"33bhp?" Yes "i dont believe you, I'll seize your bike and take you to court"

[Nobbylad]

I'm hoping for AT LEAST 100 pages...

Just read this whole thread and thought I would register.

Does anybody know what standard FI international manafacture their kits to in order to achieve 25kw (33bhp). What means are they using to test this themselfs, are they going by engine crank or net rear wheel output?

As for damages don't settle for less, if they have damaged your exhaust and seat you want compensation towards the cost of replacement.

The question of wheter or not you will be prosecuted is laughable. The bike has obviously been restricted. The extra few bhp is going to be down to in-accuracey of the dyno machine or how the test was carried out.

Originally Posted by mrcool

Just read this whole thread and thought I would register.

Does anybody know what standard FI international manafacture their kits to in order to achieve 25kw (33bhp). What means are they using to test this themselfs, are they going by engine crank or net rear wheel output?

After all the tripe FI International spouted about certification being a legal requirement for so many years, I'd be surprised if they even have use of a dyno to do any testing on.

£150 for a set of what are effectively 4 washers and a worthless piece of paper, that's extortionate even by Aprilia and Ducati spare parts standards... I don't even think Bimota would come close.

We use FI kits at work, but I refuse to pick the phone up to deal with them for fear of losing my rag with them and saying what I really think.

Originally Posted by Lozzo

After all the tripe FI International spouted about certification being a legal requirement for so many years, I'd be surprised if they even have use of a dyno to do any testing on.

£150 for a set of what are effectively 4 washers and a worthless piece of paper, that's extortionate even by Aprilia and Ducati spare parts standards... I don't even think Bimota would come close.

I have a Kawasaksi Z500 (1979) im putting back on the road. A search online specifies it as 50bhp. I have never dyno'd it so don't know what the actual bhp is. I was thinking of home making a throttle stop and with some dyno time (presuming it is over) turn it down to produce 33bhp. I don't fancy paying £150 + fitting for some carb washers. How well do you think this would work?

Originally Posted by mrcool

I have a Kawasaksi Z500 (1979) im putting back on the road. A search online specifies it as 50bhp. I have never dyno'd it so don't know what the actual bhp is. I was thinking of home making a throttle stop and with some dyno time (presuming it is over) turn it down to produce 33bhp. I don't fancy paying £150 + fitting for some carb washers. How well do you think this would work?

It will work as well as an FI International kit, as long as you have an idea of where to start with mounting it safely on the throttle mechanism and methods of machining the stop to such a standard that it stays in place etc. Personally, I'd develop an adjustable one using something like a throttle idle adjuster screw to go on the upper reaches of the throttle travel so you can tweek it down to 33 bhp on the dyno without having to strip the bike down, rather than mucking about taking the fuel tank off off, adjusting it then refitting the tank every time.

You won't need any certificate to carry, but at a push you could produce the dyno printout to show the coppers - that's got to be worth 100 times more than any certificate to anyone.

With a 1979 Z500, I think it might just about scrape 33 bhp as standard anyway, if you're lucky. They weren't quick when they were new, and they certainly haven't got any better over the last 31 years. You may be wasting time even trying to make a throttle stop, so just stick it on a dyno and see what the bhp is as it stands now.

Bikes of that power (33bhp) all do a pretty consistent speed so you could use that as a guide. The ninja 250 is 30bhp and does just a over a ton, so do restricted sv's don't they? If your bike just about does a ton, it must be pretty near 33 maybe.

top speed doesnt come into play, not really, just think a 250 lightweight bike with 33bhp is going to go faster than a heavy weight restricted bike,

Originally Posted by james160987

top speed doesnt come into play, not really, just think a 250 lightweight bike with 33bhp is going to go faster than a heavy weight restricted bike,

thats a rule on the 33bhp restriction too, a power to weight ratio not exceeding 0.16kW / kg.

[Stu]

Originally Posted by jaymee

thats a rule on the 33bhp restriction too, a power to weight ratio not exceeding 0.16kW / kg.

equates to 156kg minimum weight if it makes 33bhp