3HP & 5HP Flathead size differences?

[Vandoog]

Hey folks, can someone tell me the size difference between a 3hp and 5hp flathead? I'm looking to get more power out of my bike but am not sure the 5hp will fit since a predator did not. thanks!

 

[creia]

This is for the rear mount tank/carb:
H * W L
3HP 11.75" 9" 13"

5HP 13.5" 10" 14"
* When using the shorter "CJ" (or equivalent) sparkplug. For the taller ""RJ" (or equivalent) sparkplug add about an inch.
Michael

 

[old shed finds]

This is for the rear mount tank/carb:
H * W L
3HP 11.75" 9" 13"

5HP 13.5" 10" 14"
* When using the shorter "CJ" (or equivalent) sparkplug. For the taller ""RJ" (or equivalent) sparkplug add about an inch.
Michael

Good job.... This helps lots of us!