Replace for following size: 10-12.5-15-17.5-20-22.5 25-27.5-30-32.5-35-37.5. Total length 28mm Thread:M4.0x0.7mm Fits: Fit For Mikuni HS40, HSR424548, RS34-RS40 and TM33, TM36 and TM40 with accelerator pump. NOTE: This Brass Pilot Jet is not original parts, the mention of brand names and any related model designation above is only for purposes of demonstrating compatibility. Please double check the part number of your item,matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return. The picture can tell more than we can, what you see is what you will receive,please make sure it will fit your machine before bidding it. Please check pictures for more details.