Motorcycle carburetor

overhaul and restoration services

General information

Motorcycle carburettors: Comprehensive Clean and Part Restoration (Picasa Gallery - opens in new window)

JRS Comprehensive clean - more than just a clean!! (Picasa Gallery - opens in new window)

Motorcycle carburetors: Keihin, Mikuni, Bing Amal etc.

The JRS mail order carburetor overhaul service has been offered for more than 10 years. The majority of customers are private individuals but work is completed for a dozen or so of the major UK motorcycle trade retailers who do not have the time or possibly the equipment and resources to complete such work properly. 

This range of services has now been amended and improved to reflect the increasing amount of work being received from owners of modern motorcycles.  Whether you are the owner of a 1970’s classic, or an R1 or Fireblade, JRS can provide overhaul/cleaning and/or restoration services that will ensure the optimum carburetion and performance from your machine.

Choose from the services listed below and be assured that the quality of service and the workmanship that has always set the JRS apart from the rest is as good as ever.

From the start of this business, JRS has used ultrasonics as the means of completing the cleaning element of the overhaul. No acids or aggressive chemicals are used. No silly little ultrasonic baths are used either!! Industrial quality equipment, time proven methods, years of experience and an enviable record for good workmanship and service is what JRS customers have come to expect.  

JRS completes carburettor work and nothing else.  The range of carburetor work is limited to motorcycle carburetors and selected performance car carburetors. This is our area of expertise.

JRS has probably overhauled most makes and types of motorcycle carburettor over the years. Regardless of year, make or machine, they all get the same care and attention. Although the motorcycle carburettor services are predominantly used by owners of Japanese machines or Japanese carburetors.  JRS provides the same quality of service for Dellorto, Amal and Bing instruments.

The problems associated with poor carburettor performance display themselves in a variety of ways. A carburettor contains as many as 4 different fuelling circuits within each unit and to obtain seamless fuelling over the entire engine operating range, it is important that all of the systems work as designed. Each system, possibly other than the cold start, does not shut off at some predetermined point where the next circuit takes over, but they should all blend. Thus fault diagnosis is not a simple affair.

Carburettors left for as short a period as three months with a supply of fuel to them will get into a mess very quickly. The jets are relatively easily cleaned but the real problems lie within the body of the carburettor and aerosol sprays and the like will simply not remove them. Imports from Japan and the USA are renowned for this problem and these problems are further compounded by the strange fuels that they use in those countries. In the UK, modern fuels separate out in as short a period as 30 days, so lightly used machines suffer badly.  Modern machines are particularly susceptible to fueling problems of this sort. 

The other issue that affects performance is the quality of maintenance.  Over the years many hands will have worked on your carburettors and indications at JRS are that abysmal maintenance is every bit as much of a problem as fuel residues.  Whether carburettors have problems or not, their operational efficiency depends to a large extent on their being in optimum condition and this is understood by those who require optimum peformance from their machines. Owners and riders of competition machines use JRS to attend to their carburation needs on an annual basis.

If your carburettors are giving trouble, you may consider that replacement with a secondhand set would be preferable to cleaning. Please remember: There is simply no way that the operational efficiency of the carburettors you may purchase can be assessed from their appearance. You may yet end up with carburettors that are worse than the ones you already have.(See the Buying Secondhand Carburettors section on this website)

The generally accepted rule is: If you know the carburettors worked well at some time in the past and that they have not been damaged since, keep them and get them overhauled.

Lastly: not all overhaul services are the same: costs and more importantly standards of workmanship and service vary enormously. Rebuilding or restoration should be a once only requirement. So get it done by a competent and reliable firm.

 

Tel: 01792 402458
E-mail: jrs@jrs.uk.com