Spike25 Posted October 1 Report Share Posted October 1 Does the 33mm retain bottom end power and use a lot more fuel than the 28mm or are they just about the same? Quote Link to comment Share on other sites More sharing options...
skeeter86 Posted October 1 Report Share Posted October 1 Message BansheeHp on here Quote Link to comment Share on other sites More sharing options...
ClaudeMachining Posted October 1 Report Share Posted October 1 Does the 33mm retain bottom end power and use a lot more fuel than the 28mm or are they just about the same? Smaller =more torque, easier to set.Envoyé de mon SM-S908W en utilisant Tapatalk Quote Link to comment Share on other sites More sharing options...
Spike25 Posted October 4 Author Report Share Posted October 4 Thank you Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted October 5 Report Share Posted October 5 What motor are you putting these on? If it's not a 4mm+, then 28mm will be the better option. Quote Link to comment Share on other sites More sharing options...
Spike25 Posted October 9 Author Report Share Posted October 9 I have a 4 mil,421 driveline assassin low port setup with stock carbs. Thinking if it makes sense to port them for a little more power, which ever route I go, I absolutely need to keep my bottom end power, love it when the bike is really snappy. I really appreciate the input, which one will keep it snappy? Especially if ported or left as is? Quote Link to comment Share on other sites More sharing options...
ClaudeMachining Posted October 9 Report Share Posted October 9 I have a 4 mil,421 driveline assassin low port setup with stock carbs. Thinking if it makes sense to port them for a little more power, which ever route I go, I absolutely need to keep my bottom end power, love it when the bike is really snappy. I really appreciate the input, which one will keep it snappy? Especially if ported or left as is?My 421 was an Assassin LP with 33mm.Ask for a nice "clean port", match you cases, good reed valves and go with slp pipes and 28mm.That will be a good "trail friendly" engine.Dunno if 33mm would be a big difference for trail, but it will drink more fuel for sure.Envoyé de mon SM-S908W en utilisant Tapatalk Quote Link to comment Share on other sites More sharing options...
Spike25 Posted October 10 Author Report Share Posted October 10 Gotcha, thank you for the information 👍 Quote Link to comment Share on other sites More sharing options...
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