Longevity
Seasoned HDF Member
Joined: Feb 2008
Posts: 22,998
Likes: 11,439
107 for a few bucks becomes a 114 or a 128 or .... It is a Harley changes of those types are easy. The 107 is plenty for most. A quick cam change a canned Power vision tune turns it into a new bike. Parts will be around a long time. Even if for some reason HD is not. My 107 served me well. I made it work harder than most tugging a sidecar.
if you waiting waiting for the prefect bike , prefect buy. It will show up 5 years after you are dead.
if you waiting waiting for the prefect bike , prefect buy. It will show up 5 years after you are dead.
Road Captain
Joined: Jan 2019
Posts: 607
Likes: 143
From: Hilltown
The stroke on the 114 is longer than the 107. The only way to "turn" the 107 into something bigger is with the Big Bore kits. The 114 also has twin counterweight balancers. Also, the "few bucks" that it would take is about $1000. for just the piston and jug kit up to $3500. for a complete stageIV with cam, 64mm throttle body, injectors, lifters, pushrods, and heads.
Last edited by Ridetothehill; Nov 26, 2020 at 09:28 AM.
Grand HDF Member
Joined: Nov 2017
Posts: 4,242
Likes: 3,126
From: Texas
You can also turn a 107 into a 119 (the new Harley Stage III); a stock 114 would turn into a 122 using that same kit.
You can also turn the 107 into a 128, but it's different from everyone else's 128. Most places offer 124 and 128 kits, the 124 is for a 107 engine, the 128 is for a 114 engine. But Harley's Stage IV kit turns a 107 into a 128, and a 114 into a 131.
Road Warrior
Joined: Apr 2015
Posts: 1,535
Likes: 780
From: Manitoba
Me also no plans for bigger at the moment.
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Road Master
Joined: Mar 2017
Posts: 894
Likes: 224
From: Lynden, WA
I would argue a larger engine that makes more torque will last longer than a smaller one that needs to work harder. There is no reason an engine with a 4.250 bore would last longer than one with a 4.000 bore...all other things equal. I would trust a set of S&S cylinders and pistons to last longer than OEM ones.