#6

[speedpro]

So who is/was it?

Nigel Duff

[Buckets4Me]

Was going to say Nigel
the salute looked like him lol
I heard about this photo some time ago lol
I got a nice little video of him trying to keep up with some rs125 around Mt Wellington

he would have done it to if he hadent have binned the bike lol

[F5 Dave]

simpe 100 chamber as requested

Hmm, the measurements seem to be in some sort of code

[Skunk]

Hmm, the measurements seem to be in some sort of code

You're not that young!

[speedpro]

and I'm not expecting much less power than before

Yeah well . . . . . Put it on John Connor's dyno today and I'm not sure I'll ever get over the disappointment - 16hp. Funny thing is it had a near identical "shape" power curve to another MB100 making 23hp. Lets hope the Wobbly pipe sorts that out. The port timing must be more or less standard now but not sure about time-area.

[Buckets4Me]

it could have been making MORE than 16hp or it could be less

you should know

not all dynos read the same
but you can only compair figers from the same dyno
Johns dyno may read under or most likely the other dyno
reads over
from memory Johns bikes where making 18 hp out of the 4 stroke cb125 engine
so you would be 11% down on hp ????

let us know when you put the new pipe on and re do it on his dyno
I think dad is heading out there some time soon with a few bikes
so would be good to compair
you'r bike had more pull than his last time before the delta box and crash

see how it goes this sunday

[F5 Dave]

yeah that sucks, sometimes engines just dissappoint you. the RGV125 I made was a bit like that, Revved for africa (too much) but power was super flat, thought it was the reeds, but no. I had the RS125 pipe & porting pretty similar to old RS/CR so shouldn't have been a mile away (18 or 19 hp (or 24 on another dyno)).

So I could have made a new pipe but I couldn't see it picking up that much to scare Nige etc. Then it decided to destroy itself twice so mute point.

Hard to tell though, a total pipe/porting mismatch can suppress power. On my 50 when I went a whole new direction the pipe I used was a bit different but gave no more power for more revs on my old engine, but with the engine it was designed with gave 2 more. Hard to see you finding another 9 with a pipe though. We'll see if he feels guilty for taking your money soon I guess.

[dangerous]

yeah that sucks, sometimes engines just dissappoint you.

yeah LOL, like my 500 turbo did when I put it up on the dyno... I had slightly modified it and it came up less than the book said, but what didnt help is they didnt have a progame for it and it kept lighting up on the real, so they tied it down so bloody hard it strugled to rotate wth no boost

[F5 Dave]

yeah but claimed horsepower is measured at the sales brochure so you will never reach it at the rear wheel. They just plain lie about how much hp they make (of course 0.5hp more than brand x) & then claim it's measured at the crank, -gee how useful.. Must have been a groady old small roller dyno to need to tie down that much.

[speedpro]

I thought the bike was going a "little" better than the 16hp should have allowed and it was. John forgot, or was that me, about the correction factor which put the hp at about 18. I've seen hp increases of the amount required just from fitting a good pipe so must sort the new one out.
I have been gradually reducing the tyre pressures I run and currently have 19 and 20psi cold F & R respectively. I've been riding hard enough to be off the edge of the front slick on one side and close on the other. It was a warmish weekend but even so the tyres still aren't showing much in the way of heat. The front is a soft YDC Bridgestone Battleax 90/580R17and the rear is a Metzeler Racetek K1 120/70R17 off the front of a 600 and the wheels are more or less optimum size at 2.75" and 3.5". Does anyone run these tyres on comparable rims. I'd be interested in feedback. This is the first bike I've had that has decent suspension and handling and I wonder how much that is helping.
Checking things over after my little lie down and it does look like the front let go. There is some nice little diagonal scuffs al the way round and all the way to the edge. I definitely have at least one broken rib and probably two going by various pains. Good thing is that it only hurts when I breathe and the new job starts on 4 Nov so plenty of time to get (more or less) sorted.

[F5 Dave]

By a couple of weeks you should be sleeping ok as long as you don't do anything stupid in the mean time, like stand up too quickly or help shift someone. New job staying in NZ?

[Buckets4Me]

ouch

I think everyone hase had the frount go on them in that corner but I havent heard of anyone braking a rib thats a first

did you hit the handlebars or forks or something ???

you where flying did you get anyone timing you
and the way the back wheel was trying to overtake you in the hairpin was also impresive

get better and stop falling off

[speedpro]

Fell on my arm, just like last time I broke ribs though that was the other side. New #6 doesn't like that infield right hander. The first time I raced it I ended up in hospital after high siding on the exit and this was the second time I raced it. Might try slowing down a bit round there. Third time is supposed to be a charm , , , , eh?

[speedpro]

I was in the garage taking photos so snapped one of the new chamber. It is a bit rough but maybe not quite as rough as it looks in the photo. Another couple of hours should see it on.

[Skunk]

I was in the garage taking photos so snapped one of the new chamber. It is a bit rough but maybe not quite as rough as it looks in the photo. Another couple of hours should see it on.

That's a short mid section and long baffle - to me anyway. Can you explain the effects of that?