OzVMX Forum

Clubroom => Tech Talk => Topic started by: head on April 27, 2011, 09:50:28 pm

Title: Dellorto Jets
Post by: head on April 27, 2011, 09:50:28 pm

I am running a Dellorto VHSB 38 QS Carb on a 500 4 stroke. I have managed to find some main jets of Ebay. I would like to try a #258FN needle jet and a pilot jet smaller than a #33. Tried Ktm for the pilot and they only went to a #33 which is what I have. Bike starts with no choke. I am thinking the smaller needle jet might help by closing the hole up between needle and needle jet when throttle closed. I know mikuni sell different size needles at the non tapered end which effects the pilot circuit, I am thinking of trying to get same effect if a #33 pilot is the smallest I can buy. Is anything smaller available. Any help or knowledge would be appreciated
Cheers Neil.

Title: Re: Dellorto Jets
Post by: Freakshow on April 27, 2011, 10:12:02 pm

PM your details

Title: Re: Dellorto Jets
Post by: JohnnyO on April 28, 2011, 07:31:32 am

Try a Ducati shop, i've purchased different tapered needles and a range of jets from the local Ducati shop for my Dellorto carb.

Title: Re: Dellorto Jets
Post by: Lozza on April 28, 2011, 09:13:22 am

Green Flag Karting in the US. Dellorto's are a size jet so you can solder and redrill to size. You will be using a K series needle and undoubted you will be using a K53 to 55. I have never changed the needle jet. Your  local Kart shop will have jets 160 to 180 (also K27 and K92 needles) for $5 as they are the only homologated jets/needles. VHSB has a transition jet from pilot to needle but seems to make no difference.