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4-speed power limitations?

Started by xlfan, November 11, 2023, 01:26:17 PM

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xlfan

How much power can a 86-90 4-speed transmission take?
Is there 10 sec 4-speeds out there?

jsachs1

November 11, 2023, 05:01:17 PM #1 Last Edit: November 11, 2023, 07:54:54 PM by FSG
Quote from: xlfan on November 11, 2023, 01:26:17 PMHow much power can a 86-90 4-speed transmission take?
Is there 10 sec 4-speeds out there?
My 86' Sportster has run in the 10.00 second range with the stock 4-speed trans. The weak, frustrating, issue, is the clutch. It doesn't last too long.
John

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Mattls6

November 16, 2023, 05:22:01 PM #2 Last Edit: November 16, 2023, 07:31:16 PM by FSG
A lot of these guys local to me are running 4-speeds. The track is shorter than 1/8" mile but they'd be running 10s if geared and ran in the 1/4 mile. I forget what fuel they're running but I'm figuring they're around 100hp or so.


jsachs1 - I'm trying to get my hands on those pro streets for my street/strip Sportster. Did you run them wide open?



Handful of hot rod Sportsters and Softails

jsachs1

The person that bought my Sportster in 97', made some changes. Pro Streets, and had me build him a set of wheelie bars. I know the bike is currently for sale. :up:
John