Pwk 28mm vs pwk 33mm performance on 421 assassin LP

[Spike25]

Does the 33mm retain bottom end power and use a lot more fuel than the 28mm or are they just about the same?    

[skeeter86]

Message BansheeHp on here

[ClaudeMachining]

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.

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[Spike25]

Thank you 

[locogato11283]

What motor are you putting these on? If it's not a 4mm+, then 28mm will be the better option.

[Spike25]

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?

[ClaudeMachining]

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.

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[Spike25]

Gotcha, thank you for the information 👍