A55 port map and porting info

Did some searching and will probably put this on the wiki. Also did a port map of a stock jug since I couldn't really find one.

A55 wiki page: http://www.mopedarmy.com/wiki/Tomos_A55_Performance

This thread has good info on porting/tuning the stock carb from Jesse along with stock port durations: https://www.mopedarmy.com/forums/read.php?7,2077859,2077971

Here's a guy planning on doing some A55 porting based off Jesse's suggestions: https://www.mopedarmy.com/forums/read.php?7,2083094,2083094

Marvin Yee chimes in here on porting: https://www.mopedarmy.com/forums/read.php?7,2084579,2084735

Good reading on ignition and general stockish a55 mods... https://www.mopedarmy.com/forums/read.php?7,1870109,page=2

good stuff on porting and ignition here... https://www.mopedarmy.com/forums/read.php?7,1962769,page=2

Wish the pictures in this one still worked. :( https://www.mopedarmy.com/forums/read.php?7,2058434,2058774

Re: A55 port map and porting info

haha good old thread from years ago.

i put a small window on the tail of my piston intake side for more duration, and i just kinda went .5mm on the sides and front of the exhaust port and matched the outlet to my technigas.

it got a little more rpm.

Re: A55 port map and porting info

Jake P Wrote:

-------------------------------------------------------

> Did some searching and will probably put this on

> the wiki. Also did a port map of a stock jug since

> I couldn't really find one.

>

>

> A55 wiki page:

> http://www.mopedarmy.com/wiki/Tomos_A55_Performanc

> e

>

> This thread has good info on porting/tuning the

> stock carb from Jesse along with stock port

> durations:

> https://www.mopedarmy.com/forums/read.php?7,2077859

> ,2077971

>

> Here's a guy planning on doing some A55 porting

> based off Jesse's suggestions:

> https://www.mopedarmy.com/forums/read.php?7,2083094

> ,2083094

>

> Marvin Yee chimes in here on porting:

> https://www.mopedarmy.com/forums/read.php?7,2084579

> ,2084735

>

> Good reading on ignition and general stockish a55

> mods...

> https://www.mopedarmy.com/forums/read.php?7,1870109

> ,page=2

>

> good stuff on porting and ignition here...

> https://www.mopedarmy.com/forums/read.php?7,1962769

> ,page=2

>

> Wish the pictures in this one still worked. :(

> https://www.mopedarmy.com/forums/read.php?7,2058434

> ,2058774

>

> http://i34.photobucket.com/albums/d123/jakeperkio/

> a5550ccportmap.jpg

The Pic of the Ports, is that for a Stock Cylinder? I have the AirSal 65 cc cylinder and have cleaned it up but do not want to raise the Exhaust hole and remove Bottom end! I want to make as MUCH power Possible using as low of RPMS as possible! I widen my Exhaust a MM on each side and I re-angled the direction of 1 side of the transfers by about .5 MM to keep the flow from directly hitting each other but now pushing each other up and forward. I raised the Bottom of the Piston Skirt on the intake side 1 MM and champered the edge to keep the Piston from snagging on the Port edge.

I am geared 28 / 22 and peak rev limited to 51.8 MPH. I was using a stock carb (74 main, 30 Idle 210 infuser and 3rd from the top needle and unifliter stuffed in the Modded Airbox with 9-3/8" holes on the Rear Bottom and sides) Tecnigas Next R Exhaust and 050 Squish Head running 150 PSI

I have bought a Dellorto 17.5 and plan to insrtall and jet it this weekend!! (edited)

Re: A55 port map and porting info

50 is so easy on an a55 its like cheating just clean it up put any pip with an inch or 2 out of it a bit of gear and do 50

Re: A55 port map and porting info

Bryan Colliver Wrote:

-------------------------------------------------------

> 50 is so easy on an a55 its like cheating just

> clean it up put any pip with an inch or 2 out of

> it a bit of gear and do 50

Yes, But I want to get there Quickly AND not slip a lot of clutch in the process :)

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