Originally Posted by
grizz1
Dave - there is a picture of the two different needles I posted half way down page 682. Also go back and read the discussion re short and long needles on pages 676, 677 and 678. That should explain all you need to know.
Tuning tips for the long needle if you have one can be found on the Tech Hope this helps

Thanks for your help, the engine i have is the following R2500-M20HSG (in case another nitro newbie asks the same question) and thankfully for me has a short needle.