There are drop-downs under some of the buttons. Just hover your pointer over them for more selections.
We do custom sizes. Here are some sample sizes. Keep in mind that with a stroked crank any size Virago (from 700 up) can go to the maximum.
The first iteration of this website appeared in late 2014. I had an '82 chain-drive and wanted to go fast. I looked around and there was nothing designed for these bikes. I saw that Viragos are almosat identical internally and decided to branch out. I looked around. Pistons were made to order and cost as much as a thousand a pair. And they weren't shaped right for real power. Cams were a little better, but the specifications were too short and too low. I pulled together some cash and created Big twins LLC. Acquiring all the documents took some work and some visits to city hall and the tax board. I sent thick slabs of documents to every vendor and manufacturer I could think of. Most wanted me to send them pictures of my store; inside and out. My inventory is on racks out in the driveway under a tarp. Needless to say, most vendors gave me a pass. I did take a buch of pictures of a friend's dyno room and work area for limited distribution. As a result, I believe that I am the only one-man merchant for ProCharger, Athena USA, and some automotive concerns.
I drew sketches and made molds. I sent pistons and rods out. I calculated airflow against cam timing and lift. I got some good responses. Business grew and I found that most of my sales were overseas. For the TR1, a motorcycle I have never seen. But airflow is airflow; the calculus is the same.
A year or so ago, my piston supplier was absorbed by another concern. Suddenly I had to tell people that I lacked the heart of high performance and sales disappeared. I approached some manufactureres and told them I had no store, but I sold all over the world and dared them to supply me. Two took me up. Working from samples of stock and modified pistons, they offered their products. Two years ago piston kits were five hundred dollars a pair. Now the cheapest is almost seven. Business has restarted, but slowly. Where I was selling two to four sets a week, I now see a set a month. It astonishes me. There are many bikes that are in my realm. I am the only source for specially designed goods on the planet for these bikes. This is a last refuge for those seeking performance for their '80s vintage XV series bikes. The site bigtwins.org provides what knowledge that I am able to produce on a as-time-is-available basis.
I probed performance parts for the mega-cruisers: the XV1900, the M109R, and the Thunderbird Storm. Indian and Victory are well covered by Lloydz. The site gets many visitors, but I have yet to get any queries. The major problem is that every Double Liter twin needs portwork to perk it up. This is _very_ expensive and labor-intensive both for the portsmith and the mechanic (usually not the bike's owner). I suppose that stock power is enough for the riders. What can I say? I like to have power from idle up past redline. A ten second twin is a real kick in the pants and a true fooler for the competition on their hyperbikes.
There are no "Add to Basket" buttons - tell us what you want and what you want to do, and we'll discuss practicality and price. Once everything is to your liking, we shall send you an invoice and you'll soon have your parts. Alas, Arias and the days of five hundred dollar pistons are no more. Pistons are again available, but more at the price of those for vintage motorcycles. Take a look around and decide if it's worth resurrecting your sled. It's not as bad as it sounds and the quality - if anything - has gone up. Click the buttons repeatedly for more choices; for example, if you are on the "Pistons" page, click the Pistons button for further choices in displacement and such. If the text is red with a halo, click it. I'm sorry about the glitchiness on smartphones; I am working on fixing it. White words in normal pararaphs represent links to the information site for fuller explanations of terms we use and concepts we wish to convey. This is meant to better arm you against bad technique or poor judgement, or simply to re-affirm your knowledge of the material covered. Oh - here's a few of our vendors. How power is made.