Topic: My CB550 K0 on a dyno (just for fun).

[Dimitri13]

There was a dyno shootout at a local bike shop. $15 for a few pulls, no tuning. I was just curious as to how much HP I've lost over the years (the result will surprise you!), and how my a/f ratio was doing.

My points are shot, so lower RPMs sound like snot, then it smooths out for a nice sexy pull.

[Motovid] CB550 Dyno Pulls

Results below, you should totally watch the video first!

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(Link if the picture is difficult to read: http://i.imgur.com/h9LFP.jpg)

[brewsky]

Thanks for posting!

I'm guessing that's several more hp than stock, and the a/f looks good.

Any engine mods besides intake & exhaust?

I try to take advantage of the local shop's yearly shootout for tuning check also.

2 pulls and a t-shirt for $20 not too bad!

[Dimitri13]

Stock was factory-claimed 50bhp. My numbers are surprising because I thought I would've lost much more than I did.

Internals are all stock (except for the large amount of carbon build-up I'm sure has accumulated). I've got velocity stacks and Two-Brothers exhaust (complete with an exhaust leak at the midpipe because I was too lazy to do any welding). I rejetted, and it seems to be very nice at the mid and upper range, but the ratio is all over the place down low (most likely because my points are shot).

[singedebile]

yeah 50hp for the motor, but at the rear wheel I believe I read somewhere that its between 39-41 stock

[cb550choppa]

my bike made 44 rw when it had 15k miles it had open carbs and straight pipes

[cb650]

Sounds very nice upper end!!!!!!

[Dimitri13]

singe: wow, really? That's pretty awesome

choppa: how much with the nitrous? Ever get it running right with it?

650: thanks! Like everything though, sounds so much better in person.

[cb650]

That is just ear porn in my book.

[Dimitri13]

You should've heard some of the other bikes there. There was a fuel injected sportster there, ran pretty rough at the bottom end, but mid and upper end, it was like getting punched in the chest. There was also a turbo Hayabusa that was just ear-splitting.

[cb550choppa]

singe: wow, really? That's pretty awesome

choppa: how much with the nitrous? Ever get it running right with it?

650: thanks! Like everything though, sounds so much better in person.

i have not gotten it running good enough yet working on the carbs now that was like 5 years ago when it was on a dyno it has over 30k now