Kymco ZX50

[sidthesloth]

Isabell

[Shaka]

Isabell. . . Who?

Sounds like you are getting closer!  At least now you have a range to work with!  You will find that magic number between 130 & 140.  Try to focus on getting the WOT/main jet set first, then address the mid-range and needle height/taper.  You may need to do 1/2 or 3/4 throttle plug chops once you get the WOT sorted.  The easiest way I found to do that is to take some masking tape and wrap it around the grip.  Mark off 0 throttle, full throttle, then split the difference into 1/4's.  This way you can easily replicate the exact same throttle position for your test runs.

[zombie]

Tell Isabell her MOMMA left her pager on the nite stand...

[sidthesloth]

Yeah, I will get a 133 on Monday and see how that goes.

[wordslinger]

...isabell WHO???

...i can't thinkk of aything good....

..dang hippie grass....

[sidthesloth]

Isabel really necessary on a bike?

[Hoolander2]

Why don't elephants ride bicycles?   




They don't have a thumb to ring the bell. 

[sidthesloth]

G'Day All, put a 132 jet in this morning, seems to have lost performance and also reduced top end. Plug looks rusty.

[Shaka]

130 my be the one to go with.  The 132 may be a little safer though.  I've heard somewhere to find the "best running" jet and go one size larger to be on the safe side.  The performance may have been better because it was running lean.  The lean running condition will give more ummph, but the engine won't last as long.  This is good for racing, but not daily driving.  Was the noise still there with the 132 jet? 

[zombie]

Buy rusty do you mean color or texture? I agree w shaka on being slightly rich vs. lean. Maybe a 131 would be a good compromise. That's why I prefer to cut/solder my own. You would really have nothing to lose by opening one of your smaller jets. also have you tried lowering the needle w/ the 132. the other sugestion would be try the 130 w/ a colder plug. you can try 1-2 ranges colder to really get it dialed in. That will also help reduce the possibility of detonation. sounds like you are just about there tho. Have you checked the jug for any further damage yet?

[sidthesloth]

G'day, No I haven't check the jug yet, would rather wait for a new head gasket as I have allredy had it off once before, though I may try again later. With the 132 jet the noise was still there, but just to see what would happen I raised the needle to the next notch and I reckon by playing with the gearing could get a reasonable compromise with performance. By rusty I meant the colour but that was an old plug, I tried to upload a picture of it but was unable to, something about the upload folder being full.

[zombie]

Your pict. may have been over the size limit. Not dimensions but the file size. I have a hell of a time getting picts. to post. Shaka mentioned running 2 base gaskets to drop the compression a bit. that may be worth a try as well as a colder plug. The hard part is tuning w/ out destroying it. once you get the set up It's Miller Time.

[sidthesloth]

G'Day zombie, I dont think it is the size as it is a different message. I took the scoot to work last night and was not as good as I thought, wanting to cut out when backing off when cold. I will change the plug today, put the 132 jet in tomorrow and like you and Shaka  suggest, I will cut another gasket. I took the exhaust off yesterday to replace the tyre so I had a look in the ex. port with a torch and a mirror. Though there were signs of heat on the piston there didnt seem to be any visible damage. with these changes I want to do them 1 at a time so I know what is doing what.

[zombie]

That's the right approach. Do you know if it was too rich, and trying too stall, or too lean and not getting a "charge" to fire. Did it just pick back up w/ throttle, or sputter then pick up?

[sidthesloth]

By the way, the tyre I put on was a Continental "Conti Twist", 120/70/12. (standard size).