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Author Topic: Montessa 250 VR  (Read 7280 times)

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Offline 2 shocks

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Montessa 250 VR
« on: December 29, 2017, 01:21:04 pm »
Would anybody know the original needle jet and needle size for a 1974 - 75 Montessa VR 250, Bing Carby

Thanks

Ken Baker
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Offline Hoony

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Re: Montessa 250 VR
« Reply #1 on: December 29, 2017, 10:13:11 pm »
Contact Ross Nimmo on Facebook Ken, he's your Monty man
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Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
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Offline bigk

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Re: Montessa 250 VR
« Reply #2 on: December 30, 2017, 09:00:46 am »
Contact Jared bates at Southwest Montesa, a wealth of knowledge & a real nice, helpful guy.
K
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Offline cappra

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Re: Montessa 250 VR
« Reply #3 on: January 03, 2018, 06:35:35 am »
Ken,
Bing 11500- 34mm

Main jet- 155/160
Low speed jet (pilot)- 50
Needle jet- 2.85
Needle- 46-281/46-283
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Offline 2 shocks

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Re: Montessa 250 VR
« Reply #4 on: January 11, 2018, 08:25:04 am »
thanks to hoony mick hughes and cappra problem solved
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Offline Nebo

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Re: Montessa 250 VR
« Reply #5 on: January 27, 2018, 12:03:51 pm »
    Would not use this jetting with Modern Fuel.

    It will Seize.
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Offline 2 shocks

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Re: Montessa 250 VR
« Reply #6 on: January 27, 2018, 09:38:50 pm »
What would you recommend ?
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Offline Nebo

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Re: Montessa 250 VR
« Reply #7 on: January 29, 2018, 02:46:00 pm »
  To be Safe  . Go 165/170 main jet.

   Run BP Premium Unleaded 98 Octane. 
 
   32. 1 Mix.  Castrol TTS or Motel 800.

    NGK B9EGV  spark Plug.
   
     Timing should be 2.5/3 mm BTDC.

     Give it run and check for sound of Detonation / Pinging.

     Do a plug reading with a new Spark Plug.
     
     

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Offline Slakewell

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Re: Montessa 250 VR
« Reply #8 on: January 29, 2018, 02:52:34 pm »
With no reed valve motors and Bings, You may need to modify the slide cut away to get that nice crisp off the bottom pull. 
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Current bikes. KTM MC 250 77 Husky CR 360 77, Husky 82 420 Auto Bitsa XR 200 project. Dont need a pickle just need to ride my motorcickle

Offline 2 shocks

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Re: Montessa 250 VR
« Reply #9 on: January 29, 2018, 04:23:03 pm »
al
good info thanks
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