My 01 CPI MZ

It's show and tell for your custom scoot! Post photos of your project scooters, etc.

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2strokd
Posts: 842
Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Sat Aug 11, 2012 9:31 pm

Trying something different and going from 103cc,s to 95cc,s.

103 54mm cylinder.

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54mm head. (leaking again)

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54 (right)next to 52(left)

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52 has a baby step. This will help it center and seal ;D

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54mm piston

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Still looks good and ran great with one ring Image

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New idea.. 52mm cylinder with metal removed in certain spots and places thanks to a well respected member Image ;)

Its not quite ready yet in these 2 pics
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Cut the piston for better trans flow.

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Got rid of the ex arrow and such

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had to shorten the skirt and open it up for better trans flow.

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Cut and matched base gaskets

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After matching the cylinder i checked the case. Not off as much as i expected. Im not splitting the cases for that!

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After that i decided to give it a good bath.

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Thats all for tonight. Night, night Skeedr. See ya in the morning Image

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The CVT is seriously underestimated by some!
01 CPI Misketo MZ49cc to70 to103cc-Drag scooter
03 Kymco Cobra (SF10)49cc- Daily driver

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2strokd
Posts: 842
Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Sat Aug 11, 2012 9:32 pm

Spent some time checking/changing port durations

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With 2 .80mm base gaskets i was seeing over 200 degrees exhaust port duration. Thats a bit too high for now..


Off with your jug

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Removed one base gasket and saw what i wanted. 198ex/138trans, squish right at .80mm with one .50mm head gasket.. YES! I can use a head gasket now Image

Went ahead and added another head gasket just for break in.. ;)

Came time to tie on the pipe and i saw an alignment issue. I was kind of expecting this as the 52mm cylinder is 2mm taller. 54mm cylinder is 78mm tall. 52mm cylinder is 80mm tall.

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I fixed this by slotting out the mount holes a bit. Now the Peace Pipe is snug and sealed Image
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

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2strokd
Posts: 842
Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Sat Aug 11, 2012 9:35 pm

Here it is with some fire inside Image

http://www.youtube.com/watch?v=59GlrIPEaKY


Sounds and feels stout to rev. Its at base, stock timing too. Getting ready for the first test run soon Image
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

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Areomyst
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Postby Areomyst » Sat Aug 11, 2012 9:44 pm

I like it sir!

What do you feel are the advantages to the new setup over the old?

Thanks for sharing, and for the video too!

Best,

~Josh
"The more a man learns, the more he realizes how little he knows."

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2strokd
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Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Sat Aug 11, 2012 10:16 pm

With the bigger bore cylinders like this we have noticed the transfer tunnels seem to get smaller and smaller the bigger the bore. After all, the OD of the base can only be one size, cant get much bigger without a bunch of work.
We went with the 52mm cylinder as the tunnels seem a bit bigger to start. Then it was ported out very nicely IMO. for what we got.

We are hoping what we lost in cc,s we will gain in flow and RPM. Cant hurt to try.. And with very helpful donors to a guy on a very tight budget. Im honored to instal it, tune it and run the piss out of it :lol:
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

zombie
Posts: 1303
Joined: Thu Oct 08, 2009 11:30 pm
Location: N.W. Florida

Postby zombie » Sun Aug 12, 2012 12:21 am

That is such a bad ass bike Bro! I LOVE it. It make sense to flow as much cfm as possible. I took alot of meat out of my cases to try to match the increase in cc's. I believe flow is more important in hi rpm engines. or they just starve out pf power. I never checked my skirt clearance. I'll have to remember to get that done. I did it on the 50mm, and that thing had torque.
I hope it proves out for you.
Addicted to 2 stroke 50cc:
I don't use the choke. I warm my fuel in a spoon, and inject it into the vacuum line.

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2strokd
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Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Sun Aug 12, 2012 8:15 am

Well thank you kind sir! Work like yours, and other great members here is what inspires me to push it more. Learning as i go and loving it :D

Your post made my day Zombie.. Cant afford to go racing today so im a little bummed. Kind words go far sometimes. :)
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

zombie
Posts: 1303
Joined: Thu Oct 08, 2009 11:30 pm
Location: N.W. Florida

Postby zombie » Sun Aug 12, 2012 2:45 pm

It's all in love of tuning these lil engines, and respect for the brothers that share what they learn. We would all be riding OEM China crap if it weren't for all the good hearted people involved here.
I have to thank you MORE 2strokd! Same for all you mutts that tune. Thank you all!
Addicted to 2 stroke 50cc:

I don't use the choke. I warm my fuel in a spoon, and inject it into the vacuum line.

