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Bozzie wrote:when you think you can handle more power, take the restrictors out.

Unfortunately thats how some people end up dying on a bike thats too fast for them.

yea true but i am quite used to quick bikes as i used to race motocross but i supose it would be quite different with a road bike

martrs wrote:yea true but i am quite used to quick bikes as i used to race motocross but i supose it would be quite different with a road bike

Thats as maybe, and I dont want to sound patronising... But... you are only 17 and you have next to no experience of traffic on the road.

Anyone can ride fast in a straight line, but anticipating what the idiots on the road do is a whole different kettle of fish. My advice is, get the ZXR, keep the restrictors in for the whole 2 years before taking them out. Get some experience not only of riding a big bike, but also of riding on the roads.

yea i see where your comeing from il have to see how it goes i geuss.

i know i do want a 400 and will get it restricted but i will have to see if i want to take them out or not after i get some experience on it

In my opinion the best thing is to take your time and not to rush to take restrictors out...I had been driving 5 years before passing my bike test, I then used a 125 sport bike for a year to get used to two wheels, then moved upto a zxr400 restricted, after 7 month i had washers took out, and now im enjoying the bike to the full...but i gave myself time to gain experience and confidence. Its upto to the individual, but gaining experience will make you a better rider.

Xphyral wrote:As for restricting it, the 400 engines are never the same after they've been 33bhp restricted.

kion wrote: If your worried about getin pulled buy the restrictor but dont bother fitting it, restrictors arent good for the engines.

Gemini wrote: my advice dont restrict, choking up an engine full time cannot be good for it!

yet again this gets trundled out...

and yet again I don't suppose anyone is prepared to give a proper reason why restricting an engine would cause any harm?

deviant wrote:

Xphyral wrote:As for restricting it, the 400 engines are never the same after they've been 33bhp restricted.

kion wrote: If your worried about getin pulled buy the restrictor but dont bother fitting it, restrictors arent good for the engines.

Gemini wrote: my advice dont restrict, choking up an engine full time cannot be good for it!

yet again this gets trundled out...

and yet again I don't suppose anyone is prepared to give a proper reason why restricting an engine would cause any harm?

second that one Deviant.
If restricting an engine was so bad for it why on earth would the Formula SAE rules, written by the SAE, state you MUST run a 20mm restrictor in the air intake! A rule seconded by the IMEchE for FStudent!

as i said in your other topic

i had a 50cc moped at 16, i think passed my test 3 days after my 17th b'day and rode and zxr400 unrestricted for a year and a haf

End of the day throtal works both ways, if you think you wont beable to control yourself then get a cbr 125 untill you learn to

rene wrote:as i said in your other topic

i had a 50cc moped at 16, i think passed my test 3 days after my 17th b'day and rode and zxr400 unrestricted for a year and a haf

End of the day throtal works both ways, if you think you wont beable to control yourself then get a cbr 125 untill you learn to

That's the thing, it's not just about throttle control. The biggest hazard on the road are the other users. You need to learn to anticipate their erratic behaviour.

At the end of the day, you can take a horse to water but you cant make him drink.

Caz wrote: If restricting an engine was so bad for it why on earth would the Formula SAE rules, written by the SAE, state you MUST run a 20mm restrictor in the air intake! A rule seconded by the IMEchE for FStudent!

well i suspect that is because without the restrictor, they'd probably have the 600 engines up to 130bhp plus. Bolt that into a FS car with debateable crashworthiness and let an over enthusiastic student rag it...hmm

downside is it means everyone runs il4 engines - there's an argument that a twin would be better for the sort of tests they do on FS (largely low speed stuff for which the midrange would help). But the more cylinders, the easier to breathe through the restrictor.

Caz wrote: That's the thing, it's not just about throttle control. The biggest hazard on the road are the other users. You need to learn to anticipate their erratic behaviour.

At the end of the day, you can take a horse to water but you cant make him drink.

and being on a 125 will make that any easyer than on a 400? you've got to bite the built and learn at some point.

end of the day most 125 riders will get a RS/mito what will do a 100mph and with only a harf adays worth of teaching for there CBT. At least if he has a 400 he needs to prove that he is a capable rider to a certain amount

yea it probably would be best to get some experience on a 125 1st. theres no rush for me to get a bigger bike and it will be worth the wait plus if i get a years no claims bonus on a 125 it would help alot with insureing the 400.

by the way thanks for the advise everyone its helped alot

and theres another point with the insurance, my sister has just passed her cbt, shes just 18 and rang to get insured for cbr 125 that I was gonna let her use,......£1400!!!!! for the year!! I cundt believe it, only cost me 250 for my first year, mind you i am a tad older

tell her look at ebikeinsurance and bennets there both pretty good i got my rs 125 insured with ebike for 75 a month which is like 900 a year which will do me

deviant wrote:

Caz wrote: If restricting an engine was so bad for it why on earth would the Formula SAE rules, written by the SAE, state you MUST run a 20mm restrictor in the air intake! A rule seconded by the IMEchE for FStudent!

well i suspect that is because without the restrictor, they'd probably have the 600 engines up to 130bhp plus. Bolt that into a FS car with debateable crashworthiness and let an over enthusiastic student rag it...hmm

very true, but my main point was there are other ways of restricting an engine besides running a restrictor

downside is it means everyone runs il4 engines - there's an argument that a twin would be better for the sort of tests they do on FS (largely low speed stuff for which the midrange would help). But the more cylinders, the easier to breathe through the restrictor.

main reason for running an il4 is due to lack of other suitable lumps. 600cc bike engines are easy to get hold of, light and relatively cheap. As you pointed out, the inline 4 does breathe better than a twin/single with the restrictor inplace.

I would have loved to see Western Washington uni's V8!