ESE's works engine tuner

**ceci** · 21st October 2019, 08:21

Originally Posted by jamathi

Nothing new.
A description with scientific words about copying a Honda cylinder.....

The reality is that the university of Valencia NEVER contributed ANYTHING to engine development.

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I thought the copy was from yamaha (by the exhaust valve)
It is not from the University of Valencia, it is from the University of Barcelona (greater connection with the factory because it is from the same city)

**TZ350** · 21st October 2019, 10:53

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Interesting bit of chat with the developer of the first successful TPi fuel injected two stroke:- https://www.drd.co.nz/2-stroke-tpi-conspiracy-theory/

This is the earliest reference that I could find to the original fuel injected Kawasaki BigHorn:- http://www.twostrokemotocross.com/fo...&topic=4884.15

A successful fuel injected YZ250 in 2012 and a VMX Kawasaki two stroke. They sure pre date KTM.

**Frits Overmars** · 21st October 2019, 19:01

Originally Posted by ceci

It is not from the University of Valencia, it is from the University of Barcelona (greater connection with the factory because it is from the same city)

Really?

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**ceci** · 21st October 2019, 20:28

Originally Posted by Frits Overmars

Really?

They are two studies:
The one you indicate, the first one, is from Valencia and is CFD in an aprilia cylinder.
The one that indicated, is from Barcelona and is FEM of a derbi cylinder, and was made in the middle of the competition season to improve the union with the cylinder head.

https://upcommons.upc.edu/handle/2099.1/2737

**peewee** · 22nd October 2019, 03:10

for anyone thats cut in boyesen ports on the yami twin. do you bother welding on any reinforcement to the rear outboard cyl ear to prevent cracking ? or its not a concearn ? maybe i should have reinforced that ear when doing all the other welding but i over looked it. now the final machining is done on the top and bottom decks, gasket thickness and cyl height position is sorted out. . even with bolting the cyl to a heat sink im not confident i could weld any reinforcement and not end up with alittle bottom deck distortion. part of me says go for it and it will be fine

**andreas** · 22nd October 2019, 03:59

Maybe someone can give some pointers cause I'm an electrical analfabet. in this Motoplat ignition where is the cdi, does it have a curve? Can I use this coil/cdi with a pick up rotor? Lastly will it work to rotate a pick up ignition the opposite way?

**Haufen** · 22nd October 2019, 06:22

Originally Posted by ceci

They are two studies:
The one you indicate, the first one, is from Valencia and is CFD in an aprilia cylinder.
The one that indicated, is from Barcelona and is FEM of a derbi cylinder, and was made in the middle of the competition season to improve the union with the cylinder head.

https://upcommons.upc.edu/handle/2099.1/2737

PhD Thesis (Valencia)
Is there an english version, too?

**wobbly** · 22nd October 2019, 07:58

Motoplat ignitions are a nightmare to sort out.
All the early versions were straight line , but later they built in an analogue curve like PVL do by varying the source coil winding number.
The actual CDI is in the stator plate , unlike a PVL where its in the coil.
They have an arrow on the stator and only run one direction.
The coil/stator are a matched pair , for the straight line or retard stator.
I did have the serial numbers that identified a retard curve setup years ago, but sorry long gone.
Easy to distinguish though , as only two were made ,dead straight line and a retard curve - so can be strobed .

**andreas** · 22nd October 2019, 08:05

Many thank Wobbly.

**Muciek** · 22nd October 2019, 08:54

Here in eastern eu, back in the day (pre 1989) many ppl did swap motoplats to their racers and they can be run both sides (did that few years ago with two engines), You just need to time the ignition using strobe light . And the "cdi module " is in coil . Some ppl nowadays used coils with cdi from scooters (as spare part since finding original was hard) and it did worked , although there are differences in cdi schematics comparing motoplat and "ordinary cdi's" (thyristor is reversed the cathode is on current/voltage supply side ).
Coil inside photo.

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**breezy** · 22nd October 2019, 09:53

Originally Posted by TZ350

.

Interesting bit of chat with the developer of the first successful TPi fuel injected two stroke:- https://www.drd.co.nz/2-stroke-tpi-conspiracy-theory/

This is the earliest reference that I could find to the original fuel injected Kawasaki BigHorn:- http://www.twostrokemotocross.com/fo...&topic=4884.15

A successful fuel injected YZ250 in 2012 and a VMX Kawasaki two stroke. They sure pre date KTM.

ive just been surfing the net and it seems theirs a lot of 2 strokes making a come back with euro4 compliant engines.. inspired by the excellent development of fuel injection by you know who back in 2012....

**andreas** · 22nd October 2019, 10:39

Originally Posted by Muciek

Here in eastern eu, back in the day (pre 1989) many ppl did swap motoplats to their racers and they can be run both sides (did that few years ago with two engines), You just need to time the ignition using strobe light . And the "cdi module " is in coil . Some ppl nowadays used coils with cdi from scooters (as spare part since finding original was hard) and it did worked , although there are differences in cdi schematics comparing motoplat and "ordinary cdi's" (thyristor is reversed the cathode is on current/voltage supply side ).
Coil inside photo.

Haha, you had me lost at "the thyristor is reversed". well the plan was to buy a swedish made SEM rotor/stator (outer) that has a light source, and I believe will fit my engine physically, then use my spark coil wich is -91. You think it will be worth a try? The coil looks like the one I posted so it might not be the same.

**Flettner** · 22nd October 2019, 11:17

Originally Posted by breezy

ive just been surfing the net and it seems theirs a lot of 2 strokes making a come back with euro4 compliant engines.. inspired by the excellent development of fuel injection by you know who back in 2012....

Yes, GasGas are next.

**Muciek** · 22nd October 2019, 11:29

Originally Posted by andreas

Haha, you had me lost at "the thyristor is reversed". well the plan was to buy a swedish made SEM rotor/stator (outer) that has a light source, and I believe will fit my engine physically, then use my spark coil wich is -91. You think it will be worth a try? The coil looks like the one I posted so it might not be the same.

I think it should work , the foto I posted is the same as yours, just different lighting on photo. If You have any questions about cdi You can pm me , will try to help with it.