Had my bike dyno'd the other week.

Originally Posted by Blue_SV650S

You mean the red-line on the bike is at 13k?

I'd certainly want to know if it was RWHP or not ...

Aye... All dyno's can only give RWHP if they quote anything else they are guessing. The only way to check crank power it to take the engine out of the bike and find somewhere with the equipment to run off of the crank.

Originally Posted by G

Does it only rev to 12500ish

Are people basically saying the dyno company has printed off a graph he thinks you will be happy with without noticing that the Revs are all wrong.

I would defo go back unhappy.

Indeed it does sound dodgy. I take it you wernt there when they ran it.

Originally Posted by muffles

Now I can see the figures...almost 116hp is quite a lot at the rear wheel, is it not

And it would be a little low at the crank...

Yes a bit high it would seem. These I think usually about 108-110 RWHP in reviews.

[yorkie_chris]

Anything quoting crank HP is b0llocks. One car tuning firm I dealt with basically "corrected" .3 arbitrarily, to make chavs happy. Needless to say I never went back.

"Redline" and where the limiter kicks in can also be different. Also tachos aren't necassarily accurate either.

Originally Posted by yorkie_chris

"Redline" and where the limiter kicks in can also be different. Also tachos aren't necassarily accurate either.

SV1000 is a prime example. Limiter is at 10K rpm yet the tacho goes to 11K... Most 600's are especially bad for it these days

[yorkie_chris]

Well aye but it'd look silly with the scale going to 10,200rpm (for 650...)

Some 600's the needle is pointing a few '000 too high at high revs.

[northwind]

Most dynos can do the "correction" for crank hp, if the operator decides that the owner of the bike would prefer a bigger number. Dishonest dyno numbers are pretty much a matter of fact sadly, if you want an optimistic number then either a) go to the dealer where you bought your bike, b) get it done somewhere that's just charged you money for tuning, or c) get it done somewhere that wants to charge you money for tuning. If you want an honest one, go to a race builder, or someone who couldn't give a rat's ass whether you're happy with the results or not (I use YPE, they come under the "rat's ass" category) But crank figures in general are for marketeers and idiots.

The rev-limiter kicks in at 13350rpm - not the 'redline'. Only way it could rev higher is with the race kit ECU and wiring loom, which if the previous owner had fitted, you wouldn't have any working lights!

The results are a little bit high - most people get between 105bhp and 109bhp with an end can from a stock 675 (RWHP)

[mr.anderson]

Originally Posted by ThEGr33k

Mine is a 2007 ZX-6R that went on the same Dyno and Mr Monkey's. Apparently get 122.8 at the rear wheel at 14,200 rpm.

All I have done is put a Yoshi RS-5 SS can on it.

Will scan that thingy tomorrow and put it up.

Originally Posted by teriyakimonkey

After posting the same pic on the 675 forum it has promptly been blown out of the water. It all makes sense though. The red line for example is nearly 1k revs below that on the graph. Do you rabble think that's a valid reason to ask for my money back?

The 675 race bike that my mate took to a 3rd and 2nd place at MRO Triple Challenge's Silverstone BSB meet makes about the same power at the same revs as yours. None of the ones we've heard of make peak power any higher than yours in standard engine tune, and ours makes it a full 1200 revs off the redline. All the difference is between a stock one and a Triple Challenge bike is a Micron end can and a race filter with some dyno work to get fuelling right to suit.

Originally Posted by mr.anderson

Mine is a 2007 ZX-6R that went on the same Dyno and Mr Monkey's. Apparently get 122.8 at the rear wheel at 14,200 rpm.

All I have done is put a Yoshi RS-5 SS can on it.

Will scan that thingy tomorrow and put it up.

No offence but I think someone is yanking your chain with that.

[ogden]

122? That's 750 power, not 600 power.