ESE's works engine tuner

[F5 Dave]

As I'vesaid several times before, the MB pistons are swhite for several reasons . I think you need more beers imibibed, perhaps my garage is not the ideal sermon tea

What the heck is predictive text doing?

The KT piston is shorter and has a 1mm ring. This helps create big power. The sucky thing is the mondo over square engine it creates.

The YZ100 piston is much better than mb but not really available in 2017 and needs a Yamaha 16mm small end rod somehow adapted.

[F5 Dave]

And its been several months since one of my musical interludes, which Ihighly rrecommend

https://m.youtube.com/watch?v=7YDPNl7PeUU

Holding on to everything
That's not what it seems.

The apostrophe confuses me, but so be it.

[tjbw]

....

I have always wanted to try a disc valve with a offset disc by about 20mm so it could be uterly huge. Thus fully open for a longer time period for a given timing duration.

...

My head hurts

[bjorn.clauw.1]

But unfortunately they decided not to continue their racing program, after a very bad experience with a very 'famous' designer who made a totally useless engine, based on a kart engine fitted 'upside down' in a motorcycle......
It had no power and kept seizing, a real disaster.....

http://www.karting1.co.uk/death-of-t...jected-future/

Hi Jan, was following the athena story about direct injection with great interest. Until I remembered from where I knew the name of their famous designer. Still, it put a smile on my face reading it, so I guess it was not a complete waste of time.

[polinizei]

Neels describes in "Using Post2T to investigate Detonation" TUBmax should be lower 950° for AV Gas.
Is there any temperatur recommendation for unleaded 95/100 Fuel?


[ATTACH=CONFIG]328646

[bjorn.clauw.1]

I searched everywhere and it seems Rekluse does not make a clutch for the Banshee/YPVS.
But knowing Yamaha seems to use common shafts /splines etc for model after model, I would think maybe a YZF250 or 450 MX might be able to fitted
with some work ?

this looks like a nice clutch basket:
http://www.fastfromthepast.com/95-h120

dry clutch would be nice too.

[husaberg]

My head hurts

Time area is increased with a larger valve timed to the same duration.
It would have to be driven by a cross shaft doubling as a balance shaft to avoid an overly long intake track.

[TZ350]

Hey all, I'm trying to find the sensible limit that I should work to for a standard MB100. I know I'd be much better off de-stroking and going to a kart piston.

You are in luck. No need to de stroke.

The 110 thing was brought in specifically so MB100's and other 100cc engines could use the KT100 pistons without going to the trouble of de stroking their cranks.

But if you do go to the bother of de stroking the crank to 48mm then you could use an old salvaged (re plated) 54mm water cooled NSR cylinder or de stroke to 45.5 and use a salvaged RGV 56mm cylinder.

I have to admit that I objected to the 110 thing but now that its here it opens the doors to traditional Bucket engineering by making good use of a lot of worn out old cheap stuff that is floating around.

The 110 thing really opens the door to improved reliability for 2T Buckets that are built in the traditional way.

[Peter1962]

34mm Wow thats a huge carb area eq to about a 48mm carb
36 that like a single 51mm carb.
The Dea ones i have the molds for have been improved in the design of the septums, you could actually shave with them. i feel they would work rather well though if i could get the transfers to go supersonic.
I have always wanted to try a disc valve with a offset disc by about 20mm so it could be uterly huge. Thus fully open for a longer time period for a given timing duration.
Never finished.... is actually my middle name

Husa, I must admit that I do not understand what you mean by this. (sorry...)
Could you please explain what you are aiming for ?

[wobbly]

The Hinson spring clutch for the Banshee is way heavy and way expensive.
I have changed the csk cap screws on the cush drive plate from 6mm to 8mm and used 12.9 grade plus i have ordered some
Lurethane rod that is used in race car suspension bushing to make the cush drive buttons,its way denser and much stronger than the soft " rubber " originals.
Hinson say the 8 plate billet clutch is good for 100 Hp,but i think constant speed shifting creates big shock loads that simply smash the stock cush drive.
I hope what i have done for now will work.
Rekluse do clutches for later model big Yamaha MX bikes, so i am researching if Yamaha has done as they always do, use very similar shafts and splines from model to model.

[wobbly]

Avgas,or any leaded hi octane race gas runs best with hi com and lean mixtures.
Pump gas or no lead gas makes better power when running richer, with less com and generally more advance.
But in some applications ( like KZ2 ) we need to run lean with pump gas to get pipe temp,its a trade off between outright peak Hp and rev ability.
So pump gas " can " use the same TuBmax numbers as Avgas in EngMod, it depends upon the end use and mechanical setup of the engine.

[Grumph]

The Hinson spring clutch for the Banshee is way heavy and way expensive.
I have changed the csk cap screws on the cush drive plate from 6mm to 8mm and used 12.9 grade plus i have ordered some
Lurethane rod that is used in race car suspension bushing to make the cush drive buttons,its way denser and much stronger than the soft " rubber " originals.
Hinson say the 8 plate billet clutch is good for 100 Hp,but i think constant speed shifting creates big shock loads that simply smash the stock cush drive.
I hope what i have done for now will work.
Rekluse do clutches for later model big Yamaha MX bikes, so i am researching if Yamaha has done as they always do, use very similar shafts and splines from model to model.

For years Kawasaki used rubber inserts in the clutch cush drives. The 550 to Z750 all used the same setup - which collapses when you get more HP.
I've made up urethane bushes with good results. If you find the stuff you've ordered is too harsh, just make them give a little more with a hole in the center...

[richban]

plus i have ordered some
Lurethane rod that is used in race car suspension bushing to make the cush drive buttons,its way denser and much stronger than the soft " rubber " originals.
Hinson say the 8 plate billet clutch is good for 100 Hp,but i think constant speed shifting creates big shock loads that simply smash the stock cush drive.
I hope what i have done for now will work.

Not sure that machined Urethane would last better. Unless you cast them maybe. The rear wheel cush drive ones we ran on the buckets split quite quick. faster than stock rubber.

[husaberg]

Husa, I must admit that I do not understand what you mean by this. (sorry...)
Could you please explain what you are aiming for ?

Unlikely i could explain but a picture might help?
Okay its clearly not to scale and a pretty lazy ass attempt at a picture.

It would clearly only work with an engine that had no ancillaries on the disc side of the crankshaft.
Thus the clutch and the ignition would have to be on the other side.
Throw in Flettners variable inlet port timing as well.

[husaberg]

The Hinson spring clutch for the Banshee is way heavy and way expensive.
I have changed the csk cap screws on the cush drive plate from 6mm to 8mm and used 12.9 grade plus i have ordered some
Lurethane rod that is used in race car suspension bushing to make the cush drive buttons,its way denser and much stronger than the soft " rubber " originals.
Hinson say the 8 plate billet clutch is good for 100 Hp,but i think constant speed shifting creates big shock loads that simply smash the stock cush drive.
I hope what i have done for now will work.
Rekluse do clutches for later model big Yamaha MX bikes, so i am researching if Yamaha has done as they always do, use very similar shafts and splines from model to model.

Ages ago on the foundry thread i posted a engineering drawing of a YZF450 and YZ250 gearbox i will see if i can find it.
i couldn't on KB but here is the thread it has the part numbers for the baskets.
https://www.thumpertalk.com/forums/t...-close-ratios/
plus the cluster drawings.
people were making up straight cut primaries for the rd and rz using stock yamaha parts

One i think was a YZ490 (looks like it was SR500)with a gear from another bike.
http://www.2strokeworld.com/forum/in...p?topic=4903.0