I hear a lot about 883 to 1200 conversions but has anyone ever tried one of these on their 1200?

1474cc 90 inch Monster big bore kit, for Harley Davidson evolution Sportster and Buell 1986 and later

This top end set will create more horsepower and engine life due to their cooler running temperature

This is the best high performance top end set available

Cylinder and piston kits come complete with one piece, all aerospace grade aluminum nickel-silicon carbide plated bore cylinders, complete forged piston kit and cometic head and base gasket kit!

3 7⁄8 inch bore millennium technologies Revolution cylinders
10.5:1 forged pistons, pins, clips, rings head and base gaskets

CASE BORING REQUIRED

 

There is a good handful of 88" 90" builds on xlforum right now. I believe you need good head work and big cams to take full advantage of those builds

 

Hastings says they are to be used with Buell thunderstorm heads but sportster heads will work. You have to by stock sportster rods and they say the only other thing you need is that the case has to be bored for the bigger jugs. Stock cams should work but you are right, to take full advantage of the conversion new cams would be
needed.

 

id rather buy a bigger bike, then you have two bikes to customize lol

 

Not a bolt-on, big money and lots of headaches.

 

[QUOTE=jojoenglish85;11352932]id rather buy a bigger bike, then you have two bikes to customize lol[/QUOTE

Yeah, but I have always been kinda like Tim "TheToolMan" Taylor. Gotta give it more power. Besides a bigger bike is just a bigger bike. It may have a bigger motor but it won't handle like a sportster.

 

You're right it is not a weekend project. The kit cost around 950.00 and you have to buy rods separately. The case has to be machined for the larger cylinder so the engine has to be completely disassembled. But it's something to ponder.
Oh yeah, stop teasing the rabbit.

 

I'm glad you brought this up, I saw or heard someone else mention the 90" conversion for the 1200 but I didn't know how it was accomplished, thanks for educating me.

 

Consider if you are splitting the cases.....assembly, disassembly, everything comes out of the engine, Tran and primary. The 88" 90" motors put out some very good tq numbers too. A hoot to ride. A cheaper version with less power, but still up there is a hot 1250 build. No bottom end work required. You can have it done in A/V weekend and not break the bank.