TOPIC:

So I got a chance to make some dyno run's this past weekend
Best rear wheel was 77.77 HP and 100.21 ft. lbs.

Rpm's in this pic. read 1/2 the true rpm's for some reason but
the bobble at the end is the rev. limter gettin mad.

I think the 117.5 main's I put in killed the power around 8000
so back to the 120's or maybe the 122.5's I have.

Id say thats pretty impressive power for a stock motor with a set of carbs

Have you worked out the traction issues yet?

Is that dyno chart supposed to be from a KZ750 with an 810 kit with stock cams?

I don't want to rain on your picnic but that's just freaking over the top

If it is, that's one more example of a f'kd up dyno jet reading. There's not a snowball's chance in hell that thing is laying down 100 ft.lbs of torque at the rear wheel.

The photo isn't very clear when I downloaded it to see the chart better. Anyway, do the math and the torque value is way out in left field.

Example:

Say that 77HP is at 8500 RPM. The toque value would be about 47 ft.lbs.

Say the peak torque happened at 7000 RPM. That's 134HP

Larry I'm not sure he had it set up right as the rpm scale
at the bottem only go's to 5500 rpm's.

as for the motor it's a bone stock never opened 8500 mile 83 gpz750.
Will be rejettin and going back for some run's so maybe then I can get a better reading.

More rain...
My full silly race bike from that era (also based on a kz750 , kinda :0 ) was straining to make 122hp and 63 ft/lbs .
and yes Larry , that was right before it blew up (that week) .
Don't get me wrong I loved that engine but at anything approaching 110 hp , 10000 rpm or just one blown down shift it was back to square one .
I even had one unload just chopping the throttle from 4k rpm no load .

~kop

I have no doubt the dyno operator hands out charts they feel are accurate.... But I'll stand right up and call bullshit when I see it

Larry I didn't post this to bragg about my junk
making these number's I know better.
I posted because I got a chance
to put my junk on a dyno and the number's seemed fucked up to me.

Like I said before the 77hp seem's reasonable but the 100ft. lbs.
is a bull shit number and I know that.
The read out is just wrong
I think your 47 maybe low 50's would
be more in the ball park.

You should get air/fuel readings with any dyno session.

Corey it wasn't a dyno session just a $25 trailer ride
at a bike rally

So went back to the track after playin with the
carb.'s some more and going up 3 teeth on the rear sprocket.

101 degree day with track temp I'd say around 140 or so
and greasy as 1/2 cooked bacon went a best pass of
12.26 at 103 with a 1.80 60 ft. blowin the tire off.

I measured the tire between the rubber bead's
and Im only gettin 3" of rubber on the ground at 20 psi.
so in go's the gpz swingarm so I can fit about a 170 tire.


Monthly bonus check come's Friday so callin Buchanan's and
ordering a 17x4 Alum. rim and spoke kit then figger out what tire to run.

Was looking at tire's and M/C super store list's
a 180/55/18 Shinko 003 stealth soft compound.

Would there be any benafit staying with an 18" rim
or stepping down to a 17" like I plan.
The 17" is for a better choice of tire's.