ESE's works engine tuner

[F5 Dave]

So how big was VBs? 125?

[husaberg]

[IMG]

The MXS GP90 is a 50mm bore that is matched up to a 46mm crank. Still a bit of an over square (which both Frits and Jan repeatedly state is bad for a stroker), but its closer to a square engine then most of the big bore kits available for the various Bats bikes. One has to wonder though--if they had made it a 46mm bore how much better it would actually perform.

MXS claims to have performed over 3,000 dyno runs developing this top end, and with the proper equipment that 32 HP can be produced with on a Derbi EBE050 engine--that would really test the little transmission. There's a lot of innovation brought market with this top end. It will be available in February 2013 and versions made for the EBE, D50B0, AM6, and probably a couple of other 50cc engines. You do need to get their crank for it (some of the engines sport a 45mm stroked crank), and you'll need a big pipe and a huge carb.

Originally Posted by poorly translated by Google
MAXISCOOT and MXS Racing (competition MAXISCOOT Department) are proud to present to you the fruit of many years of development: the pack cylinder crankshaft pot MXS 46mm Derbi GP90 race Euro2! You are of course offered at a great price!

With an original design patented, pot pack cylinder crankshaft 46mm stroke Derbi GP90 MXS Euro2 has a displacement of 90cc (50mm diameter / 46mm stroke).

Its exclusive mounting system developed by MXS RACING design allows transfers intake and exhaust duct completely new to this type of high engine "mécaboite 50cc!"

Indeed, on the cylinder studs are not replaced a patented hollow screw heads now only its base. Aluminum caps followed in times and places of traditional studs. These plugs will fit the shapes transfers intake and exhaust design thus allowing completely "free" those parts of the cylinder.

Another exclusive MXS: the stud bolt has a slot allowing it to remain fixed on the valve cover, this preventing it from rotating when removing your candle preserving your o-ring.

Designed specifically for drivers of high competition, this pack cylinder crankshaft pot MXS 46mm Derbi GP90 race Euro2 achieves very high performance!

With the right parts and associations through its many innovations, high engine develops an output of about 28 to 30 horses without any modifications. The exclusive design of its transfers also provides a "couple" absolutely phenomenal (18Nm) and at low speeds!

This pack cylinder crankshaft pot MXS 46mm Derbi GP90 race Euro2 is extremely efficient at startup, acceleration and speed. Its reliability is also a "high-end" through careful design and use of high quality materials (made in Europe). Its cooling capabilities have receive a lot of attention from MXS who designed the mold of the cylinder so that the coolant flows perfectly around the exhaust pipe (the hottest point of the cylinder).

It is essential to use this pack with fuel with an octane rating of 100 to assure him power and reliability! You will also associate a carburetor at least 30mm (38mm is ideal), a clutch of competition "upscale" with a maximum of discs, competition gearbox (Bidalot) and a digital ignition rotor internal (Stage6 R / T or Bidalot).

Warning: you will countersink slightly in front of your crankcase for the passage of the rod as well as the bottom of the piston (map included).

It is possible to get more power with the cylinder using the stud bolt "competition" sold separately (only the essence of competition!), Bringing the power up kit from 30 to 32 hp .

*

Power of about 28 to 30 horses (without any changes)
Exclusive Design transfers for a "couple" absolutely phenomenal at low speeds (18Nm)
Made in Europe
Stud bolt guided by pin
Water circulation system optimized
*

The package included the following:

The crankshaft MXS Derbi GP90 Euro2 EBITDA (stroke 46mm)
The pot MXS Derbi GP90 Euro2
The cylinder head MXS Derbi GP90 Euro2
A set of crankshaft bearings with oil seals

Michael Burgard
http://www.bayareatwostroke.com/foru...ead.php?t=3666
i will fastly introduce my self
my name is Michael iam from germany and i do develope 2stroke parts for Maxiscoot.......
its intresting to see that you compare the MXS cylinder with the RSA ones........
perhaps there are some similarities but its not at all similar..........
i now verry good the architecture of the RSA cylinders......and Frits is a frend of me..... i only took a little bit inspiration of the RSA cylinder this you can see verry good at the exhaust......but transfers and exhaust design is the result of 2 years developement.........

so if you got any questions about this cylinder......ask me


regards Michael

That's cheque book "racing"

[F5 Dave]

Bit of Devcon & I could fill in the writing & fashion "Street legal" into the barrel. Right, where's that stolen C.crd? Look at those aux ports. Nice.

