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Welcome To Harper's Ultrasonic

Carburettor Cleaning

Coronavirus Update

April 2020

During the lock down we can still process some work providing it does not require us to breach guidlines, this means that work can be sent or returned via the postal network and couriers.

Some services such as electroplating, polishing, media blasting and engineering work may be delayed. We are also experiencing longer delivery times on parts from sources overseas and within the UK. At least one parts supplier has announced they will be holding all orders until the lock down has been lifted.

we are anticipating a rush of work once the restrictions are lifted, so please keep this in mind.

Stay safe.


Please Note New Prices for 2020

Our Congratulations to Rider Alexander Pickett on the TC Racing/DP Coldplaning Kawasaki


Copyright - Mick Charnock

The carbs for this bike were cleaned and prepared by Harper's Ultrasonic on behalf of Team Technician, Mick Charnock.

Many thanks to Mick for choosing Harper's to do the work.


Aqua Blasting (wet glass bead) now available through a local surface treatment specialist. See the stretcher casting on the CB750 carbs below


Harper's Ultrasonic is now the UK distributor for Litetek Viton FCR Mid-Body body seals for 39 and 41mm, down and side draft variants. The mid body seals inside the original type of FCR carbs are not available from the manufacturer, a fitting service is available from Harper's Ultrasonic and recommended in most cases due to the nature of the work. See the picture below for a comparison of the new product and failed original seals to see why you may need this service.


FCR Seals with Ethanol Damage and Viton Replacements

The carb which contained these seals was fitted to a 2006 KTM, research has shown that many current models and genuine spare parts are still not compatible with increasing amounts of Ethanol in fuel.

Black Carbs?........No Problem!

We are now offering a weapons grade finish to replace the deteriorated finish on black-painted carbs or change the look of your bare bodies. The finish we supply is ultra thin and very durable, it is applied by spraying without a need for thinners and then baked on for a superb finish. The set of Bandit 1200 carbs below were the first set we have tackled and belong to a close friend, the bike will be featured in our blog when finished.


Suzuki GSF1200 Bandit Carbs in Black Gun Kote with freshly refurbished passivized zinc plated fittings and Stainless Fasteners


We can undertake servicing and repair of motorcycles on a mobile basis in the South Cheshire, North Shropshire and Potteries areas, please contact us for details.

Click Pictures to Enlarge

  Click Pictures to Enlarge

Harper's Ultrasonic Cleaning is a relatively new business with the backing of many years experience with motorcycle repair, restoration and customisation.

We offer Ultrasonic cleaning, overhaul and bench setting of carburettors from Mikuni, Keihin, Amal and most other manufacturers. We are especially experienced with Keihin FCR flat slides, with 18 years of experience on tap. Above and below is a single example of the difference our service can make to your carbs - yes, this is the same carb!

Keihin Special CR, Flat CR (FCR) and FCR-MX Competition Carbs


41mm FCRs Ultrasonically Cleaned and Serviced By Harper's Ultrasonic Cleaning

Keihin FCR 39 and 41mm Flat Slides really are the pinnacle of motorcycle performance carburettor development, so they need to be kept surgically clean to do their thing, this is just as critical to starting and good performance for any type of carburettor from a lawn mower to a classic GP racer.

As well as cleaning and rebuilding, we are happy to re space Keihin Special CR or FCR pumper carburettors to allow fitment to different machines and rebuild either type using genuine Keihin parts. We are also happy to address your needs for any other type of carburettor from Mikuni to Bendix, veteran to modern. We can even help with badly neglected carburettors, let us take a look before you decide to replace them.


Mikuni CVs - the 'Corrosion Challenge' Carbs. These were originally fitted to a Yamaha XS250 Special and arrived in very poor condition, they now serve as a demonstration piece to show customers the effectiveness of our corrosion removal solution

In the meantime if you would like to discuss your needs with us please call Matt on 0775 200 8698 or email

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