I will not start an engine build without a 100% Deposit on parts! - The remaining balance can be paid upon pickup or shipping of the engine.

Labor - I charge $1500 in labor to build your engine. What does this include? I fully clean and disassemble all parts, Vapor blast the cylinders, head/head cover, top and lower cases, the side covers, as well as ALL internal engine components. I inspect all parts for wear and make sure all tolerances up within spec, or replace the parts if needed. I also micro polish your transmission and shift forks. I use all new stainless steel hardware. The head will receive a new 3 angle valve job. I do not charge extra to install a big bore kit, although having your cylinders bored for oversize pistons is NOT included in my labor. All builds are done using your engine, if you would like to keep your engine we can build you one from our stock. A $400 core charge will be added to the final bill.

NEW Parts - I use all new gaskets, seals, o-rings, copper washer, stainless hardware, cam chain, cam chain guides, sump filter, oil filter, stainless steel rocker arm plugs, 1 piece clutch rod, upgraded clutch throwout bearing, EBC clutch springs, and a 8 pack clutch set up, 5th gear OD, shift shaft, Pamco ignition, HD valve springs, and connecting rods

Estimated parts cost:
Generally $1250 


Hoos Racing 700cc pistons $315 (plus machining cost)
Hoos Racing 750cc Kit $575 (plus machining cost)
Mike’s XS 750cc Kit $790 (no machining cost needed)


Feel free to supply your own parts I will work with you. 


Head Porting - I will do a mild port and polish on your head for an extra $300.

Elephant Foot Tappet upgrade is an extra $100

Upgrade to a Shell One cam is an extra $125


Here is a video of one of our engines One Mean Build!


Iron Heart Cycles 277 Rephased Short Block


This is quick and cost effective for the customer willing to disassemble and reassemble their own engine.


Anyone who is comfortable installing a top end on these engines can have all the hard work done and done right. This Bottom End has all the workings and components we put in our full builds, and is ready for any top end you want to install on it. It has the build quality and components to handle anything from a daily rider to a race bike.
So what all do you get? 


A Completely Rebuilt and Rephased Short Block XS650 Engine


The Following Comes Pre-Assembled for you.


Rephased and Fully Welded Crankshaft
447 Rods
Fully Polished Bearings
Fully Micro Polished Transmission
5th Gear Overdrive Installed (when applicable)
Cases are Vapor Blasted and Fully Cleaned (Unpainted, Beautiful Natural Finish)
New Sump Filter
New Stainless Hardware
New 8 Pack Clutch Setup
New EBC Clutch Springs
New HP Throwout Bearing
New HP Clutch Hardware
New 1 Piece Clutch Rod
New Camchain Pre-Installed (includes Master Link)
New Starter Gear Fix (when applicable)
New Bottom End Oil Seals
New Gaskets
New Shift Shaft Assembly
Electric Starter and all gears pre-installed.
Matching 447 Rephased Camshaft
Base gasket
Head gasket
All Misc. Gaskets Needed for rebuild
All Oil Seals Needed for rebuild
Stainless Hardware Kit
New Side Cover Oil Filter

Cost for a completely rebuilt and rephased short block XS650 engine.
$1750


Here is how it all works.
You will send us your bottom end and camshaft as a core. I ask that you remove the entire top end, pistons, cylinders, head studs, etc.. Keep your engine side covers, cam chain tensioner and tension arm, charging system, chain sprocket and nut. We prefer you ship the bottom end to us on an engine stand (TC Bros makes a nice one) and in a well-protected crate/box. I can help you will the getting shipping setup. The only thing we ask is that your bottom end is not seized or damaged.


We will then ship you our Bottom End as soon as we verify your core as rebuildable. All you have to do is reinstall your top end and go. This can easily be completed in a weekend for most of you people.
If you prefer to have our bottom end in hand before shipping us your bottom end, we charge a $300 core charge which is refundable after we receive your core. We are happy to work with you as best we can.