gstaten24 Posted January 9, 2011 Report Share Posted January 9, 2011 im not sure if this is the right forum but i was thinking about putting a 421 cheetah cub on my bike with the 4 mil crank and i was wondering if i will be needing bigger carbs for the 421? Quote Link to comment Share on other sites More sharing options...
wacko2000 Posted January 9, 2011 Report Share Posted January 9, 2011 It will run with smaller carbs such as the stockers but it wont run as well as lets say some 35's, the stockers will hold/choke the motor up a great deal. If you plan on a 421, do it the right way or don't do it at all Quote Link to comment Share on other sites More sharing options...
jbirdshee Posted January 9, 2011 Report Share Posted January 9, 2011 The stockers work But not to the motors potential. It is a big difference going with bigger carbs on That motor. Quote Link to comment Share on other sites More sharing options...
Pasi S. Posted January 9, 2011 Report Share Posted January 9, 2011 My friend has That motor with 34PJ´s on gas. He´s going to get some Keihin 39 PWK´s. I´m running 35PWK´s in my ported 3fitty stocker and it runs great. If I had the money for Taht motor I would get 39PWK´s. -Pasi S. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted January 9, 2011 Report Share Posted January 9, 2011 Get 39s rite away there pennis diffrent in price,but a good 421 needs them,all of my boys cubs have 39s on them the one friend who has 35s is selling to get 39s ,do it once doit rite,FAST racing has great prices on carbs Quote Link to comment Share on other sites More sharing options...
crazycanuck Posted January 9, 2011 Report Share Posted January 9, 2011 im not sure if this is the right forum but i was thinking about putting a 421 cheetah cub on my bike with the 4 mil crank and i was wondering if i will be needing bigger carbs for the 421? Yup. Talk to the boys @ FAST and they will set you up with some 39's. And if you decide to go bigger in the future, they will work great for just about any application. P.S you WILL go bigger. period. Quote Link to comment Share on other sites More sharing options...
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