I purchased the CV jet kit from Sorgys for my 2002 Dyna and got it installed this past weekend. The stock jet sizes on my 2002 Twin Cam were 45 for the slow jet and 190 for the main jet. I supplied my bike setup to Sorgy (2002 Twin Cam with K&N air filter and Cycle Shack exhaust pipes). My jet kit came with replacement jet sizes of 48 and 195.

Before I got the replacement jets, I had removed the metal block plug from the idle set screw tube and moved the idle screw from the stock position of 2 turns out from closed to 2.5 turns out from closed. I felt that was the best I could do with stock jets. Low throttle response improved bike performance but I felt that the carb was still running lean (plugs looked bone white).

After removing the air cleaner cover, air filter and mounting plate I popped the carb of the rubber manifold mount and tilted the carb bottom up to expose the float bowl. I was glad I used a good quality philips head screwdriver to remove the 4 stubborn screws that held the float bowl. I removed the two stock jets and put in the 2 replacement jets. The kit came with 4 stainless steel screws with lock washers to replace the philips screws (nice!).

After starting up the engine and letting it warm up, the idle was re-adjusted to be 1.5 turns out from closed position. Before the new jets, the best idle screw position was 2.5 turns out from closed.

Now with the new jets, roll on power is more immediate and decel popping has decreased significantly. Very nice responsive feel through all throttle positions. The bike also warms up more quickly. I'll run through a full tank of gas and report what the new MPG is (stock jet delivered about 47 MPG). MPG is not a big deal for me but knowing the change in MPG will be good to know. I'll also pull the plugs then and hopefully there will be some tan color on the plugs.

The Sorgy's kit came with two replacement jets, 4 stainless steel hex screws with lock washers to replace the screws on the float bowl and excellent directions with pictures. Jet kit cost was $16. Excellent instructions along with jets for the bike you ride make this kit a very good deal, IMHO





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Many people Love the CV, and just a couple of tweets and you can have some real fun!
I know its better that I ever gave it credit for. Doug at HQ runs them on his 113 in bagger and states that the milage is over 50 mpg! and the bike has 130 lbs of torque!

What and underdog!

 

Good info , and nice writeup.
You have found how nicely the stock carb takes to tweaking , and you may find , like I did that the mileage may go up as you get closer to perfect.
If the plugs look lean now , you might want to raise the needle a pinch to fatten up the midrange.
I used a couple of #4 machine washers under the needle , and it helped a little.
The sportster needle (in my sig) worked even better than the shims.
The stock carb can work really well with a little TLC as you've found.
I got my setup from plug reads and fuel mileage , and am very pleased.
Mick

 

Thanks Mick!

I will definately keep the Sportster needle option open after I get some time with the current jets. What amazes me is how easy and affordable the carb upgrade was. Feels good doing it yourself.




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With the stock jets mt MPG was 47. Refilled yesterday and with new jets my MPG is 42. I believe this is a fair trade for more performance in all throttle positions.



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