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Author Topic: Kymco ZX50  (Read 101977 times)

wordslinger

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Re: Kymco ZX50
« Reply #345 on: April 15, 2010, 10:46:40 PM »
Quote from: zombie on April 15, 2010, 10:44:49 PM
Yeah Slinger was posting the time of day to get props. At the tone the time will be 6:66

..temperature--12,000 degrees...

..do you know where your heathens are??
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..every mod (action) necessitates a (reaction) mod..

sidthesloth

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Re: Kymco ZX50
« Reply #346 on: April 15, 2010, 10:56:47 PM »
Hmm, beware
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

sidthesloth

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Re: Kymco ZX50
« Reply #347 on: April 16, 2010, 09:55:43 AM »
G'Day All, today I managed to speak to a bloke at the local bike shop who is held in high regard and he says he will machine the jug if I want him to, says about 3mm spacer should get it about right. When I said about 100cc oil/300cc petrol he said "wouldn't run".
Still some hope yet. Haven't heard from the seller again.
A bit sad when you make senior member on one build, maybe I could resign as Sid Junior and reclaim some of that youthfulness. :)
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

sidthesloth

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Re: Kymco ZX50
« Reply #348 on: April 16, 2010, 10:28:34 AM »
Just had another look at Josh's 125 upgrade on scooter invasion, he has what he is calling wacky port durations. Now that I am a little more enlightened it would seem that he has the exact opposite problem to what I have, his ports being too high. On a brighter note for me is that at least I can try to cut a spacer to put under the base and get the top machined to suit. It may be frustrating but at least I am learning something. "Never too old to learn" they say. :)
« Last Edit: April 16, 2010, 10:34:32 AM by sidthesloth »
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

zombie

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Re: Kymco ZX50
« Reply #349 on: April 16, 2010, 05:39:48 PM »
That sounds like the correct approach sid. Give shaka a little minute w/ the program, and hopefully he can work out the timings with different jug heights. Just guessing is no good, but if 3mm gets the ports exposed. it is a great start. Keep in mind you will need a gasket above, and below the spacer. From your experiments tho that sounds like the right way to go.
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sidthesloth

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Re: Kymco ZX50
« Reply #350 on: April 16, 2010, 09:19:45 PM »
Yeah, I cant do it straight away, being Saturday. when I do get the material I will have to work out how to cut it,was thinking jigsaw.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

zombie

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Re: Kymco ZX50
« Reply #351 on: April 16, 2010, 09:50:24 PM »
Well, aluminum would of course be best. A jig could do all the rough cutting, and a Moto Tool is great for finishing to the lines. If there is a shop that does water jet cutting near by you, you could hand them the paper gasket, and have 1 cut for you for around 30 bucks. Either way it sounds like the right approach.
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"They have nothing in their whole imperial arsenal that can break the spirit of one Irishman who doesn't want to be broken."   Bobby Sands...

sidthesloth

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Re: Kymco ZX50
« Reply #352 on: April 16, 2010, 10:09:59 PM »
Well, it sounds like it will be the jigsaw, but it also sounds like an excuse to buy a die grinder. I dont mind doing these sorts of jobs, it just takes time.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

zombie

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Re: Kymco ZX50
« Reply #353 on: April 16, 2010, 10:19:57 PM »
Yeah! I like it myself, or couldn't you tell...
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"They have nothing in their whole imperial arsenal that can break the spirit of one Irishman who doesn't want to be broken."   Bobby Sands...

Shaka

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Re: Kymco ZX50
« Reply #354 on: April 16, 2010, 11:16:18 PM »
Sid, you are correct that Josh has the opposite problem as you, but he is also running a stroker crank.  I haven't had any more free time to sit down with the program.  I will try and find some this evening.  That great you found someone willing to do some machining on your engine for you!  All we have to do now is figure out exactly where and how much is needed! 
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sidthesloth

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Re: Kymco ZX50
« Reply #355 on: April 17, 2010, 12:14:11 AM »
G'Dax Shaka, my current setup is base gasket compressed is  1.05, top of cyl. to piston @ b.d.c 41.7. thanks for doing this, a chance to try your new software I guess.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

Shaka

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Re: Kymco ZX50
« Reply #356 on: April 17, 2010, 12:49:50 AM »
I'm working on it right now.  Been doing a lot of reading of Bell's book.  Good stuff!  I'm trying to learn how to interpret all the information the software is giving me.  Numbers are all useless unless you know how to use them! ;)  The 41.7mm from top of cylinder to piston at BDC sounds about right if you have a -0.35mm deck height and a stroke of 41.4mm.  There is an extra 0.5mm somewhere in there, but I'll work it out.  This is definitely giving me a good chance to learn the software before I use it on my own cylinder.  Thanks for being the Guinea Pig Sid! ;D
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sidthesloth

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Re: Kymco ZX50
« Reply #357 on: April 17, 2010, 01:14:32 AM »
Funny that, some say I'm a gimme pig.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

Shaka

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Re: Kymco ZX50
« Reply #358 on: April 17, 2010, 02:10:39 AM »
I'm think I may be getting somewhere with the numbers!  I just asked the help of Step Vino on Scooter Invasion.  He is the person who actually wrote the software!  From what I can tell your port durations are way off.  I think mostly because the ports are well below the cylinder at BDC.  I think approx. what needs to happen is to put in about a 2-2.5mm base gasket and make the ports themselves a little taller.  The exhaust by about 2.5mm and the others by about 0.5mm.  Then you will need to have the top of the cylinder shaved maybe 1mm and possibly the head as well.  Whatever is required to achieve the proper squish. Here are your current specs as far as I can tell:

Bore: 50.0
Stroke: 41.4
Conrod: 80.0
Deck Clearance: -0.35
Exhaust PortTop-BarrelTop: 24.35
MainTransfer PortTop-BarrelTop: 33.00
AuxTransfer PortTop-BarrelTop: 33.00
Boost PortTop-BarrelTop: 32.66
Exhaust duration: 172.9
MainTransfer duration: 118.0
AuxTransfer duration: 118.0
Boost duration: 120.5

 My understanding is you want your exhaust duration at about 192 and the transfers at about 130.  I'll let you know when I find out more. 
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sidthesloth

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Re: Kymco ZX50
« Reply #359 on: April 17, 2010, 02:20:16 AM »
Bloody amazing. thanks Shaka
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

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