3 port or 5 port please?

[zoltan007]

Hi folks - got a 2001 px125 which has a bit of scoring in the barrel after a seize some time ago (due to faulty oil supply)
Faced with so many options (rebores, over sizing, kits) I've decided to have top end replaced with standard 150 set up (barrel, piston and cylinder head). Question is, should I be looking at 5-port or 3-port?
I'm a relative noob to all this (been riding about 2 years). Hope this isn't too daft a question. Cheers as ever for your advice

[henri]

yours has 3 transfer ports from cases to barrel, so would be 3 port as stock, a lml has split ports in barrel an is counted as a 5 port barrel, either will fit on your cases ,with a choice opt for the 5 port barrel, but for samish money a dr180 kit is available , motortime2012 on e bay , bout 80 quid delivered ,
tho a 3/5 port stock barrel will work with your exhaust ,where as the dr would really need a sip road 2 at least , H

[zoltan007]

Cheers again henri. I'm running a sip road 2.0 as it goes. I was put off getting a kit as I figured I might need upgrades elsewhere (crank for example).I'm happy with performance as is but seeing as I need to change top end anyway I thought I'd just go for a straight 150 swap for 125. So 5-port sounds like what I should get (I assumed wrongly that they were for lmls only).
Get me India on line 1

Cheers again henri

[rab]

Only other upgrade with what you have and using the Dr is an up jet from standard to 98 100 or as mine is a 102 if it's not already had it done

[henri]

as rab says ,no need to swap cranks ,thats a smallframe deal, same carb n keep the sip pipe an just upjet ,which you'll have to do anyway goin 150 from 125 , i'd probably buy a jet kit an start bout 105 an work down but as rab says you'll prob end bout a 102 or even 100 , pre-mix or auto lube adds or subtracts 2 sizes ,pre mix up 2 , auto jet same as a px150e , go on go dr ,you know ya want too , H

[zoltan007]

I love this place.

Ok - if I went DR, would/should I have any port-matching or chamferring done to get full benefit?

[henri]

to get most of kit you could follow sime66's thread an go all out on it , for best stock it really should be matched to cases at least , but for just a improvement from stock it can just be bolted on out the box , H

[sime66]

Ha ha! I’ve been wondering whether to get involved in this one, but as Henri brings my current project up, here we go!....................



Seriously though - there is a great difference in response, depending on whether you want a reply to the would or should question – it’s up to you really.

Firstly point: I looked at whether to get a 150 or a DR180 about four months ago, and I could see no 150 cc top-end (even/especially from India) that looked more sensible or better value than getting a DR direct from Italy. The supplier I used has either sold out or stopped selling them so cheap, but the link Henri posted before looks about the same price.

Second point: Yes you can just bung it on and hope you get some good numbers from it; you will definitely notice and appreciate the marked improvement,
OR (for the ‘full benefit’ part of your question)
You can put a bit of work into it, do a bit of learning, know your port timings from measuring and adjusting to suit, and do a bit of work on the casings and barrel to match them.

There isn’t a definite answer; you need to decide for yourself; I have one just bolted on in my scooter now, and I’m building one with a tailor-made, designed tune for my own needs. Waste of my time and money? Or good-practice and worth learning? Don’t know yet, but I value the opinion of the experienced chaps giving me the advice to do it properly – and the best way (for me) to decide, was to have a go and see if the results are worth the effort – watch this space; I’m still building it:

vespa.proboards.com/thread/4621/comparing-px-efl-gearboxes

Now, that's about all I have to say on it until I’ve reached my own conclusions after I’ve completed the tune/build exercise, changed engines over and ridden-it-about-a-bit. 

[rab]

you will get a good reliable scoot if you just bolt it on as long as you do the jets to match the head pipe and drilled filter. you can go down the other road wich is a deep pocket job for all the upgrades done . as ive said a few times before and unless like H and SIME you do it for the love or just to see were it leads if you want more than basic upgrades wich i class as head/ pipe/ jets/ filter and a 21 tooth clutch as a final upgrade then buy a 200 lump it will be safer and faster and more reliable and work out cheeper

[henri]

as rab says , basically the "worm can" holder was a clean handed scooterist ,but from promptings from me n other deviants is slowly becoming a "true sheditte" , as to the worth off that sime ,my answer is ,ya brains a muscle , use it or lose it , a skill learned if even never used again can be applied in other areas of ya life , an knowin what ya ride is all down to you is a joy beyond price or measure ,
but as rab says ,given the price diff, bout 15 bar , its really a no brainer , even if just bolted on the dr kit will be better than stock , an worth the money , if even in only braggin rights ,what do ya prefer a stock px or a "kitted scoot" H