Bikes and De-restricting..what is it?

Supercell

Have seen several posts where de-restricting has been mentioned, reading these it seems apparent that this means (i think ) that some engines though they are more powerful may be manually "restriced" to a lower cc rating? Is this correct?

If so, how does one know what is a bigger engine than rated, and also if you desrestrict a big engine, and you bump into a car, surely this invalidates the insurance?

Eg my Virago 125, engine looks huge for a wee 125..is it possibly a biger engine that the manufacturer has restricted for simplicity of marketing (rather than engineering a whole new smaller engine)

TBH wouldn't restrict this even if it were possible as the power suits me fine atm, don't think i'm a skilled enough driver to handle much bigger , and thats afer over a year of driving, but maybe i'm cautious, and showing my age (probably why my insurance is ~£450 comp on a provisional license living in Dublin city centre).

So what does de-restricting mean..supercharging a small engine, or releasing a bigger one?

dogs

Restricting doesn't affect the cc of the engine. It's to
do with how much power the bike outputs. If you're driving
on an A licence, you're restricted to no more than 25kW or
about 33bhp. Your XV125 puts out about 10bhp, and AFAICR,
the XV250 puts out about 15bhp, so it doesn't really affect
you. As for getting more power out of your bike, I suppose
you could get it bored out or something, I dont really know
that much about these things Not sure why you'd want to
though. If you want something bigger, get a bigger bike
As for insurance, power output isn't something that can
be tested at the side of the road. Gardai don't have bhp
checkpoints Insurance companies charge you regardless
of what restrictors you have in place. I got quoted £3000+
on a CBR600F, when I told them it'd be restricted to no
more than 33bhp, they said "ah sure we know how easy it is
for ye to take them off". I think those two reasons combined
would make a lot of people not bother restricting their bike,
even if it is a legal requirement... *shrug*. As for the
restrictors themselves, they're intended to limit how much power the engine can produce
so exhaust, throttle, etc, all likely places.

Neil3030

Yeh what he said.

Kegser

The only real reason for fitting a restricter is to make your bike "legal".

There are several different ways to restrict bikes, but restricting the engine capacity isn't one of them. The cc rating of a bike refers to the displacement of the engine, which cannot be easily altered.

Restricter types and installations vary... anything from restricting your speed and rpm to limiting your cylinders fuel and air intake... it depends on your engine and your bike.

It is not however something you need to do to a 125

rymus

yeah just like my 40hp bike that should have been restricted to 33hp when I bought it... good job it wasnt tho....

mwahahah


regarding getting more power out of your bike.. if u fit different exhausts normally it gives u a slight hp increase but nothing magical. you'd normally have to re-jet anyway and if u fit exhausts that let the engine breathe too easily u'll just screw the engine in the long run... so just get a bigger bike...

Pimp Ninja

Giz a bell I need ya

I want yoour bodeh...

etc...

Soz for the off topic stuff.