1990 FXR - Harley Davidson Forums: Harley Davidson Motorcycle Forum
 
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post #1 of 3 (permalink) Old 08-24-2019, 06:08 AM Thread Starter
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1990 FXR

What is the biggest motor I can put in a 90 FXR frame? Would it also need a larger transmission?
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post #2 of 3 (permalink) Old 08-24-2019, 09:06 AM
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Are you talking aftermarket?

An S&S 124 will fit nicely.

I think Ultima has a 131.

I have an S&S 107 in my 1990 FXRS.

Sent from here to there.

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post #3 of 3 (permalink) Old 08-24-2019, 09:19 AM
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Also the 5spd will work fine but might need a better clutch, Rivera Pro Clutch maybe. AND a much bigger rear tire!!!

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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