Two stroke Efi (#14)

Number-One · Post by **Number-One** » Sun Jan 05, 2014 8:35 pm

Hello.
This is my project. I´m converting a 50cc sachs engine to 100cc Efi.

Original engine is like that

my itb

fuel pump

my engine converted to liquid cooled

https://svn.code.sf.net/p/rusefi/code/trunk/firmware/config/engines/sachs.cpp

Post by **AndreyB** » Sun Jan 05, 2014 9:18 pm

The VR board you have asked about is http://www.jbperf.com/dual_VR/v2_1.html

Update:

Number-One · Post by **Number-One** » Sun Jan 05, 2014 9:21 pm

Thank you.

kb1gtt · Post by **kb1gtt** » Mon Jan 06, 2014 12:24 am

Nice. Looks like you are going liquid cooled as well. Do you know what pressure you get from that fuel pump? It looks much nicer than what I did for my small engine. Do you know what kind of current it draws? I'd bet it draws less than mine is drawing.

Number-One · Post by **Number-One** » Mon Jan 06, 2014 7:00 pm

Hi, pressure i don´t know yeat. In normal utilization arround 300/400 ma. This is original from a Honda cbf125, i think cbr 125 uses similar pump but inside of the tank. Cbf 125 is outside of the tank.

kb1gtt · Post by **kb1gtt** » Tue Jan 07, 2014 12:34 am

Your probably going to need an external regulator, it doesn't look like that's got a regulator. They seem to sell such items here http://www.ecotrons.com/products/small_engine_fuel_injection_kit/

Number-One · Post by **Number-One** » Tue Jan 07, 2014 10:27 pm

No, this pump already have a internal regulator.

skeeters_keeper · Post by **skeeters_keeper** » Tue Jan 07, 2014 11:43 pm

Neat project! I like my air cooled motorcycle (Moto Guzzi Breva) for simplicity.
Some day I may try converting my carb'd '90 Kawasaki Ninja to EFI just because, but for now the carbs are doing a good job.

What is the motivation behind the changes? Or "just because"?

Number-One · Post by **Number-One** » Wed Jan 08, 2014 8:06 pm

skeeters_keeper wrote:Neat project! I like my air cooled motorcycle (Moto Guzzi Breva) for simplicity.
Some day I may try converting my carb'd '90 Kawasaki Ninja to EFI just because, but for now the carbs are doing a good job.

What is the motivation behind the changes? Or "just because"?

Only for fun, and to do different. One old bike like a fresh bike.

Number-One · Post by **Number-One** » Wed Jan 08, 2014 8:43 pm

kb1gtt wrote:Nice. Looks like you are going liquid cooled as well. Do you know what pressure you get from that fuel pump? It looks much nicer than what I did for my small engine. Do you know what kind of current it draws? I'd bet it draws less than mine is drawing.

Pressure 250kpa, found this today.

Post by **AndreyB** » Sat Jan 11, 2014 2:23 am

Wow!

kb1gtt · Post by **kb1gtt** » Sat Jan 11, 2014 11:23 am

Nice, looks like it was fun, and very clean. I like the gauge display.

Number-One · Post by **Number-One** » Sat Jan 11, 2014 6:27 pm

This white is one of my bikes. This is a Casal, made in Portugal.

Number-One · Post by **Number-One** » Sun Apr 13, 2014 6:23 pm

Let´s start close the engine.
New handmade crank stroke 46 (original is 44)

New gearbox , on the left is the original , on the right is the new one (sachs 125),same as Penton, Dkw, Hercules etc

New cilinder, original vs new watercooled (44mm bore vs 54)

News soon

rus084 · Post by **rus084** » Sun Apr 13, 2014 6:48 pm

this engine look like GY6 ?

what about your hardware?
what is fuel injector you will use?

Number-One · Post by **Number-One** » Sun Apr 13, 2014 7:47 pm

No, gy6 is a 4 stroke, my engine is a old 2 stroke sachs.
I will use this itb (Honda cbf 125)

fuel pump

rus084 · Post by **rus084** » Mon Apr 14, 2014 11:06 am

you engine was 67cc ?
now its 105cc

new cylinder looks much better, and the scavenging ports quite effective.
yes, quite unlike the cylinder GY6 1P40QMB

you'll make a new cylinder head?
Oxygen sensor to put you?

Number-One · Post by **Number-One** » Mon Apr 14, 2014 9:32 pm

rus084 wrote:you engine was 67cc ?
now its 105cc

new cylinder looks much better, and the scavenging ports quite effective.
yes, quite unlike the cylinder GY6 1P40QMB

you'll make a new cylinder head?
Oxygen sensor to put you?

Original 50cc. I will use a yamaha cylinder head. Oxigen sensor i don´t have , i can´t use it once this engine is 2 stroke.

Number-One · Post by **Number-One** » Wed Apr 30, 2014 9:44 pm

Ready to fit the engine

Post by **AndreyB** » Wed Apr 30, 2014 10:27 pm

My wife was passing by, she saw the pic and sad: "No way you are getting a bike"

Number-One · Post by **Number-One** » Wed Apr 30, 2014 10:36 pm

Hope she said " oh beautiful bike ".

Post by **AndreyB** » Wed Apr 30, 2014 10:50 pm

more like "oh beautiful COLOR, but don't you dare think about a bike"

kb1gtt · Post by **kb1gtt** » Wed Apr 30, 2014 11:13 pm

Very nice very nice. You make me want to start the work on my Jawa.

rus084 · Post by **rus084** » Thu May 01, 2014 6:56 am

I have two stoke engine chainsaw "drujba" , but inginion is not working ( i have CDI rotor, but Mount does not fit else contact a woodruff key rotor broke )

puff · Post by **puff** » Thu May 01, 2014 7:31 am

jawa! my dad had jawa somewhat 30-40 years ago. didn't know they exported it to the us. could you share some pics of it?

Number-One · Post by **Number-One** » Tue Jun 24, 2014 8:13 pm

In progress

Engine

rusefi

Number-One · Post by **Number-One** » Sun Nov 02, 2014 9:21 pm

Trigger wheel and sensor.

Post by **AndreyB** » Sun Nov 02, 2014 11:03 pm

Do you have VR circuitry ready? You should be able to spit it by hand and see some LED flashing - if you have an LED

Number-One · Post by **Number-One** » Sun Nov 02, 2014 11:19 pm

My Frank board isn't ready to test.

Post by **AndreyB** » Mon Nov 03, 2014 12:03 am

Number-One wrote:My Frank board isn't ready to test.

You only need ~15 components to test VR input

rusefi.com

[rusEfi] Two stroke Efi (#14)

Two stroke Efi (#14)

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