Memo to myself : FIRST check all calculations and facts before posting an answer because when it takes too long (15 min) or someone else posts something you loose everything

So from memory :
Do they allow a +3% increase in capacity for the TT500 ? 500 + 3% gives 515 cc.

The alazzurra head has a 10.0 compression, calculated is that a 19.4 cc volume in the head BUT since the piston is domed the volume in the head must be greater. I guess your measurement of 25 cc is correct.

BUT the calculation of the compression ratio isn't ! Should be 513/2 gives 256 cc cilinder and 25 cc head and then (256+25)/25 gives 11.2.
With the cutout of the monster piston that would come down a bit but I don't know what the result will be with the flat machined piston.

Don't forget to check valve piston clearance with the 650 cams : more lift then a 350 cam.

Keep up the wrenching

ciao
ducadini

Hi Filippo...
I have to ask, did you calculate the compression ration before or after you machined the piston?
Regards...
Flattop

HI Ducadini and Flattop 900, thank you for replying.

Without cecking, Tollerance on Italian TT500 is at 5%
Ducadini, you're right on compression calculation, mine is wrong, but we did that short way just to have an immediate feedback an then starting this project, if my calculation was down to 10/1 whe had give up.
And of course we need to check valve clearance.

Flattop we measured the head volume before machining pistons. without considering squish and valve clearance.
Ciao
Filippo

Hey Filippo,

It's in german so You probably need the goegel trensleter

https://www.pantisti.eu/index2.html

Then go to "Technikseite" and then "Verdichtungseranderung einmal anders"

Let us know if something isn't clear

ciao
ducadini

Hi Ducadini
And thank for the link. Amazing site, i will translate and read carefully that article.
Ciao
Filippo

HI everybody!
Just a little update.
I managed to set the electrical/starter system.
Check the starter and the circuit plan i posted above,
Iexcept removed the 15 ohm fuse.
On this link a short video of the system running:
Battery on- start.
https://www.flickr.com/gp/156916018@N06/945Ra4
Ciao
Filippo

Hi Everibody
little update to this tread.
Dry built of the engine, timed, it turn well. still a lot (thousand!!) of minor work to do but proceding.










Ciao
Filippo

Hi everybody
The engine is now closed and phased.
Remain just the semi Carter to be assembled and few minor job.
I also start to disassemble the bike in order to check everything and install the new one.
Ciao
Filippo

Lookin good......almost done!! Thanx for posting!!

Hey, I have to ask, whats the story on the "clown wall"

Thanx,
Clay

Always good to see work in progress, and things evolving. Never give up. MikeV