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I may be getting older, but I refuse to grow up!
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Depends on the rest of your build and where and how you ride. The +3 TB is good for up to 75-80 HP. You'll need compression, stroker, porting, big valves and HDD5050 big cam to get to 70 HP. To use a 58mm TB with that build may decrease low end torque and throttle response because of reduced velocity. It will also move your powerband into the higher RPM range. To make use of the 58TB you should have at least 14:1 compression, big bore or stroker, HDD5150 cam or similar and of course porting and valves. The 5150 is a race cam and a build with a 58mm would be considered a race build and require race fuel because of compression.
 

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I may be getting older, but I refuse to grow up!
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10,471 Posts
Also a FCI that fits a factory TB, including a +3 will not fit the 58mm TB.
 

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Discussion Starter #4
I'm at 73HP, with port and +1 valve job, HDD5050 Cam, no stroker and 11:1 Piston. Someone is selling me one and i wanted to know if it was worth considering.
 

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I may be getting older, but I refuse to grow up!
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10,471 Posts
I'm at 73HP, with port and +1 valve job, HDD5050 Cam, no stroker and 11:1 Piston. Someone is selling me one and i wanted to know if it was worth considering.
Yes, you could try the bigger 58 TB but I don't think you'll like it. As said, it would be best with 14:1 compression, +2 valves, maybe big bore or stroker, and race fuel. And your existing FCI won't fit.
 

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You’re at that level where the +3 and 50mm are both viable. The 54mm supports 100hp so there is no reason to put a 58mm on your current build.
 
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