Vintage Dirt Bike Q & A

Howdy guy's,Well am just about ready to start re-assembly on the beast.( that's what I call her)One question (for now.......LOL).Cylinder has has massive port job.Was wondering what would you guy's think would be the best/hottest reed set up to use?Was thinking about the Rad Valve but don't think they make them for this engine.I know this one is going to be one more heck of a air pump.Also what about a carb spacer? yay/nay? I will be running an aftermarket pipe and silencer.I do have a couple more cylinders in case I lose my bottom end from this gutted out hunk of aluminium .What do ya'll think?.Thanks in advance......Swamp BTW Thanks Nathan for the great site.

all cr250 78-01 have the same bolt pattern to screw the reedblock to the cylinder so they all fit to the 79 rocket.
the orign. reedblock has 6 blades, later 4 blade blocks let a bit more air in. don´t know if you really remember it at top end, i don´t.
cheapest way to improove the orign. is to put dual stage reeds on it.
the radvalve will fit into your cylinder but the boot is angled by side.
another intresting reedblock is the tassnari V-Force.
spacers are made to get a smoother down end but loose a little bit at top end. it downs the precompression in the crankcase.

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80 CR250Ra
80 CR250Ra
78 CR250R
80 CR80
82 Bultaco Sherpa 340
78 Bultaco Pursang 250 MK12
76 Bultaco Frontera 370 MK10
76 Bultaco Alpina 250
73 Bultaco Lobito 125 MK6
76 Suzuki RM125A
90 Kawasaki KX250

V-Force drops right in. The spacer lengthens the effective intake tract when the reed petals close. Affects the way pressure waves on the intake side charge the cylinder and crank case.

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Michael Stiles
1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF