ZXR250 BHP.

[John]

what sort of dynos do these hit - getting a 92 zxr and told it dyno'd in at 32bhp (with aftermarket can) - sounds about right to me or should I check the compression?

thanks :banana:

[vifferman]

17.375, or thereabouts.

At a wild guess.:done:

[FlyingDutchMan]

If its a 4 cylinder one (I don't know my ZXRs and ZZRs very well), it should hit 45HP. If it was built in 94 onwards, 40HP. The reason: That was what the Japanise law was at the time. 45HP limits for 250s which was changed to 40 in 93/94.

All the big four (Honda, Suzuki, Kawasaki, Yamaha) 4 cylinder 250s sports bikes produced 45hp in the early 90s.

It may have been restricted to 33hp to comply with some law somewhere else in the world, or the guy gave you the kw rating (33kw=45HP).

[John]

17.375, or thereabouts.

At a wild guess.:done:
now thats just biteing the devils tounge :P

[jrandom]

32 seems a bit low, but then again, each dyno seems to live in its own unique little world of numbers. How do *other* ZXR250s do on that dyno? What do brand new stockers of various brands for which rear wheel BHP figures are well known measure at?

Does the bike happily pull to 180 or so in top gear? It should. Does it *feel* like it's making good power?

Certainly get the compression checked, though. Definitely. Never buy a bike without checking compression, brakes, electrics, state of the tyres, feel of the clutch, straightness of the discs, dirtiness of the plugs... the list goes on.

[John]

I'm pretty sure 40hp/45hp is the engine power at the crank?...

anyway I will go check it out - just wondered if anyone had some ideas on the sort of HP it should be pushing at the rear it was at the red barons dyno so yea dont know how good or acurate that is, thanks for the help all :yeah:

[vifferman]

Certainly get the compression checked, though. Definitely.
:doh: Fergot.

Never buy a bike without checking compression, brakes,
:doh:

electrics,
Yeah, it had some

state of the tyres,
Yeah, it had some of those too..

feel of the clutch,
Yeah, I clutched it a time or three...

straightness of the discs,
Yeah they were straight, but one's mental, or at least definitely inferior

dirtiness of the plugs... the list goes on.

:confused: I checked the colour.
And the pricetag.
And rode it a km or five.
:confused:

[John]

:confused: I checked the colour.


quick head for an eye test, I have serious doubts about your color vision (PT)

[vifferman]

I'm pretty sure 40hp/45hp is the engine power at the crank?...
Yeah, usually the (exaggerated) crank HP is quoted by the manufacturers, whereas the dyno operators quote "at the wheel" HP.

anyway I will go check it out - just wondered if anyone had some ideas on the sort of HP it should be pussing at the rear it was at the red barons dyno so yea dont know how good or acurate that is, thanks for the help all :yeah:
Didn't you mean "pussying"? :spudwhat:
I read somehweres that the "at the rear wheel" figure is about 15% down on the crank HP, which would make it about 34-39. However, the actual figure depends on:

Dyno set up (calibration) and operation
Air temp and pressure
Frictional losses due to engine/drivetrain wear and tear, dirty/worn chain, etc.
Rear tyre pressure.
Why/who the dyno test is being done for.

[John]

yea I havnt actually seen the bike in person or anything and was just told about it it had new sprokets etc after 18,000k so I guess it was raped furiously..

Just was going to use the dyno reading as a point of figuring the engines health, so thanks for that there Mr VFR

[FlyingDutchMan]

I'm pretty sure 40hp/45hp is the engine power at the crank?...

anyway I will go check it out - just wondered if anyone had some ideas on the sort of HP it should be pushing at the rear it was at the red barons dyno so yea dont know how good or acurate that is, thanks for the help all :yeah:

I just checked a ZXR250 manual - it should be 45HP. Even if it is at the crank, losing 13HP on the way to the wheel is shocking.

[jrandom]

Red Baron's dyno? I've seen ZXR250s that have done 41 on it, so your prospective bike is definitely down on power enough that you should be worried.

Don't touch it with a ten-foot barge pole. It's not worth the hassle. Find a mechanically sound one.

[John]

I just checked a ZXR250 manual - it should be 45HP. Even if it is at the crank, losing 13HP on the way to the wheel is shocking.
Yea I agree its a pretty rank loss of HP but I think that mainly relates to all the pooie cam chains and shafts (lol) that suck up the kinetic energy from the initial crank, and also I think they try to trick us into thinking that its around 45hp .. I think but I know absolute crap all so you maybe right my words as good as cottage chesse (read: bad very bad lol)..

thanks..

[John]

Red Baron's dyno? I've seen ZXR250s that have done 41 on it, so your prospective bike is definitely down on power enough that you should be worried.

Don't touch it with a ten-foot barge pole. It's not worth the hassle. Find a mechanically sound one.

I dont know that seems high I got more details about it 32.8 PS at 19.2deg amb it seems about right??..

[bear]

I've found this site to be useful: http://www.motorbikes.be/en/search.aspx
It's got the ZXR down as 45bhp/33.6kw.

[jrandom]

I dont know that seems high I got more details about it 32.8 PS at 19.2deg amb it seems about right??..

Well, if Red Baron are selling it, and you're quite keen on that particular one, book a full mechanical check at Mt Eden MC, get the bike over there, and get a report. Can't go wrong.

[ktulu]

or you could buy an RGV http://www.trademe.co.nz/structure/auction_detail.asp?id=22405513

[TwoSeven]

just to be perdantic power figures are always given in kW, ps, or Bhp for motorcycles - never use HP.

The reason is that there are two HPs, english and metric - one is 0.9863 of the other. The other reason is tha HP is only measured at the crank, so unless someone has had the engine out of the bike, it should be done in Bhp which is measured at the rear wheel.

[John]

Yea I will take it in for a check at Mt Eden when I go to have a better look, I was just wondering if it was about normal for a ZXR dallas (nice guy) was explaining how the CBR's dyno in at 35ps in comparison but the ZXR's torque and powerband is more explosive which lets it keep up..

klutu I would have got the RGV but A. Didnt have enough of the munies, and B. I'm scared of your one :P

[ktulu]

hahaha, yeah fair enough john, god, I am sick of the thing, got a cable replaced but it was second hand and pretty buggered but it ran like an absolute machine when I got it back but the cable fucked and now its on 1 again. Reserve is getting lower and lower. How much are you looking to buy a zxr for?

[Jonty]

Well, if Red Baron are selling it, and you're quite keen on that particular one, book a full mechanical check at Mt Eden MC, get the bike over there, and get a report. Can't go wrong.

Or you can wait 6 months and buy mine for a steal :banana:

[John]

haha yea dont make the mistake of a two smoke to scary and to fussy over 3 years it will be about 8k with full cover insurance over that time, but the deposit is satisfying and its in great nick 18000k etc etc...

Tested at the crank for 46HP ahh the wonders of an aftermarket can :P...


Jonty I would wait but I am definatly not going to walk to tek for 6 months thanks anywho :P

[Jonty]

Jonty I would wait but I am definatly not going to walk to tek for 6 months thanks anywho :P

Fair enough too, good luck with the new acquisition :2thumbsup

[The_Ego]

How much do Mt Eden MC charge for a full mech check and a valuation? May buy a bike private but want to have it checked and the finance co also wants a valuation.

[jrandom]

How much do Mt Eden MC charge for a full mech check and a valuation?

Jeez, boy, how are we supposed to know that? Telecom forget to deliver the White Pages out your way last year or summat? :eyepoke:

09 303 1960. Call them and ask.

[Jonty]

Jeez, boy, how are we supposed to know that? Telecom forget to deliver the White Pages out your way last year or summat? :eyepoke:

09 303 1960. Call them and ask.

Bad day jrandom? :msn-wink:

[Coyote]

They CBR250RR should pull the same amount of hp as the ZXR right? I'll have to dyno mine sometime...


...and fit it with NOS :yeah:

[カワサキキド]

I was told by the guy who has a dyno here in Christchurch that ZXR250s usally put out 33hp at the wheel. How many k's has it done? When I was looking for mine I test rode one that felt like it had half the power of mine, especially down low.

[John]

I was told by the guy who has a dyno here in Christchurch that ZXR250s usally put out 33hp at the wheel. How many k's has it done? When I was looking for mine I test rode one that felt like it had half the power of mine, especially down low.
Hi,
Its a fresh jap import - 16,826k, so it is in the correct area of BHP then (32.8ps) so it must be ok, I have a feeling it wasnt re-jetted when they fitted the pipe so I will re-jet it and see if that helps the situation.
and also as said previous all Dynos are abit different, maybe your mates one has less resistance to movement, or reads slightly high or maybe the barons reads abit low.. who knows, I will find out when my mate goes and has a look today for me, thanks for your imput though

[カワサキキド]

Just out of interest, what's it worth for a run on the dyno?

[John]

Just out of interest, what's it worth for a run on the dyno?

Hmm I would gladly tell you if I knew, but I'm buying the bike from them and they offer a dyno on all there bikes so you can see what it can do, I suspect it would be around the 50$ mark though.

Seems to be a pretty snazzy dyno though, gives you a good dose of info. :apint:

[SPman]

Red Barons dyno is reasonably conservative across the board. Most 250s Ive seen figures for, there , run 31-35 ps. Seen a ZZR1100 run 134ps...and a FZR1000 run 138!

[Teflon]

Red Barons dyno is reasonably conservative across the board. Most 250s Ive seen figures for, there , run 31-35 ps. Seen a ZZR1100 run 134ps...and a FZR1000 run 138!

My FZR had about 130hp at the wheel, just lacked the torque.

[カワサキキド]

What does 'PS' stand for?

[カワサキキド]

PS stands for "Pferdestaerke", which is just German for "horsepower".

[John]

PS stands for "Pferdestaerke", which is just German for "horsepower".
To explain further, its sort of a unused way of measuring power - it uses different maths to get the figure compared to the traditional HP figuring.

1 PS = 75 kp·m/s = 735.49875 W

(Pferdestärke = horse strength)