Cylinder

This piston is fitted as standard to late 90's European 500 Bullets. It gives a compression ratio of approximately 6.5:1. It comes complete with rings, gudgeon pin and circlips. Available in Std, +20, +40, and +60.

Suitable for all 500cc Bullets from 1953.

After years of experimenting, we now have available some excellent quality English made forged pistons. These were originally designed for our competition engines, but have now been refined to allow closer bore to piston clearance for road going Bullets. This piston gives a compression ratio of 8.5:1 so is ideally suited for every day use or for those of you who want that extra bit of performance coupled with a strong robust, reliable piston. These are available in 500cc standard and +20. Or why not bore your 500 barrel to 87mm and fit our 535cc piston? They come complete with rings, gudgeon pin and circlips.

Note: We would also suggest a higher grade of fuel is used when raising the compression of your engine.

These pistons are American made, and give a compression ratio of approximately 9:1 with the head gasket fitted (9.5:1 without gasket). They come complete with rings, gudgeon pin and circlips. Available in: +30, +40, +50, and +60 only.

Suitable for all 500cc Bullets from 1953.

Note: If you are using the standard bottom end, we suggest you use a compression plate with this piston to lower the compression. We would also suggest a higher grade of fuel is used when raising the compression of your engine.

This piston gives approximately 8:1 compression and comes complete with with rings, gudgeon pin and circlips. Available in Std, +10, +20, +30, +40, +60 and +80.

An English made forged piston by Omega giving approximately 8:1 compression. Strong, light, robust and extra performance makes it an ideal replacement for the standard piston. Supplied complete with rings, gudgeon pin and circlips. Available in Std, +20, +40, +60 and + 80.

These are the standard style rings. **EUROPEAN MADE**

These are the standard style rings. **EUROPEAN MADE**

Note: NOT suitable for the Electra (X) or Electra EFI, Thunderbird and Classic EFI.

For lightness and better heat dissipation. Please note that these cylinders have been through our own stringent 10 point check and rectified in various areas to ensure they are what we consider to be of an acceptable quality. This now includes a steel insert for the thread between the pushrods to replace the standard helicoil.

We also stock unchecked alloy cylinders which have tolerances outside our preferred standards. Whilst Hitchcock's do not use or endorse these, they do offer a cheaper alternative as a basis for improvement.

This big bore kit includes a forged piston developed by Wössner pistons in Germany in conjunction with Fritz Egli and Jochen Sommer. It gives better performance and very good torque. It is supplied with a replacement cylinder head gasket and increases the engine size to 535cc with a compression ratio of approx 8.5:1.

For lightness and better heat dissipation. Please note that these cylinders have been through our own stringent 10 point check and rectified in various areas to ensure their quality. This now includes a steel insert for the thread between the pushrods to replace the standard helicoil.

We also stock unchecked alloy cylinders which have tolerances outside our preferred standards. Whilst Hitchcock's do not use or endorse these, they do offer a cheaper alternative as a basis for improvement.

For lightness and better heat dissipation. Please note that these cylinders have been through our own stringent 10 point check and rectified in various areas to ensure they are what we consider to be of an acceptable quality. This now includes a steel insert for the thread between the pushrods to replace the standard helicoil.

We also stock unchecked alloy cylinders which have tolerances outside our preferred standards. Whilst Hitchcock's do not use or endorse these, they do offer a cheaper alternative as a basis for improvement.

These are made out of alloy and are available in either 2mm or 3mm thickness. Can be used in conjuction with 42877 piston or any high compression piston to lower the compression.

Comprises of large bore cast iron or alloy barrel and completely redesigned piston to give a new engine size of 535cc with a choice of compressions. This is a direct replacement for the standard barrel, but will also compliment the tuned cylinder heads that we offer.

Note: that the alloy barrels used in our big bore kits are the ones that have been through our 10 point quality check.

Finally a big bore kit for the 500 Electra to take it out to 535cc. It has taken a couple of years to develop but we now have a design and piston that performs well. At a compression ratio of approximately 8.5:1 and the extra 35cc engine size it gives the extra performance you are looking for. With the benefits of a strong, robust and reliable forged piston, it is an excellent improvement. You can either bore your 500 barrel to 87mm and fit our 535cc piston or have a matched cylinder and piston -- They come complete with rings, gudgeon pin and circlips.

These English made piston rings are made up of several rings for each groove. They give better compression and oil control especially if you have a worn bore.

Note: The manufacturer has now discontinued the Bullet range of rings, so stocks are limited.

A centrifugally spun European made cast iron liner suitable for use in the cast iron cylinder barrels.

Most Royal Enfields use a standard wire circlip. These are not the easiest to fit and remove. We have produced a batch of the correct specification wire circlips but with the tags as shown in the picture.

Please note: These are to be fitted to the standard pistons only, they are NOT suitable for our aftermarket forged pistons.