500 to have a pair made to replace the helical gears on the mighty GN, back then it would have bought two more Buckets

[nadroj]

That was quick and so was the bike for a Harley it's probably the best bike they never made.

Is this the rebadged Airmacchi? (sp)

[husaberg]

Is this the rebadged Airmacchi? (sp)

Yes but as they were owned By Harley so it kind of is a Harley.(even thought the Yanks would have had very little to do with it. Other than maybe the colour scheme and the font for the Harley logo.
I think they brought Aermacchi in about 64ish.There was a aircolled version prior to this.
the Italian wing of the company was sold of to Cagiva in the late 70's.Probably Harley got sick of winning world championships by then (6) and wanted to build bikes for cashed up lawyers and Dentists who thought Harley's were BAD ASS. either that or Harley was broke or something.

Wiki

In 1978 Cagiva entered the motorcycle business with two racing motorcycles ridden by Gianfranco Bonera and Marco Lucchinelli. In the same year they bought a factory in Schiranna, Varese from AMF-Harley Davidson and went into motorcycle production. By 1979 the company reached an annual production of 40,000 motorbikes, with eight models with two-stroke engines ranging from 125 cc to 350 cc.

Many of the Harley-Davidson models were continued in production as Cagivas, and the off-road motorcycle division was improved and expanded, eventually producing their own race-winning WMX series of moto-cross motorcycles.
In 1983 Cagiva also sourced Ducati four stroke v-twin engines from 350 cc to 1000 cc and entered the big displacement market. Cagiva bought Ducati in 1985, but kept the Ducati name that was better recognized outside Italy. Ducati motorcycle production continued in Bologna, while the Varese-built Cagiva Ala Azzurra (sold under the name "Alazzurra") and Elefant were introduced, both featuring Ducati engines.^[2]
Cagiva continued with strategic buyouts of Moto Morini in 1985 and Husqvarna in 1987. In 1991 Cagiva also bought the trademarks for the MV Agusta brand.
In 1996, the Ducati and Moto Morini brands were sold to Texas Pacific Group.
In 1999, for strategic purposes, the company was restructured. MV Agusta Motor become the main brand comprising Cagiva and Husqvarna.
In 2000, production of the Cagiva roadster ended
In 2008, Harley Davidson bought MV Agusta Motor, the parent company of Cagiva, thereby regaining some control of their old Aermacchi factory.
In October 2009, Harley-Davidson informed that it will put Cagiva on sale.

The Harley 2008 buy out well i didn't realise that.

Aermacchi Wiki bit

See also: Harley-Davidson Hummer and Harley-Davidson Topper

As part of war reparations, Harley-Davidson acquired the design of a small German motorcycle, the DKW RT 125, which they adapted, manufactured, and sold from 1948 to 1966.^[29] Various models were made, including the Hummer from 1955 to 1959, but they are all colloquially referred to as "Hummers" at present.^[30] BSA in the United Kingdom took the same design as the foundation of their BSA Bantam.^[31]

In 1960, Harley-Davidson consolidated the Model 165 and Hummer lines into the Super-10, introduced the Topper scooter,^[32] and bought fifty percent of Aeronautica Macchi's motorcycle division.^[32][33] Importation of Aermacchi's 250 cc horizontal single began the following year.^[33][34][35] The bike bore Harley-Davidson badges and was marketed as the Harley-Davidson Sprint.^[34][35] The engine of the Sprint was increased to 350 cc in 1969^[33][36] and would remain that size until 1974, when the four-stroke Sprint was discontinued.^[36]
After the Pacer and Scat models were discontinued at the end of 1965, the Bobcat became the last of Harley-Davidson's American-made two-stroke motorcycles. The Bobcat was manufactured only in the 1966 model year.^[37]
Harley-Davidson replaced their American-made lightweight two-stroke motorcycles with the Aermacchi-built two-stroke powered M-65, M-65S, and Rapido. The M-65 had a semi-step-through frame and tank. The M-65S was a M-65 with a larger tank that eliminated the step-through feature. The Rapido was a larger bike with a 125 cc engine.^[38] The Aermacchi-built Harley-Davidsons became entirely two-stroke powered when the 250 cc two-stroke SS-250 replaced the four-stroke 350 cc Sprint in 1974.^[39]
Harley-Davidson purchased full control of Aermacchi's motorcycle production in 1974 and continued making two-stroke motorcycles there until 1978, when they sold the facility to Cagiva.^[32]

When Husqavana was sold to Cagiva some of the engineer's and designers didn't want to leave Sweden. So they formed their own Company they did all right too. You may have heard of the company HUSABERG I think there first factory was in a old Cowshed. They too sold later to KTM in the early 2000's.
But they were built to their own designs.
If you have seen one in pieces you can see why they are beautiful handmade sandcast cases billet this and that's and hand-balanced cranks. Well they were anyway.

A couple of pages missing sorry. They will be somewhere i guess.
And Wow they brought a stake in Aemacchi way before i thought, but not a full amount until later intersting.

Second lot of Attachments
Is an Eric Gorr article on jetting. i am guessing there will be somewhere where not everone agrees with Eric on a point.

[F5 Dave]

Bearing in mind that Eric's article is based on riding MX bikes in the dirt & MX bikes start off as competition models so mods are limited I don't see any problems with generalised comments + also he had a shit load of experience on the MX GP cct & runnnig his business for years.

[TZ350]

F81M Kawasaki's Rotary Valve MXer, early 70's.




250cc 2-stroke Rotary Valve.



Carb has a primary type needle jet with a low nozzel height and removable air correction jet.



Rotary valve cover ..... 30mm carb, carb area 707mm2, port window area 965mm2, 1.4:1 carb/port window ratio.

So now we know that Kawasaki used primary type needle jets in their rotary valve MX racers.

[F5 Dave]

that is trick. Just tickle it up till it looks like the one in the pics & I'll store it for you

[2T Institute]

I'll have to drag my Big Horn engine out.......................

[husaberg]

F81M Kawasaki's Rotary Valve MXer, early 70's.

250cc 2-stroke Rotary Valve.



Carb has a primary type needle jet with a low nozzel height and removable air correction jet.

Rotary valve cover ..... 30mm carb, carb area 707mm2, port window area 965mm2, 1.4:1 carb/port window ratio.

So now we know that Kawasaki used primary type needle jets in their rotary valve MX racers.

I was looking for something today and came across this site it is all about the Kawaskis that TZ mentoned.

Also a page of pressure testing engines and air leaks
http://klemmvintage.com/airleaks.htm

The 350 had the 30mm carb as well and a three ringed piston,

but what was interesting to me was the Decomp.
I had obviously seen them before on old villiers etc and two stroke trials bikes i always thought they were to soften the power and stop stalling plusaid starting.

But this site suggests they are effective engine brakes.
http://klemmvintage.com/Bighorn-Bison-recreational.htm

One thing i always wished a two stroke had was 4 stroke engine braking character.
So i guess one potential downside is it has to be manually tripped and i guess i could swallow the bits as the site sugests
but is this an answer or just creating another potential problem.
What are the downsides to one have they been tried in a GP style engine?
Should i just harden up and stay on the throttle more. Should pull finger and finish my bike.

[TerraRoot]

i wish my fourstrokes had less engine braking, i hate having to brake, gear down and have the hold the throttle open a touch to stop the rear skipping/locking.