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post #1 of 34 (permalink) Old 08-07-2009, 11:06 PM Thread Starter
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Wow! New pipe

Put a new pipe on my 1979 Honda PAII tonight. It's a lot faster! I'd say i picked up 5-10mph top end and it pulls a lot more getting up to speed. It is the only non original part, but it's worth it, i'll keep the stocker around, can't wait to get the new jets I ordered so i can get it tuned so i can take it for a proper test ride.
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post #2 of 34 (permalink) Old 08-08-2009, 07:12 AM
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That's one clean looking scooter. The pedal clear that exhaust?

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post #3 of 34 (permalink) Old 08-08-2009, 07:48 AM
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Chambers make a world of difference on a 2smoke. And look cool as hell.
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post #4 of 34 (permalink) Old 08-08-2009, 08:56 AM
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whats the top speed on it???
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post #5 of 34 (permalink) Old 08-08-2009, 09:53 AM Thread Starter
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Thanks! It's a 1979 and looks and rides like new, I rebuilt the engine a couple weeks ago. The pedals clear the exhaust no problem. Stock top speed is 30 (flat road) and now its doing about 38.

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post #6 of 34 (permalink) Old 08-10-2009, 10:41 PM
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That thing is sweet. I didn't even know they made chambers for mopeds that old.
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post #7 of 34 (permalink) Old 09-12-2009, 12:13 PM Thread Starter
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Today i dumped another $2.99 into the beast. Installed stiffer clutch springs (1000rpm over) and notched the variator. Top speed is now much more comfortable since the RPM's drop once i get near top speed and the clutch springs improve off the line performance. Now all I need is that 70cc kit to really take advantage of my additional gearing. Currently it does over 40mph, shooting for 50+ after a big bore kit.

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post #8 of 34 (permalink) Old 10-17-2009, 06:17 PM
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post #9 of 34 (permalink) Old 10-17-2009, 06:28 PM
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LOL, I was thinking the same

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post #10 of 34 (permalink) Old 12-21-2009, 09:45 PM Thread Starter
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Updates:
Cleaned and sealed the gas tank, new fuel filter, lines, and good carb cleaning/soak.
Jetted the carb, will be going up again shortly.
Upgraded dual stage reeds
Modified the variator to allow taller gearing at speed
Just ordered a 70cc big bore kit and new tires/inner tubes.

Without the kit it's running 40-45mph, I expect to be in the mid 50s shortly.

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post #11 of 34 (permalink) Old 12-21-2009, 09:48 PM
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what are you doing to the variator?

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post #12 of 34 (permalink) Old 12-21-2009, 11:09 PM Thread Starter
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what are you doing to the variator?
cut notches in the walls so the weights can travel further (taller gear ratio), it made a huge difference, the weights roll up the ramps like normal but now roll over the edge and into the new gap and it basically sounds like it shifted into a taller gear, pretty cool actually, but the change over happens around 30mph and I didn't quite have enough HP to take advantage of the taller gearing, the kit should fix that problem.

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post #13 of 34 (permalink) Old 12-22-2009, 01:56 PM
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that's pretty suweet to get the moped up that fast. nice job

i was thinking of getting a sachs madass this past summer. heard there's a bunch of mods available for that too


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post #14 of 34 (permalink) Old 12-22-2009, 01:58 PM
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cut notches in the walls so the weights can travel further (taller gear ratio), it made a huge difference, the weights roll up the ramps like normal but now roll over the edge and into the new gap and it basically sounds like it shifted into a taller gear, pretty cool actually, but the change over happens around 30mph and I didn't quite have enough HP to take advantage of the taller gearing, the kit should fix that problem.
do you have pics explaining this, i could use it on the zuma and its variators

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post #15 of 34 (permalink) Old 12-23-2009, 11:13 AM Thread Starter
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do you have pics explaining this, i could use it on the zuma and its variators
I dont' have any pictures of mine, but here is one I found online. Normally the walls limit the travel of the roller weights, as you can see by notching the walls it allows the weights to move out further, the ramp plate now becomes the limiting factor, on my moped this means about a 5000rpm drop in RPM around 30mph, which allows you to increase your top speed substantially since the motor is no longer at the top of it's rev range.
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post #16 of 34 (permalink) Old 12-23-2009, 11:20 AM
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sweet thanks

