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Jackson Special 250

Started by stresa, February 10, 2019, 04:13:08 PM

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stresa

Hi guys,
let's start to fill the forum.
Here a few pics of my latest project.
A bike which was built back in 1981/82 in the UK and came to me to Germany in the winter 2017/18.
Bike is based on a YZ250H engine from 1981, frame a modified Honda MB5 one, fork, wheels and fairing of a Honda MT125R. Tank homemade.
Around 40hp, weight is 84,8kg.
A friend solved a few minor and bigger problems and it is now ready to race.





Regards Uwe
81 Jackson Special 250, 2x 74 Yamaha RD250 racer + 1 street racer, 78 Yamaha RD400, 72 R5/RD350, 74 RD250 dirttracker street, 75 Yapol TZ250, 89 Honda RS125,
80 Hejira TM250, RD375/3, 77 Höpfner-TD3, 76 RD/TD3,
74 Yamaha TZ/RD250A, 78 Siroko TZ250, 75 Bakker TZ350B, Tomic 200, Waddon Rotax125

retaRD

Gorgeous!  Tank looks great, too!
Who did the pipe?

stresa

Hi retaRD,
exhaust and tuning of the engine was made by Mick Abbey in the UK back in period. I knew this only as a sticker of him is on the bike and fairing and seat are as raced in the 80tees.
Regards Uwe
81 Jackson Special 250, 2x 74 Yamaha RD250 racer + 1 street racer, 78 Yamaha RD400, 72 R5/RD350, 74 RD250 dirttracker street, 75 Yapol TZ250, 89 Honda RS125,
80 Hejira TM250, RD375/3, 77 Höpfner-TD3, 76 RD/TD3,
74 Yamaha TZ/RD250A, 78 Siroko TZ250, 75 Bakker TZ350B, Tomic 200, Waddon Rotax125

SoCal250

75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)

retaRD

Quote from: stresa on February 10, 2019, 05:57:38 PM
Hi retaRD,
exhaust and tuning of the engine was made by Mick Abbey in the UK back in period. I knew this only as a sticker of him is on the bike and fairing and seat are as raced in the 80tees.
Regards Uwe

Is the seat a Mead Speed item?

stresa

Hi retaRD,
it is a cut down  TZ250/350G seat. It doubt that it is made by Meadspeed as the seat is also from back in period.
Reagrds Uwe
81 Jackson Special 250, 2x 74 Yamaha RD250 racer + 1 street racer, 78 Yamaha RD400, 72 R5/RD350, 74 RD250 dirttracker street, 75 Yapol TZ250, 89 Honda RS125,
80 Hejira TM250, RD375/3, 77 Höpfner-TD3, 76 RD/TD3,
74 Yamaha TZ/RD250A, 78 Siroko TZ250, 75 Bakker TZ350B, Tomic 200, Waddon Rotax125


Kawtriplefreak


SUPERTUNE

Super nice period bike.  :clap: I always see bikes I wish I had here all the time... :vroom:
Chuck
RD machine work, boring, porting, cranks and engine building.


Chuck 'SUPERTUNE' Quenzler III
Team Scream Racing LLC
1920 Sherwood St. STE A
Clearwater, FL. 33765
cqsupertune@tampabay.rr.com

~JM~

MB5 frame? Amazing! Think it would flex like a noodle. Cool bike.

stresa

No clue how it goes on a racetrack. Beside a few metres on a field lane we have not tested it yet. First outing on a track will be on 9th march at a test day in Hockenheim.
But the bike won a lot of races back in period in the UK.
We have another YZ250 bike in the pipeline. Based on a YZ250F from 1979. Hope to have it finished for 2020. It will look like the bike in the pic



Regards Uwe
81 Jackson Special 250, 2x 74 Yamaha RD250 racer + 1 street racer, 78 Yamaha RD400, 72 R5/RD350, 74 RD250 dirttracker street, 75 Yapol TZ250, 89 Honda RS125,
80 Hejira TM250, RD375/3, 77 Höpfner-TD3, 76 RD/TD3,
74 Yamaha TZ/RD250A, 78 Siroko TZ250, 75 Bakker TZ350B, Tomic 200, Waddon Rotax125

toffee

Well your jackson special sure is light at 84.5kg,
I wonder too about that lightweight frame with the 250 engine,
obviously it works if it has some pedigree.

Nice looking period racer.
"An object at rest stays at rest and an object in motion stays in motion..." - Newton's 1st law of Motion

stresa

We had the first real outing on a trackday(Hockenheim) on saturday.
Bike is great to ride. Absolute stable and does what the rider wants. Frame is more than capable to cope with the engine. Engine pulls like a tractor. Now a bit fine tuning like sorting a too rich carb and a too short gearing.



Regards Uwe
81 Jackson Special 250, 2x 74 Yamaha RD250 racer + 1 street racer, 78 Yamaha RD400, 72 R5/RD350, 74 RD250 dirttracker street, 75 Yapol TZ250, 89 Honda RS125,
80 Hejira TM250, RD375/3, 77 Höpfner-TD3, 76 RD/TD3,
74 Yamaha TZ/RD250A, 78 Siroko TZ250, 75 Bakker TZ350B, Tomic 200, Waddon Rotax125