So I got her on the Dyno...

[youngsterbiker]

So I "won" a free dyno power run... the bike is 17 years old... and i was hoping for a solid 85 bhp.... how wrong I was.. shes running 80.65 bhp... Not a bad number but would have liked to have seen better..
Now here's the problem, the air/fuel mixture seems to go mad at 5000 revs. The guy running the dyno has suggested a new air filter as a quick cheap fix. Poor guy had long queue so I did not ask more questions.
Can anybody think of anything that could help solve the problem?
Bike is a 2000 fzs 600, only change is aftermarket exhaust.
Cheers.

[unfazed]

K&N filter will sort it out 

[darrsi]

Had mine dyno'd a few times, although never with the current K&N air filter fitted.
There was always a discrepancy at mid range, but was always told aftermarket exhausts would never match the OEM one on a Fazer, and this fella really knows his stuff.
Rejetting never helped either, tried that and it never ran right at all.
It's a 17yr old bike, don't expect miracles, just enjoy what you've got.

[darrsi]

Moderators, you gotta sort out that miniscule texting thing, it happens a lot.
Don't even know why that happened?

[Bretty]

I thought the fazer was supposed to be 95bhp from new and assumed with a sports exhaust and k&n filter it would be touching 100.

Where do all the horses go?

[unfazed]

Fazer is rated at 95 Metric Hospower which is about 70Kw and 94 BHP

Dyno is at the rear wheel unless its converted to Crank. 10 to 15% would be the approximate losses between rank to rear wheel.
this would put 80 bhp at the lower end of the %  rule

[Bretty]

So 95bhp (at the crank/flywheel)
and 80hp (at the wheel)

[darrsi]

This was 4 years ago, when i used to be able to run the 100m in 9.5secs.
Now i can run 9.5metres in 100secs. 


http://foc-u.co.uk/index.php/topic,6358.msg64999.html#msg64999

[darrsi]

As i said above


......................................................................

[slappy]

Different dyno, different conditions, even a different dyno operator can all have an effect on the bhp figure.

[kebab19]

Dynos obviously vary considerably, but I read somewhere a long time ago that the FZS600 puts out between 79 and 83 @ the back wheel. If this is true, it sounds like your peak power is well within the normal range. The Thundercat only generates about 5 ponies more (until the ram-air effect kicks in) so unless you only want top-end power as the later R6s did, 80 ponies with an impressive midrange is very good for a 19 year old middleweight all rounder.   

[darrsi]

Dynos obviously vary considerably, but I read somewhere a long time ago that the FZS600 puts out between 79 and 83 @ the back wheel. If this is true, it sounds like your peak power is well within the normal range. The Thundercat only generates about 5 ponies more (until the ram-air effect kicks in) so unless you only want top-end power as the later R6s did, 80 ponies with an impressive midrange is very good for a 19 year old middleweight all rounder.

Exactly, it is what it is, if you need or want more then get a bigger bike.

[matt7chunk]

hey youngster i was there lol colchester kawasaki i watched the run , i was there with my fazer

[Bretty]

Those curves are very interesting!

If you ignore the max torque and power figures and look at the extra torque/power you're getting at the lower revs (below 5,000rpm). It looks about 20% more!  I'm not sure how much time i spend with my bike between 3,000 and 5,000rpm, but I should think that extra power would be quite noticeable around town and off the line.

[BBROWN1664]

Moderators, you gotta sort out that miniscule texting thing, it happens a lot.
Don't even know why that happened?

is it better now?

it only happens with a couple of users. Must be their browsers

[darrsi]

Moderators, you gotta sort out that miniscule texting thing, it happens a lot.
Don't even know why that happened?

is it better now?

it only happens with a couple of users. Must be their browsers

Yes, thank you 

[youngsterbiker]

Just as an update... i am in no way complaining about 80 bhp. its plenty enough to kill me. i need no more. its more the dip at 5k revs that is bugging me.
it accelerates fast then drops for a second till it picks up again.. thats what i want to fix

[daviee]

might need the carbs cleaned

[darrsi]

It's the exhaust that's causing it.