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Morini Bicycle Engine Italian made Franco Morini engines are the ultimate bicycle motor. Learn and share how to get the most out of morini motors.

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  #1  
Old 06-03-2014, 06:25 AM
kksbunny kksbunny is offline
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Join Date: Nov 2012
Location: u.s virginia
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Talking Ktm 50 Clutch, Exhaust and Jackshaft

Hey guys I recently placed an order of ktm 50, so i will be getting it in a week!!!!! Cant wait!!.

This is the bike i got http://www.ironhorsebikes.com/hard-tail/2012-yakuza-5-1

Some info about the bike....
1) Engine type: single-cylinder, 2-stroke, air-cooled
2) Piston displacement: 49cc
3) Bore x stroke: 39.5 x 40 mm
4) Max. power: 9HP/9500RPM
5) Max. torque: 7NM/11000RPM
6) Compression ratio: 11:1
7) Ignition: CDI
8) Spark plug: NGK BP7HS
9) Carburetor: 19mm Plunger type carburetor
10) Air filter: polyurethane foam(built on the KTM50 bike)
11) Start mode: KICK start
12) Clutch style: centrifugal automatic
13) Average fuel consumption: 610g/kWh
14) Dimensions: 250x205x290 mm





So my question ....
1. can i use the expansion chamber from sbp as an exhaust
2. What is with the clutch mods...... ( https://www.youtube.com/watch?v=aJ1SYC9aLPY ).
3. mounting suggestion, might use the jack shaft kit!!!! If the engine fits.
4. any other things i need to worry about.



Thanks.
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  #2  
Old 06-03-2014, 09:54 AM
Easy Rider's Avatar
Easy Rider Easy Rider is offline
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Join Date: Jan 2008
Location: Nor*Cal
Posts: 2,130
Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

For your pipe, you'll need a different header pipe. The header pipe slips over the exhaust port. Your best bet is to buy a ktm pipe and retwist it to fit. That's what Headtrama and Nashmoto did. Also you'll probably need to off set your motor mounts because the exhaust comes straight out in the middle of the cylinder or either mount the motor back as far as possible bad have the header pipe bend right after the exhaust port.
Keep us posted on your build.
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  #3  
Old 06-03-2014, 02:18 PM
greaser_monkey_87 greaser_monkey_87 is offline
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Location: USA
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Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

I'm a bit leery of a 10 horsepower engine in an aluminum hardtail.
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  #4  
Old 06-03-2014, 02:28 PM
KCvale KCvale is offline
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Location: Phoenix,AZ
Posts: 3,661
Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

Quote:
Originally Posted by kksbunny View Post
Hey guys I recently placed an order of ktm 50, so i will be getting it in a week!!!!! Cant wait!!.

This is the bike i got http://www.ironhorsebikes.com/hard-tail/2012-yakuza-5-1

Some info about the bike....
11) Start mode: KICK start
12) Clutch style: centrifugal automatic
13) Average fuel consumption: 610g/kWh
14) Dimensions: 250x205x290 mm
You would be hard pressed just to fit a small standard 2-stroke in this bike frame.



I doubt you'll fit that big kick start cent. clutch engine in that frame.
Quote:
So my question ....
1. can i use the expansion chamber from sbp as an exhaust
2. What is with the clutch mods...... ( https://www.youtube.com/watch?v=aJ1SYC9aLPY ).
3. mounting suggestion, might use the jack shaft kit!!!! If the engine fits.
4. any other things i need to worry about.
Thanks.
I haven't seen the KTM 50 engine you bought and there are tons of versions but none look like they would bolt to a SBP 2-stroke jackshaft kit which is really going to leave you screwed unless you loose your back disc brake for a sprocket and go direct drive.

In short it looks to me like you have set yourself up for a project destined for heartbreak.
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  #5  
Old 06-03-2014, 04:12 PM
Easy Rider's Avatar
Easy Rider Easy Rider is offline
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Location: Nor*Cal
Posts: 2,130
Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

I have a buddy that did it 6 years ago (w/o the jackshaft) so any things possible but you should consider using a different bike. If I remember, the biggest hurdle he had was making a set of cranks to clear the motor. You should look at Wild Bill, Headtrama and Nashmoto's builds to get some ideas.
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  #6  
Old 06-03-2014, 04:31 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Location: SoCal, Orange County.
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Default

Quote:
Originally Posted by KCvale View Post
I haven't seen the KTM 50 engine you bought and there are tons of versions but none look like they would bolt to a SBP 2-stroke jackshaft kit which is really going to leave you screwed unless you loose your back disc brake for a sprocket and go direct drive.

In short it looks to me like you have set yourself up for a project destined for heartbreak.
Wild Bill has quite successfully raced a KTM 50 mated to a Sick Bike Parts shift kit.

Sent from my SCH-R720 using Forum Runner
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  #7  
Old 06-03-2014, 06:17 PM
FFV8 FFV8 is offline
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Join Date: Oct 2013
Location: Spring Valley NV
Posts: 551
Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

I have one of those KTM clone engines.

I don't know of any mounting kits to fit one in to a bicycle frame. Depending on your fabricating skills & equipment you may be able to get the engine in that 29'er. It is not a drop-in like the China Girl.

You would need to fabricate a mount set to clamp on to the shaped tubes, or you could fabricate aluminum mounts from 6061 aluminum and weld them on to the frame.

I never had enough patience to sort out that clutch with the spring washers. Be prepared to have the cover off a dozen times, with oil all over the place. I had trouble with the springs binding in the counter bores, and re-machined all of the shoes...

I gave up and installed a Tomar clutch. Problem solved.
http://www.tomarengineering.com/to/h...-mx-bikeshtml/

As Neil said, Wild Bill runs that engine on a shift kit at the races. He shifts it gently. I suspect some WOT shifts would be hard on bicycle chain & parts.
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  #8  
Old 06-03-2014, 06:31 PM
kksbunny kksbunny is offline
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Join Date: Nov 2012
Location: u.s virginia
Posts: 33
Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

Thanks a lot for the info, my bike looks like this right now http://i1368.photobucket.com/albums/...ps8f704767.jpg , do you still thinks that the ktm 50 wont fit? SHOULD I GET A CRUISE BIKE, I HAVE A HUFFY CRANBROOK FRAME. and here is a pics of the engine.
Attached Images
File Type: jpg UT8zMivXhhcXXagOFbXe.jpg (263.1 KB, 225 views)

Last edited by kksbunny; 06-03-2014 at 06:38 PM.
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  #9  
Old 06-03-2014, 06:49 PM
FFV8 FFV8 is offline
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Location: Spring Valley NV
Posts: 551
Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

Here is Wild Bill's build from the beginning:

http://motorbicycling.com/showthread.php?t=46976

His bike works.
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  #10  
Old 06-03-2014, 08:25 PM
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Goat Herder Goat Herder is offline
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Location: N.M.
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Default Re: Ktm 50 Clutch, Exhaust and Jackshaft

Quote:
Originally Posted by FFV8 View Post
I have one of those KTM clone engines.



I gave up and installed a Tomar clutch. Problem solved.
http://www.tomarengineering.com/to/h...-mx-bikeshtml/

As Neil said, Wild Bill runs that engine on a shift kit at the races. He shifts it gently. I suspect some WOT shifts would be hard on bicycle chain & parts.
Tomar clutches for these engines should come mandatory from the factory!! Just got no use ''lowls'' After farting with the stock one. Gave it a go too. Tomar Baby!
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