[crazy man]

So how big was VBs? 125?

think he realied on 9 dollar a letre fuel . but engine wise was fine

[speedpro]

50mm bore + MB100 crank @ 49.5mm = 97cc, and more or less square.

Now where was that article on the disc valve Honda?

Hand me my cheque book, boy.

[husaberg]

Bit of Devcon & I could fill in the writing & fashion "Street legal" into the barrel. Right, where's that stolen C.crd? Look at those aux ports. Nice.

Nah use the bezona stuff TZ has

50mm bore + MB100 crank @ 49.5mm = 97cc, and more or less square.

Now where was that article on the disc valve Honda?

Hand me my cheque book, boy.

[twotempi]

What works bike ran a aluminum alloy RR77 crankpin with a hardened sleeve. that was reliable for 9500 hard racing miles with a future multiple world champion on it when he fitted one to his production racer model?


John Surtees with a Triumph Cub ?? Or a Vincent Comet Black Shadow ??

[husaberg]

What works bike ran a aluminum alloy RR77 crankpin with a hardened sleeve. that was reliable for 9500 hard racing miles with a future multiple world champion on it when he fitted one to his production racer model?


John Surtees with a Triumph Cub ?? Or a Vincent Comet Black Shadow ??

John Surtees Vincent grey flash (or half a Black Lightning) but yeah i get the joke, but you miss the chocky fish
Burns and Wright lightning spec shadow had 2x ex works Grey Flash front heads....

Seen this today nice product placement

Thats a fair bit of Space was it any more compact than the Swissauto 4

[TZ350]

pretty sure it was said ages ago, if you eat too many pies etc you need to add power to your bike. cut down weight and you’ll be amazed at the performance. Cutdown on the pies, WEIGHT LOSS is the best way to go faster

Actually I think your right, maybe I should have said "took TeeZee to remind us of it"

NOID is right and it was Thomas who recently reminded me to look at the actual power to weight ratio of the faster bikes, and at 30hp and 210kg with rider and gear the Beast is not that flash. Avs is much better and I think the Beast is easily equalled or bettered by Rick, (FarmaKen maybe) and some of the light 4T's.

So we have the hp, now we need to make a lighter bike.



This is FarmaKens bike, MC18 frame and TF125 engine. Its much lighter than the Beast, he let me have a good look and take some photos (and an extra big thanks because he is ok with me posting them too).



Nice little out of the way place for the ignition.




Dinky little lightweight seat sub frame and R6 shock.



3.5 x 17 front wheel from a big Suzuki.



Neat little adapters for the disk and sprocket and light weight caliper.

[TZ350]

More of FarmaKens Bike



Front brake to die for.



Light home made footrest brackets and levers.



FarmaKens chamber with the ATAC valve mechanisim. Basically a slot in a spindle like the Suzuki RG400/500's



The other side of the ATAC valve, the ATAC chamber itself is not fitted in this picture.

I have a MC16 frame and have been collecting wheels forkes brakes etc so I can make something similar, and have even been cutting back on the pies too ....

[Frits Overmars]

[IMG]

Here is the picture that says more than a thousand words: the drawing from Michaels patent application.

[husaberg]

Here is the picture that says more than a thousand words: the drawing from Michaels patent application.

Thanks Frits i guess it would have made much more sense in its original language.......
But i guess you know how much i love pictures by now
.

....indeed, on the cylinder studs are not replaced a patented hollow screw heads now only its base. Aluminum caps followed in times and places of traditional studs. These plugs will fit the shapes transfers intake and exhaust design thus allowing completely "free" those parts of the cylinder.......
It is possible to get more power with the cylinder using the stud bolt "competition" sold separately (only the essence of competition!), Bringing the power up kit from 30 to 32 hp .

my gut says its pure competition part.... is this the case?
Even if i ignore the name.

[Yow Ling]

Thanks Frits i guess it would have made much more sense in its original language.......
But i guess you know how much i love pictures by now
.

my gut says its pure competition part.... is this the case?
Even if i ignore the name.

If you have to buy the "competition" studs seperatly then that would suggest this is a non comptition part and at 379 euro is cheaper than a replate in nz

[Haufen]

Here is the picture that says more than a thousand words: the drawing from Michaels patent application.

Do you happen to know when Michael patented his idea? I have seen such a modification on another cylinder on the internet some time ago (2 years or so). Just thought Michael might want to know that.

[F5 Dave]

Here is the picture that says more than a thousand words: the drawing from Michaels patent application.

The swine. I've seen something similar in a dream a few years ago. Haven't had time to implement & well. . . his is well more advanced than my trying to get around a compromise of a 1979 engine. But I'll sue!