ESE's works engine tuner

[wobbly]

Drew is right about having so much anti squat the bike rises and pulls against the tiedowns on the dyno.
All this is good for is stopping dyno wheelspin.
I made that mistake with the Frepin TZ400.
As it was setup it had too much anti squat, via the swingarm angle.
Around the sweeper at PI it would step out the rear when Discombe powered it into a 2 wheel slide.
I dropped the rear 10mm ,as much as I could on the Ohlins mono shock,and it would then almost take full power in a controlled slide
all the way onto the front straight.
Denis is about to shorten the shock so it can be dropped a little more, so then it can be set up each side of pro or anti squat in testing.

[husaberg]

And this is why I am now building a 2 stroke bucket. We are nearly at 300hp pre litre with the heavy piston over square 300. The power to weight just can't be beat. I am converted.

Insert that's a big decision comment here

[richban]

Insert that's a big decision comment here

How are those barrels coming alone Husa? Do they have honda power valves?

[husaberg]

How are those barrels coming alone Husa? Do they have honda power valves?

No slide blade 2 stage, like an Aprilia.
You still have the RGV as well?
That they will fit nicely.

[richban]

You still have the RGV as well?
That they will fit nicely.

No no Honda all the way.

[husaberg]

No no Honda all the way.

Oh just like Dave............

[richban]

Oh just like Dave............

Ah no. A lot different. The bottom end will be from this decade.

[husaberg]

Ah no. A lot different. The bottom end will be from this decade.

it was a Honda joke, are you planning on using a nsr150 bottom end?

[richban]

it was a Honda joke, are you planning on using a nsr150 bottom end?

Yep. Any idea what the weigh? good gearbox apparently.

[husaberg]

Yep. Any idea what the weigh? good gearbox apparently.

About 22 kg from memory. Nice motor Not sure where Bren is at with his. But it will be further along than me.

Nsr125 89-91

Transmission 6 speeds constant mesh
Primary reduction 3.250 (65/20)

Gear ratio:
1st 3.090 (34/11)
2nd 2.000 (30/15)
3rd 1.470 (25/17)
4th 1.210 (23/19)
5th 1.043 (24/23)
6th 0.916 (22/24)

Honda NSR150SP
Primary reduction 2.954 (65/22)
Final reduction 2.857 (40/14)
Gear ratio 1st 2.916 (35/12)
Gear ratio 2nd 1.937 (31/16)
Gear ratio 3rd 1.470 (25/17)
Gear ratio 4th 1.210 (23/19)
Gear ratio 5th 1.043 (24/23)
Gear ratio 6th 0.916 (22/24)

the crank in the Nsr150 is beefier apparently the primary drive is a different ration which I never noticed before.
There is also a CRM125 variant of the same engine which I think has different ratios again. either that or there is some variation in the rations of the NSR125.


NSR250
Also ere is the gearbox ratios and part number for the ratios that fit NSR250 anyway I seen these the other day and saved it.Note most are RS250 part codes.

[TZ350]

TZ, would you settle for a chocolate teapot?

Yep ...... yum.

[TZ350]

Just as well 50hp would be useless on a kart track as well, look at the f4 vs f5 times

30hp is pretty useless on the Mt Wellington Kart Track too, well in my hands anyway. As its mostly cornering, very little opportunity for stretching the legs. But it is a different hp story at the bigger tracks. Hopefully we will have a decent chassis soon using the frame you gave us. The CVT project has not been shelved and is next in line, it will be interesting to see how that goes on a tight track.

[mr bucketracer]

Drew is right about having so much anti squat the bike rises and pulls against the tiedowns on the dyno.
All this is good for is stopping dyno wheelspin.
I made that mistake with the Frepin TZ400.
As it was setup it had too much anti squat, via the swingarm angle.
Around the sweeper at PI it would step out the rear when Discombe powered it into a 2 wheel slide.
I dropped the rear 10mm ,as much as I could on the Ohlins mono shock,and it would then almost take full power in a controlled slide
all the way onto the front straight.
Denis is about to shorten the shock so it can be dropped a little more, so then it can be set up each side of pro or anti squat in testing.

you better tell mr honda he don't know what hes doing

[mr bucketracer]

Some squat is accepted as an absolute must on proper bikes. If it is tuned out with a steep swingarm such as that bike, the drive force is fighting the suspension and you sacrifice traction.

Might be alright with twenty or thirty ponies to ride (but could be better), but pump a hundred and ninty through the tread and things get...interesting on corner exit.

if only you new what you are talking about

[Drew]

you better tell mr honda he don't know what hes doing

Could you offer something to suggest that Honda tune out 'squat' with big swingarm angle?

if only you new what you are talking about

That's quite inflammatory, my experience with this subject is more extensive than most. Care to spell out where I was wrong?

The big angle can be fine, so long as the front sprocket is high and the line between axle, swinging arm pivot, and front sprocket centre are close to in line with the rider on it.

But the geometry of the bike is effected more with big compression, ie when the bike is leaned over and there's large g's acting on the suspension. This could be used to an advantage I suppose. By crikey there'd be a shit ton of testing and data logging to paw through. In real terms I expect GP is the only environment that would or has happened.