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post #17 of 34 (permalink) Old 12-28-2009, 02:18 PM Thread Starter
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moped is too big for the dinning room table so i had to improvise, kitchen! Got the old bits out except for a piece of one of the cylinder studs that broke off, I need to go extract that after lunch, then i can bolt up the new stuff, you can see how much bigger the new piston is, well, i guess surface area it should be 40% bigger, NIOCE. It's a shame it's so shitty out, i'm gonna wanna ride this thing, maybe i'll just do some flat track style ice racing with it, that'd be pimp until i crashed. Oh and you should have seen me lugging this thing up the stairs (it weighs well over 100 lbs and is no where near easy to handle, teh handle bars flap around, the wheels spin, it was a real pain in the balls, plus the whole time i was worried one of my neighbors would come out and see me hauling this thing up to my unit
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post #18 of 34 (permalink) Old 12-28-2009, 03:52 PM Thread Starter
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Removed the broken stud and installed the big bore kit, everything got a nice coating of two stroke oil and is sealed up tight, compression is very good, much better than before, the original piston rings must have been pretty much done for. I also upped the jet while the frame was off. Stock was .78mm (diameter), I put in a .92mm, which is a 39% increase in surface area and fuel. I have a few other jets around that size as well so i'll do a few plug chops once I can ride it and do any fine tuning then, but this should be pretty close. All that's left is to check and adjust the clutch, put the frame back on and wait for the snow to melt :-)
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post #19 of 34 (permalink) Old 12-28-2009, 04:06 PM
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carbon fiber reeds?

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post #20 of 34 (permalink) Old 12-28-2009, 04:10 PM Thread Starter
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carbon fiber reeds?
no, fiberglass dual stage for now, they were great before the kit, but i might need to go with slightly stiffer reeds now, just have to wait and see.

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post #21 of 34 (permalink) Old 12-28-2009, 04:55 PM Thread Starter
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all done, looks like the same old moped..... but it's not
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post #22 of 34 (permalink) Old 12-29-2009, 02:05 PM Thread Starter
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BUAHAHHAHA

I just took it out for a test, thing is downright deadly on the icy subdivision streets but once i got to a dry road and opened it up it immediately went into a wheelie and took off lol, it's a beast, can't wait for some warmer weather, i just did one shot up and down the street before my face went numb

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post #23 of 34 (permalink) Old 12-29-2009, 03:02 PM
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That piston is a monster.

Very cool project! Viva la 2t!

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post #24 of 34 (permalink) Old 12-31-2009, 03:29 PM Thread Starter
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BUHAHAHAHHAHAHA this will never get old... I just went for a ride through town and got stuck behind a car doing the speed limit (30mph) so i passed them hahahahhahaha, getting passed by a vehicle with pedals has got to be an insult. It was hilarious, also this thing is a wheelie machine

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post #25 of 34 (permalink) Old 01-06-2010, 10:46 AM Thread Starter
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Ok, first test with the GPS went well, got a max speed of 45mph. This is running a richer break in mixture and 25:1 oil mix. I plan on leaning it out after break in and using more of a 30:1 ratio on the oil which should yeild slightly better engine performance. Also the variator was not completely variating, i think I bent one of the clips that hold the weights in place, so i will make that adjustment and test again, The last missing piece is the 9mm carb, I think I'm going to bore it out to 13mm or maybe even replace the whole thing, we'll see, but reguardless i'm more confident than ever that I will be able to 50mph by spring!
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post #26 of 34 (permalink) Old 01-06-2010, 11:37 AM
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. It was hilarious, also this thing is a wheelie machine
time for an extended swingarm?

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post #27 of 34 (permalink) Old 01-20-2010, 07:42 PM Thread Starter
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Put a little something together explaining the variator and the modifications that can be done.

http://skutr.net/bikes/pa50/honda-pa...tor-explained/

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post #28 of 34 (permalink) Old 01-20-2010, 08:13 PM
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bad ass.

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post #29 of 34 (permalink) Old 02-18-2010, 04:17 PM Thread Starter
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49.2mph, after i lean it out a little I'm pretty sure i'll hit 50 (it's running super rich for break in right now).
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post #30 of 34 (permalink) Old 02-18-2010, 04:34 PM
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You must look like a complete homo on that bright yellow pedal bike. We need to get you a rainbow sticker!.

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