Hey I want to go from 883 to the 1250 hammer kit. A friend says that it won't be reliable or it will vibrate apart and will hate it. I'm thinking he's just old school. Anyone with the kit weight in?

 

Sounds like your friend may be jealous....

 

I'm thinking you don't want him to help you with the build.

 

It's a popular conversion in here. Mich has an excellent thread showing you what is involved.

 

I have the kit and it is great, no more vibration than before (maybe a little less) and a ton more power..I say go for it..

 

Definately go for it. 1250 kits are awesome. If you want the cheap route just change your jugs and pistons but if you have more cash and want even more power go for head work and cams. The jugs and pistons alone will give a substantial increase on power.

 

"A friend says that it won't be reliable or it will vibrate apart and will hate it"

[EDIT: I modified my response after I realized the year of your bike]

A "solid" mount 883 engine that's been upgraded to 1250cc will vibrate a touch more than the 883 did by virtue of its heavier/greater rotating mass, but with the rubber mounted engine of your '09 Iron you don't have anything to worry about regarding vibration. In regards to reliability, that will be dependent on the correct assembly of the components, the correct A/F ratio-ECM MAP for the new displacement + any intake/exhaust mods, the correct reassembly and placement of the associated wiring & connections, and last but not least, adhering to the suggested break-in procedure. You should also upgrade the clutch assembly while you're there.

Hundreds, no, prolly thousands of these upgrades have been done over the years via the boring of factory jugs [before the MoCo made the cylinder dimensions thinner rendering oversized bores unsafe, I think in 2008[?]...HINT: buy the assemblies from us] and the installation of 1200cc pistons, or the addition of complete factory or aftermarket 1200cc & 1250cc kits, and they're still running strong.

Definately do it, it's relatively inexpensive and will give you more power while allowing you to enjoy the same insurance premium as your '883...

=8^)

 

I believe I'm going to go with the 100+ hp kit hammer quoted me. Might not be till next spring. Just got to find someone to put it together.

 

That friend must be a certain type of "special"..... Get my drift.

 

I'm thinking of doing this to my Nightster. It's all in who you have do your assembly. Make sure it's someone reputable. They say someone w/ basic mechanic skills can assemble them. I'm going to +1 on the tune. That'll make or break you. Get her on the dyno to make sure it's at the correct a/f ratio etc. Don't want to blow a brand new assembly.