S&s

[bkrhoades]

Are S&S cases pretty good quality? The reason I ask is I've owned an 87 FXR for about two years now, and I'm thinking about engine upgrades. It's an EVO that already had S&S cases, and an S&S shorty e carb when I bought it. I know nothing about this bikes history, so I would guess that it already has had some upgrades to it. It runs pretty even with the 96ci, so I'm assuming it's not very stock, any ideas?

[springer-]

S&S makes some good stuff. The cases are good quality.

[Hillside]

Originally Posted by bkrhoades

Are S&S cases pretty good quality? The reason I ask is I've owned an 87 FXR for about two years now, and I'm thinking about engine upgrades. It's an EVO that already had S&S cases, and an S&S shorty e carb when I bought it. I know nothing about this bikes history, so I would guess that it already has had some upgrades to it. It runs pretty even with the 96ci, so I'm assuming it's not very stock, any ideas?

With an S&S crankcase, you have a foundation that will allow mucho power to be built.
97", 106" 114", the latter being as big as you can effectively go, and would utilize a 5" stroke. 125hp/125ft/lbs is within easy reach, with power similar to turning a light switch on. Instant!!
Scott

[beuch70]

Originally Posted by Hillside

With an S&S crankcase, you have a foundation that will allow mucho power to be built.
97", 106" 114", the latter being as big as you can effectively go, and would utilize a 5" stroke. 125hp/125ft/lbs is within easy reach, with power similar to turning a light switch on. Instant!!
Scott

hillside,
i got a 90 fxr with a 89flywheels,my cases are stock and are cracked on the oil return,got s&s big bore cases,what do you have to do to make a 106

[rcsoftail]

Originally Posted by beuch70

hillside,
i got a 90 fxr with a 89flywheels,my cases are stock and are cracked on the oil return,got s&s big bore cases,what do you have to do to make a 106

Just did a 106" upgrade on mine last winter. Put in an s&s stroker crank with 4 5/8" stroke. Put in new pistons and cyclinders with 3 13/16" bore. Had to bore my STD cases for the bigger cylinders. Set compression at 10.5:1 and used an s&s 600 cam. I am very happy with the results.

[Hillside]

Originally Posted by beuch70

hillside,
i got a 90 fxr with a 89flywheels,my cases are stock and are cracked on the oil return,got s&s big bore cases,what do you have to do to make a 106

I was about to answer your question, but rc beat me to it.
Your wheels need to be re-balanced for the larger gram weight of the 3 13/16" pistons.(3.8125")
A cam that would prduce more would be a Wood 9B.
Set up correctly, you would have a very stout powerplant.
Scott

[beuch70]

Originally Posted by Hillside

I was about to answer your question, but rc beat me to it.
Your wheels need to be re-balanced for the larger gram weight of the 3 13/16" pistons.(3.8125")
A cam that would prduce more would be a Wood 9B.
Set up correctly, you would have a very stout powerplant.
Scott

i guess im not for sure,what do i do to my flywheels?do i change the rods?then have it balanced.can you use the stock cylinders and have them bored

[blackjackcustms]

Originally Posted by beuch70

i guess im not for sure,what do i do to my flywheels?do i change the rods?then have it balanced.can you use the stock cylinders and have them bored

You will need new flywheels, and new cylinders. You will also need to have your new flywheels balanced to match your new pistons. You will also need to have your cases bored out even more to 4.010" spigots. You will also want to match your other components to your new set-up ( cam, carb, ignition, pipe, etc)

You will love your new 106" if it's done right. The highest horsepower motor I've built so far was a 106" with baisley heads ( STD castings) and a redshift cam. It made 135 hp @ 6200. I am about to install a 139" STD motor that I traded for and rebuilt, and I hope to eclipse this number with it.

[rcsoftail]

The stroker flywheels have the rod journals mounted further out from the center, which gives you the longer stroke. You will use shorter pistons to accomodate your existing factory length rods.