Roostertail carb

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Thanks for the information,appreciated.
So my obr 29.5 FM LB, came today?
So I guess I'll use 990 since I have it,for the moment anyway.
So I took off the carb on 23(25.4) ESP head and it's running a wt603. Any info on this carb?. I had put the 990 on but haven't tested. The 23 ran rich w/603 but needed tune. So I'll still have to get another carb unless someone says wt603 is good.
I have the 603 on 26 in my fg it works great ?? I did post needle settings for it??I'll find the link??
 
Hands down, the 990 carb will whip the poop out of the 603 on that 29.5. I had a 668 (basically a 603) on my stocker 26 and spent a ton of time tuning on and modding that carb. I finally broke down and got a 990 and it was a completely different engine. I would just retire the 603 and get another 990.
 
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