OzVMX Forum

Marque Remarks => Spaniards (Bultaco, Ossa, Montesa etc) => Topic started by: 2 shocks on December 29, 2017, 01:21:04 pm

Title: Montessa 250 VR
Post by: 2 shocks 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

Title: Re: Montessa 250 VR
Post by: Hoony on December 29, 2017, 10:13:11 pm

Contact Ross Nimmo on Facebook Ken, he's your Monty man

Title: Re: Montessa 250 VR
Post by: bigk on December 30, 2017, 09:00:46 am

Contact Jared bates at Southwest Montesa, a wealth of knowledge & a real nice, helpful guy.
K

Title: Re: Montessa 250 VR
Post by: cappra 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

Title: Re: Montessa 250 VR
Post by: 2 shocks on January 11, 2018, 08:25:04 am

thanks to hoony mick hughes and cappra problem solved

Title: Re: Montessa 250 VR
Post by: Nebo on January 27, 2018, 12:03:51 pm

    Would not use this jetting with Modern Fuel.

    It will Seize.

Title: Re: Montessa 250 VR
Post by: 2 shocks on January 27, 2018, 09:38:50 pm

What would you recommend ?

Title: Re: Montessa 250 VR
Post by: Nebo 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.
     
     

Title: Re: Montessa 250 VR
Post by: Slakewell 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. 

Title: Re: Montessa 250 VR
Post by: 2 shocks on January 29, 2018, 04:23:03 pm

al
good info thanks