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Old 07-11-2010, 07:27 AM   #1
danielson OP
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Joined: May 2009
Location: Adelaide, Oz
Oddometer: 83
Wicked Making of the 10HP Diesel Prime Mover

Hey all

Thought I might show this short build of a Diesel powered motorcycle

The Diesels a 418cc 10HP lump. A clone of a Yanmar made by our Chinese friends.

I've been told by the importer these are the better clones using quality injector, seals and bearings (maybe SKF or FAG?).
Time will tell.

I used an Enfield as the donor bike. They aint that cheap these days but the parts are and widely availability. Thanks Indians probs won't last forever though.

As the whole setup originally has the petrol motor as a stressed member, we went with the original design and made the Diesel as a stressed member too

Had to purchase a Renold 25 tooth duplex sprocket to go on to the output shaft of the Diesel. Its in the BRH corner

Local machinist got it bored out 1" with a 1/4 key way to fit.

A hole was tapped, threaded to fit a grub screw to grab onto the key steel.

First off had to make a backing plate on the gearbox using 5mm steel, 400 by 100 for $7, what a rip off.

2 holes were drilled at opposite sides on the gearbox plate, to make 4.

At the back of the motor is the governor linkage (throttle), it's the beta version, I made an improved one later.

Leveled the rear bracket, placed the motor on it at proper height with the front bracket. Welded on triangles to bolt to the front down tube.

Front bracket made from 6mm steel with 6mm triangles. $10 for 1000 by 200 wide 6mm thick, baargain!!

My bro did all the important stuff; the welding, I did all the cutting, grinding, made throttle and engine kill cables and other bits and bobs.

Had to measure out accurately the 3 holes to drill in the inner primary to bolt onto the motor.

The Diesels output shaft is the same distance from the gearbox shaft as the previous petrols.

Didn't have to alter primary chain at all.

Just eyeball it with the clutch basket sprocket bolt the grub down and your good to go.

That's me ugly mug in the Jackie Howe

All fitted.

Painted the flywheel cover black

Later cut out the all important head steady to get welded.

Can see in the pics below.

Pre units are great

And out in the country

It should hold up well, currently 700kms on it.

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Old 07-11-2010, 07:36 AM   #2
Slightly Less Adventurous
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Joined: Jun 2008
Location: Perth, WA.
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Nice work. Keep us posted.
If it can't be fixed with a hammer, its probably electrical.
2009 Honda CBF1000, 1980 Suzuki GS1000ST (Aus spec), Dr6fiddy,
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Old 07-11-2010, 07:53 AM   #3
woody's wheel works
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Joined: Jun 2004
Location: 39*40'33.86N 104*59'54.69W
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awesome lil project!!!!

kudos to the two of ya

here's another mate of yours down under,,,,a kindred spirit who thinks outside of the box:

OBTW,,,don't let the thread title mislead ya

looking back over the years, i have always been impressed bu the QUALITY of the work as well as innovation coming out of ozzieland and NZ....perhaps it arises out of the fact ya don't have everything at your fingertips

a green tinny or darwin stubby to ya


FYI,,you two have buildt a machine that in a way is very future thinking,,,,,because the wave of the future [starting immediately] is how to conserve ,,,how to recycle,,,how to build longlasting devices,,,how not to get sucked into consumerism and planned obsolesence,,,

you guys are on your way,,i'd open my work-shop any day for you all to tinker in
If you have any questions... Post Em Here
..For more info check our website...
....Wanna e-mail us...
......Wanna talk,,,call us
toll free... 1-866-936-0232
........If you're lost???... GPS = 39*40'33.86N x 104*59'54.69W

woody's wheel works screwed with this post 07-11-2010 at 08:00 AM
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Old 07-11-2010, 12:01 PM   #4
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Location: Tampa
Oddometer: 11,251
Great work

I'm curious what sort of fuel system the little diesel uses (guessing a mechanical pump and indirect injection)? I bet there's a ton more power to be had if you can squirt a bit more in An industrial engine is probably limited such that EGTs won't get crazy if run WOT continiously. On a motorcycle you could get by with a lot more fuel for a short amount of time without melting stuff I think

What's it like to ride?
'09 Buell XB12XT, TL1000S, H1F, M620, CR250R, KX100, XR650R, Cota 315R

Summer 2009 Ride Report
Summer 2008 RR.
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Old 07-11-2010, 01:02 PM   #5
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Location: Land of droughts, and flooding rains
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Love your work Great vision.
And at night the wondrous glory of the everlasting stars.
Quorn Schnitzel club
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Old 07-11-2010, 03:06 PM   #6
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Joined: Sep 2007
Location: Sunshine coast qld
Oddometer: 5,311
Hats off to you for building that.
But you realize what you've started, There are now a crap load adv riders searching the classifieds for an old pre unit bike. Me included.

