Shop for 35kW(47hp) Restrictors
Why Buy From Us?
Kickstart Engineering, the UK's only recognised motorcycle restriction specialist, has supplied restrictor kits directly to the public and to trade customers since 2010.
Our independently tested restrictor kits are designed, manufactured, and distributed right here in the UK. We have always believed in providing a top rate product and service, at the lowest price.
We are the 'preferred supplier' to some of the UK and Irelands largest motorcycle dealers, franchises, garages and training schools.
Our customer service is second to none, and we always have plenty of stock for immediate dispatch 6 days a week.
Join our thousands of satisfied customers!
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Everything You Need To Know
Restrictors & A2 Law
Restrictor kits allow A2 licence holders to ride a more powerful bike by reducing the power output to comply with the A2 licence law.
Motorcycle restrictors come in various forms. Types of restrictors include metal plates in the inlet(s) or exhaust(s), a throttle stop fitted in the twist grip or on the throttle linkage, and electronic. All Kickstart Engineering restrictors are supplied with a fitting guide (colour photo where applicable) and a 3 part carbon copy certificate of fitment for the installer to complete.
On the 13th of January 2013 the A2 licence law changed from 25kW (33hp) to 35kW (just under 47hp) with a maximum power to weight ratio of 0.2 kW/kg - this is a crank, not a rear wheel measurement. A less well known inclusion in these changes was a limitation on what bikes may, and may not be restricted. We call this the 50% rule. The 50% rule in a nutshell, means you cannot restrict a bike for A2 by more than 50%, so any bike with a manufacturer stated power output of more than 70kW is naturally excluded by this law (age related power loss cannot be taken into account!)
In normal circumstances where the bike is 175kg (dry weight) or over, the bike can be restricted to the maximum 35kW, but what about lighter weight bikes?
Assuming the 50% rule is not exceeded, the bike can be 'over-restricted' below 35kW to get it legally within the maximum 0.2 kW/kg. A great example of this is the hugely popular Yamaha MT-07. With a dry weight of 167kg (depending on year), restricted from 55kW to 33.4kW brings it to 0.2 kW/kg - perfect!
Can you fit the restrictor at home and complete the certificate of fitment? Yes you can! Whilst we always recommend the fitting is carried out by a motorcycle garage, DIY fitment and certification is 100% legal (though the fitter MUST be a 'technically competent person') - but will NOT be accepted by an examiner for an A2 test. For a test bike the restrictor has to be fitted, and the certificate of restriction completed by a 'recognised motorcycle mechanic'. It must be noted that not all insurers accept DIY fitting and certification, so it's best to check with them first!
Training & Test
Using a restricted bike for your lessons or a test? No problem, as long as the restrictor has been fitted and signed off by a 'recognised motorcycle mechanic'. The GOV.UK website states:
"You must bring proof if you’ve restricted a motorcycle to subcategory A2 - if you do not your test will be cancelled.
The proof must:
*be on headed paper
*be from a main dealer, official importer or recognised specialist
*show the motorcycle’s number plate (registration number)
You cannot use a dyno test certificate as proof of the restriction."
