The Twin headlight Ernie clutch arm mod. Works on all model KLR650's. Old and new generation. The standard factory arm is on the left. The mod arm is on the right.The modded arm lightens up the clutch pul by about 30% and increases the friction zone making the bike easier to ride. If you've ever thought of converting to a hydralic clutch this is a far less expensive substitute. I have this mod on my own KLR and it is the best bang for the buck mod on the bike ever. Cost is $35.00 plus shipping and exchange of your old clutch arm as a core. E-mail me at firstname.lastname@example.org to order.