How much has the finished bike cost you?

I used a yanmar clone to build a hydraulic power pack for my brothers crab boat.
The build of the motor was really impressive for being so cheap.
The strange thing was it really didn't like getting wet I mean just a splash of water over it would cause problems so maybe a better cover over the air filter and some sort of muffler would make it usable in the rain.
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Old 07-12-2010, 01:04 AM   #7
Buckle up SpankY!!
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Joined: May 2006
Location: Emerald Oztralia
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Mate!! Top effort! Any chance you could give some more details on the donk? Like name and who where you got it from??
Built In Shed
Because chrome don't get ya home.
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Old 07-12-2010, 03:22 AM   #8
Little Man
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Location: wollongong South Coast NSW Australia
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Nice one Fella,Great Job!
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Old 07-12-2010, 03:24 AM   #9
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Joined: Feb 2009
Location: goodly satisfactory place, qld
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Well done.
Now where's that old pre unit frame and box i got laying round.
being wrecked by bored and stroked posties....braaaaaaaaaap
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Old 07-12-2010, 03:38 AM   #10
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Joined: Oct 2005
Location: Gizboooooring
Oddometer: 3,015
Thumb Really nice work man

Thats a great bike.

I'd love a wee pokka pokka bike like that for myself. I find myself looking far too often at BSA bantams... Hmmm a diesel beesa banty....
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Old 07-12-2010, 04:03 AM   #11
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Joined: Aug 2007
Location: Maryborough, Qld, Australia
Oddometer: 659
Well done.

I love diesel bikes.

Check out if you haven't already.
99 DR650SE

Ride on, gonna change my evil ways
Ride on, one of these days
One of these days
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Old 07-13-2010, 03:32 AM   #12
danielson OP
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Joined: May 2009
Location: Adelaide, Oz
Oddometer: 83
Thumb Thanks all for the comments

Thanks heaps all for the coms

Thanks woody, that's exactly what the plan was, one may say 'a bike for life' providing the motor keeps going.

Bike Pilot the motor is direct injection. Yep its got a mechanical pump.
I don't about getting more grunt as I've read its a fixed timing motor, its best run a constant 3000 or any other.
What I have seen is people whack on small turbos on these 10HP motors, I don't know bout reliability though.
Heat wise its got a big fan on the flywheel forcing air on the cylinder and head. So the motor gets cooled twice while riding. I don't think it'll overheat.

If you have ridden a 50s British single, its just like it.

Yeah Joe I wish I didn't post this, now all pre units will dry up

Costs all up around 4000 bike included

Yep the motors good for the price. I haven't ridden in heavy rain yet just light, no problems. Interesting though.
The airfilter is nicely covered.


Here's some stats

418cc 86X72
10HP @ 3600rpm
26Nm 1500-3500rpm

Bought from
Tool Power on Epay, a Melburn mob

Bantams are unit construction I think. I reckon B33, B31, M20 or 21 from the Beezas would be good candidates.
You'd want at least 4 speeds.

There are other options, getting a an sheap old japper with a 6 speed, 80s CB250 superdream or the like, cutting the gearbox out and making a separate casing for it.

And you have yourself a nice gearbox. Sounds like a lotta work. This has been done before.

Hey Mick

Yep great site that, lots of good bikes

A few more from todays ride

900kms clocked up so far, running well

I'll have a few vids soon
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Old 07-13-2010, 05:01 AM   #13
05' 640 Adv
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Location: Lost
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Fantastic work Danielson, love it

What sort of economy are you getting, have you had to use anything other than the oily rag stuffed into the intake
Northern NSW
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Old 07-13-2010, 06:41 AM   #14
danielson OP
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Joined: May 2009
Location: Adelaide, Oz
Oddometer: 83
Laugh Fuel Consumption

Clarky mate thanks

I thought I'd get that question first

Currently at 55km per liter, so 1.8l/100km

That figure might improve after running in

Comfortable range of 700km with the current 13.5 liter tank
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Old 07-13-2010, 01:41 PM   #15
now known as many things
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Oddometer: 2,598
far out thats good.
whats the top speed like?
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Originally Posted by tHEtREV View Post
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