Author Topic: Mounting a Mikuni carb on my 75 KTM 250  (Read 1006 times)

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Offline Tahitian_Red

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Mounting a Mikuni carb on my 75 KTM 250
« on: January 18, 2017, 04:33:14 AM »
Anyone have problems making this conversion?  I will use a 34mm Mikuni and trim the intake manifold 15-20mm.  Any jetting specs?

Thanks!  :)
The "Factory Novice"
California, USA

'74 Suzuki TM100, '75 Bultaco 250 Pursang, '77 Honda XR75, '77 Suzuki RM125B, '77 Yamaha YZ400D, '79 Honda CR250RZ Moto-X Fox Replica, '83 Honda ME480RD Mugen

Offline Slakewell

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #1 on: January 18, 2017, 05:42:11 PM »
I like the bings on mine , they take some sorting but once they are I like them.
Current bikes. KTM MC 250 77 Husky CR 360 77, Husky 82 420 Auto Bitsa XR 200 project.
Kawasaki A4 125 78 for sale

Offline ozktm

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #2 on: January 19, 2017, 02:30:34 PM »
Running a 36mm bing with new slide/needle/needle jet etc. 76 MC5 250 runs like a champion.
Regards,
Adrian Goold #101

'72 KTM 175 |'74.5 KTM 250 |'74.5 KTM 400 |Hagon/KTM 250 proj|'76 MC5 250 Project |'76 MC5 400|'78 KTM 250 Project |'81 KTM 250 MC | '81 KTM 495 MC

Offline supermotomc

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #3 on: January 20, 2017, 04:13:11 PM »
Bert! would say, why? are you fitting a car carburator to a ktm!!!

Offline Tahitian_Red

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #4 on: January 21, 2017, 06:59:35 AM »
OK.  What is the best place to find rebuild kits and new slides for a Bing 54?  :)
The "Factory Novice"
California, USA

'74 Suzuki TM100, '75 Bultaco 250 Pursang, '77 Honda XR75, '77 Suzuki RM125B, '77 Yamaha YZ400D, '79 Honda CR250RZ Moto-X Fox Replica, '83 Honda ME480RD Mugen

Offline ozktm

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #5 on: January 22, 2017, 03:18:47 PM »
At this stage it depends on the model Bing you are running.
A type 2 Bing 54 (eg 54/38/106 stamping etc, ~42mm dia slide, slide stamp  # 220 or 230 etc), Andre at Enduro Klassiker can sort you out.
If its the earlier type 1 (eg 2/36/102 stamping etc , ~40mm dia slide, slide stamp #1 or #2 etc), i am waiting on a reply from Andre for availability of parts through him for these. Else you can try Al Beuhner at pentonpartsusa.com
I am about to rebuild a type 1 for a guy, hence seeing if available from andre as i am after type 2 parts as well for myself.


Regards,
Adrian Goold #101

'72 KTM 175 |'74.5 KTM 250 |'74.5 KTM 400 |Hagon/KTM 250 proj|'76 MC5 250 Project |'76 MC5 400|'78 KTM 250 Project |'81 KTM 250 MC | '81 KTM 495 MC

Offline Tahitian_Red

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #6 on: January 24, 2017, 04:47:13 AM »
It is a Type 1  :(   Will a Type 2 work on the '74-'76 KTM 250's?
The "Factory Novice"
California, USA

'74 Suzuki TM100, '75 Bultaco 250 Pursang, '77 Honda XR75, '77 Suzuki RM125B, '77 Yamaha YZ400D, '79 Honda CR250RZ Moto-X Fox Replica, '83 Honda ME480RD Mugen

Offline Nebo

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #7 on: January 25, 2017, 05:34:03 PM »
    Yes a Type 2 will work .    For example 54/36/123.  Maico carb.

    Slide 230, main 180/185, Pilot 65/70 .

Offline ozktm151

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Re: Mounting a Mikuni carb on my 75 KTM 250
« Reply #8 on: January 26, 2017, 07:08:09 PM »
If you change types you will probably have to change the intake manifold. I have come across three types. A flush fit from carby to manifold (type 1 ?) ,a plastic sleeve between carby and manifold (MC5) and then the later rubber connection to the manifold.