gusto Posted March 14, 2023 Report Share Posted March 14, 2023 I have a 421 HJR dune port serval with 33 pwks in my parts bin i was going to build up. I thinking of changing to a play port stock stroke stock cylinder and going back to stock carbs in an effort to get more seat time before fill ups. Question to the guys who have played around with engine set ups, how much more gas will be burnt with a 421 serval with 33s and CPIs vs ported stock stroke and 26s? Quote Link to comment Share on other sites More sharing options...
Tedder Posted March 14, 2023 Report Share Posted March 14, 2023 My son has a heavily ported 421 serval with bored 39 Keihins and it's a gas hog. It's a bad ass runner but only gets 50 miles out of a tank. Quote Link to comment Share on other sites More sharing options...
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