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Author Topic: Kymco ZX50  (Read 102710 times)

wordslinger

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Re: Kymco ZX50
« Reply #495 on: May 13, 2010, 01:16:49 AM »
...squish....wtf ???...
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sidthesloth

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Re: Kymco ZX50
« Reply #496 on: May 13, 2010, 01:18:03 AM »
I don't think there is an issue with the reeds,from Gordon's book it is normal to get some back and forth flow, I think my problem might be simply too much oil, when I pull the jug there is plenty of oil in the crankcase. well must take this little beast for a spin, purely for tuning purposes, of course.
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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 #497 on: May 13, 2010, 01:19:48 AM »
Quote from: wordslinger on May 13, 2010, 01:16:49 AM
...squish....wtf ???...

Dang 4T guys sneaking in with their silly questions again! ;D

Sid, if you lean out the oil a little you may gain a little performance as well!
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sidthesloth

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Re: Kymco ZX50
« Reply #498 on: May 13, 2010, 01:22:43 AM »
Now you're talkin'. well, must scoot, the sooner I use this tank and the next I can run a new mix, with her current thirst it won't take long.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

wordslinger

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Re: Kymco ZX50
« Reply #499 on: May 13, 2010, 01:23:20 AM »
...dang...just wtf IS a squish??????
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Shaka

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Re: Kymco ZX50
« Reply #500 on: May 13, 2010, 01:24:29 AM »
Lol!  The squish is the distance between the outer top edge of the piston at TDC and the head. 
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wordslinger

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Re: Kymco ZX50
« Reply #501 on: May 13, 2010, 01:25:28 AM »
..cool!!!

..wonder what my squish is.......
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Shaka

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Re: Kymco ZX50
« Reply #502 on: May 13, 2010, 01:28:48 AM »
Idk, does a 4T have a squish?  I suppose it does in some way or another.  Better pull your head and measure Slinger! ;)
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wordslinger

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Re: Kymco ZX50
« Reply #503 on: May 13, 2010, 01:30:29 AM »
..yeah, i'll get right on that............
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sidthesloth

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Re: Kymco ZX50
« Reply #504 on: May 13, 2010, 01:32:00 AM »
If your engine is running ok don't remove your head ;), the squish is designed to stop detonation in 2 stroke engines to enable using a higher compression ratio. I hope i got that right, sorry if it is wrong.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

wordslinger

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Re: Kymco ZX50
« Reply #505 on: May 13, 2010, 01:34:28 AM »
..i think i'll probably leave my squishy head alone...
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Shaka

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Re: Kymco ZX50
« Reply #506 on: May 13, 2010, 01:37:52 AM »
I think that's about right Sid.  It is a band that runs around the perimeter or the combustion chamber.  It actually creates a high velocity flow towards the center where the spark ignites the mix.  It keeps the flame front away from the piston and focuses it upwards.  I think that is right?!  I think think it has the same type of effect on a 4T, could be wrong though!
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zombie

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Re: Kymco ZX50
« Reply #507 on: May 13, 2010, 02:18:00 AM »
What reeds do you have? Do you know the thickness? My guess would be they a fluttering at higher rpms. The jug is moving alot more air, and the reeds may not be quick enough to react. I never like to go thicker on reeds, but you may need a stiffer set. There is also a huge difference in reed stock. I ALWAYS run Boysen. I have .029" in mine, and w/ the extra cc's you have I would think .030" would work well.
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Shaka

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Re: Kymco ZX50
« Reply #508 on: May 13, 2010, 03:57:00 AM »
I think that is probably more likely the cause.  I figured it may be something with reeds!
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sidthesloth

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Re: Kymco ZX50
« Reply #509 on: May 13, 2010, 11:30:54 AM »
Hopefully I won't need to change the reeds, will just try the leaner oil mix and see how it goes, when I get a chance I will read that section of the book again, I'm sure he mentioned that flow through the inlet tract, though I may have misread it. Had the original starting problem today, checked spark, when I finally found it, it was weak, here we go again.
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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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