That kit is fine but, there is zero reason not to re bore your existing cylinders
More piston choices , and potentially a more accurate fitment of pistons to bore

 

Right, I understand where your coming from.... I'm all new to this whole bike engines, I know yall were saying not to go any bigger than a 83 cubic inch, with different cam an better exhaust, but could use some info on choosing products an what to do with the heads an all.... motor has 30,000 miles on it, not wanting an all out race engine, just more pull power an with me an my wife riding

 

Give Scott a call. I'm sure he'll bore your cylinders and fit a set Wiseco's for less than that. Call him he'll do you right..

 

As mentioned, your existing cylinders could be bored and reused to save a few dollars. Although if they are starting to show age (highlite on fins or peeling black coating), a new set may be a good idea. And 83 inch is because that is the limit without boring the cases or installing stroker flywheels (longer stroke to get more CI). And while you can get more performance form this engine, realize there is a limitation that maintains reliability.

I'd stick with major brands with S&S being preferred for me, although there are other good brands too. A Wood W6 cam was suggested to improve performance at higher RPM's, but will require a slight bump in compression to get the benefits of that cam. Lifters are necessary as well with the mileage and should be included with a new cam anyway, and I would replace the cam bearing too while in the cam chest. Hillside above would be a good place for head work to compliment the cam and higher compression. I'd check the rocker arms and shafts for wear and replace as needed, likely replace the rocker shafts as a matter of practice regardless. I'm running a Python 2-1 exhaust on my EVO Heritage and it is loud and performs well, but others listed above are good choices as well. I also changed the engine sprocket to a 27 tooth because I always felt like 1st gear would barely get me through the intersection, and at 70+ on the highway it felt like the engine was revving too high.

You didn't mention what carb you are running, but with these upgrades you will need to make some changes there too. I'm running a Mikuni HRS42 and like the throttle response over the CV and S&S carbs, but the slide does rattle at idle, especially with an upgraded cam.

When you assemble the top end, you need to check the deck height on the pistons by installing the new pistons without rings and then the cylinders with head bolts tightened just enough to secure them to see if the top of the piston are above or below the top of the cylinder deck, and then select the correct head gasket thickness to achieve a squish space of .030-.035 between the top of the piston and the cylinder head. Once you have that, you can select a head gasket that will achieve the desired squish. I use Cometic head gaskets and James gaskets for everything else. And, you can use the specs from the cam, bore, stroke and squish to calculate corrected and cold cranking compression, which are nice to know. Before the final assemble, clean everything with warn soap and water to remove any dirt and grime, them use assembly lube during the final assembly.

Hopefully others will chime in with other thoughts and suggestions on how to proceed.

Paul

 

I'm running the factory cv carb, Vance an Hines longshots, adjustable pushrods with aftermarket ignition, an the EV27 cam, motor has around 30,000 miles on it.... just wanting something with a some more power an dependability, nothing extreme

 

Best bang for your buck and bike is contact Scott. He can get you the most power for the best money spent. Let us know what he says. He and Kirby can match compression, cams for your riding style, and carb work you need for what you want and much cheaper than these kits online. BEST BANG for your BUCK and BIKE. Trust these guys, it's what they do.

 

don't want to hi jack your thread but I have a 1998 road king with an evo. i am looking to redo the engine to change gaskets and such. so i thought i might as well get a upgrade and change the jugs. thoughts? im also looking for no machine work but i like to wrench.

 

old thread, I know but hopefully I’ll still get an answer. When you say send the heads to Kirby or Scott, can you provide contact info? Got a stock evo I’m rebuilding and would like to get this done. Thank you.

 

@Snoogan X
It's easier if you fully complete your profile so we know what general area you're in and then there's the First-time visitors Welcome section to HD Forum's, thread. You'll get more responses if you properly introduce yourself. Not many on here like first time posters without proper info and will not respond. There is a way to do things around here. Here's the link,
Welcome Area Only - Harley Davidson Forums

Kirby is no longer a part of this forum and is down in Florida.
Contact - VEE-TWIN Performance Center
Vee Twin Racing • 1450 windy knoll ln • deland, FL 32724
Phone: 386 956 5402

then there's
Larry's motorcycle and Machine I think he's in Illinois.708-598-3050

wfolarry@larrysmotorcyclemachine.com

Then Scott's
www.hillsidecycle.com

Hillside Motorcycle & Machine

5225 S Main St, Munnsville, NY 13409
(315) 495-6650