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Big B NRG
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Postby Big B NRG » Wed Aug 15, 2012 2:47 am

Nice work you did there! You might want to lower the needle (clip higher) and go a little lower on the pilotjet. Your engine would probably run more "crisp".

How much rpm are you getting from this engine?
Will build someday again!

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2strokd
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Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Wed Aug 15, 2012 8:38 am

I think your right! Its rich and you got the ear for it 8) ! Going to do that today.
I raised the clip a slot (lowered the needle) but im thinking a smaller pilot (maybe even main?) would wake it up more. I like it a little rich on the low end, but not this rich!
Also tried advancing the timing and it loved that from idle to max RPM.
Around 12,000. Another tell/tale that its rich.

Here is a fresh plug after 2 passes.

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Thank you for the advice Big B! :D
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

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2strokd
Posts: 842
Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Wed Aug 15, 2012 11:43 am

Squished!

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Only one more slot to go!

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The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

User avatar
Areomyst
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Postby Areomyst » Wed Aug 15, 2012 11:52 am

Go get 'em Robert! :D :D :D

~Josh
"The more a man learns, the more he realizes how little he knows."

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2strokd
Posts: 842
Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Wed Aug 15, 2012 12:12 pm

Get, get, GeTiN IT!! :lol: Thanks Josh!


Here is a short clip i just shot. Of course, right before i ride it my SD card maxed. So no ride vid.... Yet 8) .

http://www.youtube.com/watch?v=2LVDf9GIA0A


It feels stouter yet. Allot crispier at lower RPM. I really wish i had a better way to monitor temps! By the time head/spark plug temps rise it could already be too late. Or i would push it as lean as possible..
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver

zombie
Posts: 1303
Joined: Thu Oct 08, 2009 11:30 pm
Location: N.W. Florida

Postby zombie » Wed Aug 15, 2012 8:14 pm

I bought my EGT set up on Ebay. 19.00 for the sender (k type), and 9.00 for the gauge. I did end up getting an 80.oo gauge but for the initial 35.00 including shipping it has saved my engine from melting another dome.
http://www.ebay.com/itm/Universal-2-Car ... b2&vxp=mtr

http://www.ebay.com/itm/Digital-DC-Temp ... 3a67630a68

This is the gauge I have now.
http://thesensorconnection.com/gauges-p ... emperature

I have the old gauge if you are interested. I ordered two. One is unused NIB You just need a 9.00 sender.

I also noticed the yellow on your electrode. That is super heated ash from your oil. I'd go down one step on the heat range. As you get leaner the electrode will get hotter causing fast wear, and failure. If you are running 8 series plugs go to a 9. If you use BR8HSA you will have to order BR9HSA over seas. They are not sold in the US.
A needle kit can help ALOT in dialing in the balance between main, and pilot too. I've had issues getting a good balance. A ten pack of needles will cure almost all balance problems.
Addicted to 2 stroke 50cc:

I don't use the choke. I warm my fuel in a spoon, and inject it into the vacuum line.

User avatar
2strokd
Posts: 842
Joined: Wed Oct 28, 2009 8:08 am
Location: Lafayette IN

Postby 2strokd » Mon Sep 17, 2012 9:08 pm

Sorry for the delayed response and thank you for the offer Zombie. Im strapped right now :? . Can barely afford to race it, let alone by much anything else for it right lately. Life has its ups and downs.

On a brighter note. My new ignition is working great! Still needs jetted and "fine tuned". I think i may raise my final drive ratio a bit as well.?. 10:15 is a tad tall for the 1/8th on this scoot. I could run 1/4 mile with these gears im sure.

On an even brighter note. My son got a chance at a short blast on Skeedr today :D

http://www.youtube.com/watch?v=y9XVj-rMDI4
The CVT is seriously underestimated by some!

01 CPI Misketo MZ49cc to70 to103cc-Drag scooter

03 Kymco Cobra (SF10)49cc- Daily driver


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