I'm thinking about upgrading my bike from the 95 to the 103 with the 4 3/8" stroker but after looking at it i would need to buy new pistons also because it says my SE forged high comp pistons won't work with the longer stroke, but it also says i could use the pistons for SE Forged High-Compression Pistons for stock TC 96 heads or Kompressor Heads to get me 11:1 comp instead of my current 10.5:1
Does this mean the 96 has the same size bore as the 95 jugs? Would the below parts work in my bike?
Stroker assembly 23600-00A pistons 22144-08B

I have a 2001 FXDX I have the SE kompressor heads, 44mm CV carb and SE 257 cams

 

3.875 is the bore size for a 95" and 96" configuration. You can get to 103" with that bore and the 4.375" crank. You can find a variety of pistons for that configuration. No comment as to whether the listed parts will work for your plan; do the homework we all have to do when planning a build.

 

Actually, the bore size is the same for 88" and 96" and then the same for 95" and 103"

The difference is the flywheels and bore combinations.

88" flywheels with bigger bore = 95"

96" flywheels with bigger bore (same as 1550) = 103"

103" flywheels with 88" bore = 96"

103" flywheels with 95" bore = 103"

 

bore sizes may be the same for 88/96 & 95/103 but pistons are not interchangeable from a 4" to 4.375" stroke,i advise using a S&S 4.375 FW & a 107"CP piston kit,we`ve done this build on earlier motors (A&B) many times

 

Quoting my own post to correct an error which both Ed and Kirby have pointed out. As long as I have been working on Harley's and building motors I still have a brain fart from time to time: my bad.. Thanks to Ed and Kirby for the catch and correction.

 

When HD stroked the TC motor to 4 3/8" they didn't change cylinder length, rod length or case deck height. They changed the piston compression height (piston pin center to piston top) from 1.270" to 1.090"

 

And if going to a 4 3/8" arm, a simple machining operation of boring the cases, and a set of S&S 4 1/8" cylinders shows 117".
Another one left here Friday, back to NH.
135/143.
Scott

 

I’ll be the red guy on your shoulder whispering, “Go 124”.

You’re just looking at the extra cost of cylinders now. Do the timkin conversion, and with the S&S lower, cylinders, and pistons, you’ll have a buillet-proof foundation. You CAN build a mild 124 that will put out just as much power as a high strung 107.

Dave

 

 

Our 117"s produce more, with stronger delivery, than a LC 124" crate.
Scott