If I use a Big Bore Kit to upgrade an engine with 33k miles on it, is it like adding a new engine?

 

After 33k miles your engine and transmission will be broken in, if you add a big bore kit the new barrels and pistons will need breaking in too.

After the installation of the new kit follow similar procedures to breaking in a new motor, don't let the revs get too high and don't labour the motor on inclines for at least 1k miles.

 

not totally sure what you mean by this. does it feel like a new engine? absolutely. my '02 883 had 24,000 on the odo when i added a hammer 1250 kit. sure as hell felt like a new bike. old issues that come with age don't disappear.

read up on hammer performance's website about the kit installation, benefits, and other things you may want to replace. i think it gets overlooked, but the clutch diaphragm spring plate needs to be upgraded when going 883 up to 1200/50/75, it's transferring a whole lot more power to the trans, gotta make sure it's strong enough to distribute that power. i used the kit install as an opportunity to freshen up my top end, totally clean all the carbon buildup from the heads, lap the valves, replace guide seals, whatever else made sense to replace while i had it all apart.

 

Also more CCs needs more fuel. Have you included that in your installation?

 

Thanks, I am under the impression that it would be like rebuilding for a new engine with better performance. I currently have 33k miles on the current engine. I haven't visited the Hammer website yet but plan on doing so because I am considering getting one from them. I don't think I am qualified to install one but know the information will be good to know. I have a 2008 1200C that I want to upgrade. You mentioned your "clutch diaphragm spring plate," had to be upgraded. So far I have just gotten information from Youtube, but hopefully at the site I can receive more and be prepared for other changes that I may have to do. I appreciate your experience here.

 

Thanks buddy, appreciate the info.

 

Interesting, no I didn't think about that. Thanks for the heads up.

 

If you've already got a 1200, it might not be worth the expense to gain 50-75cc more displacement. Perhaps some performance upgrades to your existing bike? I went with the 1250 kit when I upgraded my 883, with clearly noticeable performance improvements. I doubt upgrading yours (with the basic kit) would result in such a dramatic difference, but, I could be wrong. Maybe just change your cams and perhaps some headwork and stay at the 1200cc level.

John

 

Not if you have an 91-03 motor to begin with, they use the same (1200) spring diaphragm. 2004 and up have separate clutch spring diaphragms for the 883 and 1200, IIRC.

John

 

You're totally right. Now that I'm thinking about it, the clutch diaphragm spring upgrade is only recommended when ditching the grenade ring with one of those extra plate clutch packs.