whats a good choice of carb for my yz490

[amcfeek]

what type of carb can i hunt for on ebay would a wr500 be better then my 84? or what about a zillas?
anny help thanxz in advance

[rix005]

I purchased a yz 490 today for my Blaster project, from a speed shop on Long Island. I asked the same question as the engine has no carb or boost bottle. He stated that the common application of a 38 or 40 mm would be a little unsavy for a wheeler. Better choice is a 36 mm. and a 6 pedal reed, or any reed at around 68 cfm. NO boost bottle, as most aftermarket intakes prefer not. This setup will give great low and mid punch. Nothing on top. Also if a pre 87, use blue 100 octane avgas to avoid detonation and hard starts. You can lower compression by adding a base gasket but a suptle port timing change will result in carbon deposits. Hope this helps.

[flotek]

get a keihin 38mm airstryker with a long clampon kn filter

[drag lt guy]

38mm or 39mm keihin PWK air stryker is the best carb for all around use.

[blaster 22]

I plan on using a 38mm keihin that i bought new,what baseline jetting should i start with as the stock yz490 had a 40mm and like a 420 main or something.The last mikuni carb i tuned was on my 90 yz250 i use to have back in the day,so im pretty comfortable with the keihin jets.

[blaster 22]

Anybody have an idea..