SN build

Joined
Jun 22, 2014
Likes
20
#1
Picked this up Friday night. 650 Protec pipe and head. Pulled engine and found pump only rotates 90 before contact. Mid shaft bearing also locked. Engine spins/strong comp-but no gauge verification yet. 2 of the 4 main Pump bolts were wet. It has Protec ride plate, Protec intake grate, and I assume Protec impeller.

I enjoy surf riding and rec riding. Not looking for wild power.

*Goals -repair pump and mid first
-clean up engine bay
-rebuild engine

*Engine goals - mid range power (budget >$1.5k)

I am leaning toward finding 61x cases-and purchasing a JetManiac ported 701 topend kit. New reman crank will be needed. carb rebuild needed (44 Mikuni on the 650 should work with jet change?).

I also plan on reusing the 650 pipe with a 61x exhaust manifold.
D1582386-AEC1-4368-9661-50066DF96B8C.jpeg 09D4681C-69F0-4556-834F-50415B788FC3.jpeg
 

be_lain

Currently sending it
Joined
Sep 22, 2017
Likes
45
Location
Oregon
#3
Highly recommend the ported jetmaniac top end kit. Just built my 61x over winter and am super happy with it. Also did boyesen reeds and sbt crank. I think I was just over a grand with all that plus some other little things (gaskets, bendix, carb rebuild etc). Add in a head and you’ll be about the 1500 range.
 

be_lain

Currently sending it
Joined
Sep 22, 2017
Likes
45
Location
Oregon
#7
I have a sbn46 but stock bored intake. Just aftermarket reed petals is all. Also if you order your top end from jetmaniac just tell him what you’re running and he provides jets and baseline settings for your setup. They are pretty dead nuts, I haven’t had to deviate from his tuning suggestions.
 
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