The Cyclery IOE Cylinders
- Cylinder set »Ricardo Racing« by The Cyclery
- fits 61” /1000 cc IOE models 1924-1929
- cast iron, cast finish
- nominal bore: 3-5/16 ”
- Australia
- gross weight: 20 kg
Protect your valuable and irreplaceable original crankcases from worn-beyond-repair original cylinders (a.k.a. time bombs). These accurate reproductions are cast from state-of-the-art alloys to modern specs and stand up to all horsepowers you can pack on an IOE lower end. Now you can finally have both that stock factory look and a safe engine. Racers around the globe use them with great success for years. Sold as pairs only.
61”/1000 cc Ricardo Racing 1924-1929
These special Ricardo straight fin type racing cylinders feature large cylinder flanges for later 1924-1929 crankcases. To enhance performance they have both intake and exhaust ports machined for the larger 74” nipples and they accept special intake housings (= 61” style OD and 74” style height) for improved flow. Bore is stock with 3-5/16” bore for 61 cui./1000 cc displacement.
Harry Ricardo
Presumably in the year 1915 the Factory hired Englishman Harry Ricardo to improve the performance of the then new 8-valve overhead race bikes. Harry was the leading freelance theorist and practitioner in the young science of cylinder head flow physics. His work immediately proved successful with important race victories in the following year. This consequently led to numerous fruitful cooperations between Mr. Ricardo and Harley-Davidson, which were extended to IOE and sidevalve engines, too.
Exhaust valve seats are unmachined.
Cylinders which are not offered as complete kits, i.e. with pistons and rings, are not finish honed. This job must be performed in a qualified workshop.
Accessories:
60-879
63-724
Gaskets for Cylinder Base: 61 cui/1000 cc IOE 1924-1929, 74cui/1200 cc IOE, Knucklehead, Sidevalve Big Twin
See also:
The Cyclery Vintage Rider Caps
The Cyclery Front Fenders for IOE Models
The Cyclery Socket Wrench for Exhaust Nipples
Have any questions?
Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com