British Standard Triumph 650 to 750 c.c. Big Bore Kit – Lowbrow Customs
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      Here at Lowbrow Customs we believe strongly in supporting US manufacturing. We have created multiple annual scholarships, one with the Lincoln Electric Welding School and another with Tri-C (Cuyahoga Community College) for students in financial need who are pursuing workforce training. From TIG welding to machining, this is the backbone of manufacturing in the United States. Want to learn more?

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      Customer Reviews
      4.8 Based on 19 Reviews
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      • 1967
      David A.
      United States
      I recommend this product

      Awesome Upgrade

      Excellent. Can’t imagine an easier way to go from a 650 to a 750cc motor.

      Gregory T.
      United States United States
      I recommend this product

      Quick Shipping

      This was well priced and arrived super fast! Have not yet installed. Lowbrow is a reliable source for old Triumph parts!

      John T.
      United States United States
      I recommend this product

      Decided to take the plunge.

      My 1967 T120TT was showing low compression on one side (turned out 3 of the 4 compression rings were shattered). Figured why not go big or go home. Very nice kit, everything fit well. Excellent documentation. everything needed is included. Came with the wrong base gasket, but as has been my experience, the Lowbrow crew fixed me right up. Now my old Triumph runs like it's mad at the road. It's great. A++ to Lowbrow's customer service.

      Lowbrow Customs Triumph 650 to 750 c.c. Big Bore Kit Review
      James B.
      United States United States
      I recommend this product

      No Substitute for Cubic Inches

      Opened the box and inventoried the parts, looks like all high quality parts. This looks like a straight forward installation. I can't wait to get started.

      Tony M.
      Australia Australia
      I recommend this product

      Best Service you can ask for

      I am building a 1970 triumph and have ordered all my parts from Lowbrow. The quality is excellent and the speed of delivery to Australia is exceptional. I needed to rebuild the old engine and what better way to start was adding the bolt on big bore kit. Cant thank the team enough for making this custom build the easiest i have done. wish i had discovered them earlier.

      Jared E.
      United States United States
      I recommend this product

      Triumph 650 to 750 c.c. Big Bore Kit

      Price point was great and the kit came to me well packaged. Everything I need cam ready to be installed. Lowbrow continues to be my go-to shop for everything I've needed.

      Keith G.
      United States United States
      I recommend this product

      750 Big Bore Kit

      Great, This kit was a cost saver and motivated by Lowbrow's buying incentives, i.e.. discounts, knowledge and stellar customer service is 5 star. Thanks

      Roger M.
      United States United States
      I recommend this product

      Triumph Big Bore Kit

      My 1967 Triumph Bonneville needed a fresh top end but after three earlier rebuilds it was time for a new cylinder barrel. If I had to get a new barrel, then why not upgrade to a 750. I ordered the big bore kit from Lowbrow and only days later it arrived. Everything included as promised and everything top quality. I can highly recommend the kit.

      David D.
      United States United States
      I recommend this product

      Top Quality. One kit more oomph.

      Excellent British made kit. Building up a 67 Rickman . Basically a street legal motocrosser. Complete engine rebuild. This kit provides all the Piston/Cylinder related parts in one purchase. All designed to work together packed in one neat package with a boost in displacement. The bike will be loud and fast. This helps provide the fast. As always LOWBROW offered a fair price, FAST shipping and great technical and customer support. The online "how to's" are really valuable and informative. If my bride wants to know where the money went, I tell her ' I gave it to some Lowbrow'.

      Matt T.
      United States United States
      I recommend this product

      750 kit

      Still haven’t put the bike together but I’m getting there. The kit seems good. I did not receive all the gaskets though. I only got the copper gasket nothing else. Wasn’t a big deal because I needed a complete gasket set anyways. Over all it seems like a good kit.

      David S.
      United States United States
      I recommend this product

      More Power

      I got everything I need to change my 650 Triumph into a750

      bill H.
      United States United States
      I recommend this product


      is a nice parts good packing 650 too750!!

      Greg C.

      Big bore

      Can’t wait to put this on my bobber!

      Brandon H.

      Nice looking kit

      I purchased this kit because my stock jugs were cracked, the kit seems to be wonderful quality. I gave it four stars because the clearance Grinds for the base studs were not deep enough and I couldn’t get the nuts on half of my studs. Nothing a file and some touch up paint couldn’t take care of. Not sure if it was my base studs being too long, or the part......So four stars it is. Thanks lowbrow for your speedy service

      Patrick H.

      Looks great!

      Shipping was fast and all the how to tutorials on line are helping me get this beast back on the road.! Will order from them continuously!