Piaggio zip 50cc porting.

I've had ago at just inlargin a old 50cc exhaust port don't know what to do with the others so need to look into them. But is there anything you need to change ? if so where do I get them from. Thanks . (Gaskets etc)

 

dont start cutting your cylinder about, you dont know what youyr doing, you wont get any gains and it will die alot quicker


buy a 70 kit an stop messing around wiht thigs you dont understand... blunt advice, but the best your gonna get

 

Yer I know, It's not a kit i'm gonna use anymore. I'm just practicing.

 

so buy some books on 2 stroke tunning to acompany your heavily involved modding of internal componants... need a little more info than your gonna get on a forum if you want to start porting kits...

 

Sorry to be a pain but any recomendations ? Would be a lovely skill to learn

 

roy bacon (expensive, but really concise with the different types of scavenging princaples/practices) theres a good few.. bigger librarysa will have something interesting. or do what anyone seriously considdering learning does and buy them. PLENTY about, theres no such thing as a bad tuning book

 

Thank-you. Well I'm hoping to do bikes as my hobby and do I.t to fund it, So if I want to get the most out of small engines, Need to learn these. Thought it would be easier to learn this first than flowing Thanks for the help. I've got some Photo's of my first attempt on a kit I had lieing around which is totally buggerd, Can you tell me what you think ?

Started With this after a clean up.



Then progressed onto this. I think i've buggerd it up.I've not got round to final measurements.My Internal Micrometer has gone missing :banghead:











I know i'm going to get told i'm fucking useless or I should never touch a moped again. But fuck it, Only way to learn in my opinion lol.

 

got the right idea opening the port to match the olive fitting (the chamferd section surrounding the port) dont touch this tho as its what stock/shit exhausts matt up to. as youve done be sure to remove material ALL THE WAY back to the port face or theres no point doing it. if you wish to remove the olived exhaust and make the port as big as possible you can do just remember it wont run any stock type exhaust, you will need to use a flat stub pipe and match the port diameter to this... transfer feeds are a little messy but you have the right idea.. the middle's need to come out tho and you want to try and keep the shape as constant as possible.. again, fuck all point unless it matches the case its being fitted to (both in size AND angle of the matching faces)

in whole.. you would see some gains from this, but not the gains you should see from the same ammount of work. needs finnishing off but for practice its not a bad attempt

 

Wow. i've not fucked something up 100% for once. And yeah is abit rough but this is what I did in a day, need to spend more time on it, I've got a TT at the min. But this is just a practice kit, got a standard polini sport on there. I know abit about flowing. About opening the cases to match the ports.Or to make it wide to fit bigger kits, cause Piaggio cases are shockingly rough from the look of it. It's the chemical metal part I don't get haha.

 

plenty of pics in a few build threads in projects... just dont run befor you can walk.. easy to fuck a lot of money's worth of bits by taking a dremmel to them unknowingly grinding away.

thje stock cases are pritty poor for performance but amazing for econimy.. the idea is to fuck off fuel econimy and part life and just go as fast as possible.. hence you grind fuck out of them, then refill the holes with chemical metal (yes theres so much to come out you make big holes all over the place) but ye, study pics./.. ask questions. preobably best to put something into scooter tunning as this is hardly a newbie subject.

 

Haha. I don't know what to class myself as half the times lol. Thanks i'll look into some pictures. When I eventually get round to build my engine going to get it flowed properly. Don't want to be wrecking lots of money. Got 4 spair sets of cases to practice on at some point. Going to get the porting down first. Thank-you very much for the help. Nice to know someone knows what on earth there onabout for once.

 

easy way to make things a little wider on narrow kits like this is a peice of cling film, something flat (or a laminated peice of perspex as ive used....) clamp it in place. apply chemical metal, let it dry.. remove plastic and peel off the coating/cling film.... makes a silly thin kit not so silly thin.





should get you something for the gasget to sit on

 

Thanks Looks like i've still got a lot to learn. Wierd to think last year I couldn't figure out were the rollers go (Shocking I know!) too this haha.

 

you learn by doing it wrong (well i did anyway) just seems like you care less about the parts in your hand than the want to learn.

get some books, get reading, wealth of knowledge in there (other people have made all the mistakes too, so go learn from them befor you waste any more money cutting up good parts) by knowing what not to do you end up with some kind of winning plan and id say for now, dont do that again right idea, well done for having a go, but deffo get some reading in and gather as many pics of work as you can

 

Going too, Don't really matter if I fucked these kits up this sport had a major malfuntion and got a 4mm scratch through it and got of a couple of buggerd 50's lol. Aint going nere my own kits haha. Been given these. But yeah going to do some looking about and bye some books haha. Going to be a pain in the ass though as i'm dislexic :L Well when I read a book I am anyway. Thank god for pcs's.

 

dyslexia is a condition that slows your ability to read... doesent make things impossible certianly doesent stunt the ability to understand..

most tunning books arnt like reading a normal book, you read a line, think about it for 20 mins, then re read it just means you will spend that extra 10 seconds reading the line


weigh up the cost of a rebore/new piston to the cost of a new corsa kit.... if the later works out more expensive then the kit you class as junk may still be usable iron kits are pritty forgiving, unless the gudgion pin has had a nice old ride on the wall of the barrel it may be usable after a rebore/new piston

 

Okay I shall do, Took me 4 weeks to read harry potter when I was younger haha. And I was atempting to read that constantly haha. And umm well something bounced onto of the piston and put 1mm gashed in the piston and the top cap, the rings ended up being weleded to the piston and same thickness of the piston, there's a giant scratch under the rear port, and loads of little brown marks which I can't clean off haha. I'll look at a re-bore. I do have a standard sport though Still looking into the stage 6 race engine build though.

 

best way to see how to make a barrel fast is to buy the fastest barrel you can afford, find one that shares the same port layout and copy it...

for instance, the airsal t6/racing or the dopler s7r can be made up to evo polini spec fairly easily..

 

I shall be looking into it now. Got a few weeks to myself so going to see if I can figure everything out and, Try get the rest of my ideas together and post a project up