Jetting for 250

[vntg136]

I have a '77 250 just converted to a reed setup. Could someone suggest jet sizes to get me started, or suggest how much to go up on each jet from stock?
      Thanks very much,
            Bob

 

[john durrill]

Bob . this is from the summer issue of Still Keeping Track.
 Kent Knudson supplied info on a 250 with reed that they use in competion so they should be close for your bike
carb stock 36 mm Bing
160 main jet
283 needle jet
#1 ( 281) needle clip in the middle position
35 pilot jet.
 hope thsi is a help.
John & Peter

 

[vntg136]

John,
Thanks very much. You've saved me considerable trial and error.
        Bob


 

[imported_n/a]

Bob, where did you get the G.E.M. reed?  I'm thinking about adding one to a cylinder, but have no clue where to source one.

Glenn

 

[vntg136]

quote:
Bob, where did you get the G.E.M. reed?  I'm thinking about adding one to a cylinder, but have no clue where to source one.

Glenn

 

 

[vntg136]

Oops - ignore that thing above.

I'm not going to be much help locating a reed block - mine was already on a spare motor that I bought. Seemed like a good idea to use it, since the porting was already done and I like the one on my CZ.
        Bob