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Kimjon's 50cc (then later ... 150cc and 400cc...then 1000cc) of awesomeness!


Kimjon

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  • 4 months later...
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Picked this up. Its actually better than it looks, although several items including the headlight have fallen off it in my short period of ownership.

It was rattling and shaking like a bastatd!! So I went through it tightening up the obvious stuff. It's now 90% better...though I think there's a small bag of marbles loose inside the frame.

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Now - why would I purchase this, other than for its good looks, you may ask? Well, it sports a pretty wild engine. It started life as a 1977 PX125 Vespa, but now has a 177cc polini kit and port work - making this a very impressive little motor. Pulls hard and is noticeably faster than my other vespas. I think stock the little px125 is about 6hp? These polini kits are getting North of 15hp and it feels it too.

So suffice to say, I'm in love with this little beastie.

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  • 1 month later...

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Motor going in. Fingers crossed at this stage.

Then I set it down...gave it one kick and it fired up straight away into life on the first kick...fuck yeah!!

I've put about 100km on it so far. It's got a lot more power than beforehand. I port matched the top end/intakes. Put Boyesen reeds in it and that's about it. Possibly tighter squish, though I never bothered measuring it? But whatever I did, it's working well.

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  • 2 weeks later...

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Ready for sandblasting now.

All rust removed, excess holes for 63 years of add on and fuckery all filled with metal. A fair amount of pannel beating done, front end was bent out of shape from previous "friendly nudges" its endured over the years.

I re-upholstered the seat, and strengthened some know weak areas in the frame.

Can't wait to get this to a sandblasted.

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  • 1 month later...

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I managed to find the period correct guards, so pretty stoked about that.

It's now with my sandblaster...so hopefully I'll get it back in a few weeks time, blasted back to bare metal and primed.

The body is really good on this one and I've been over it with a hammer and dolly, so will only require a minimal amount of body work once I get it back.

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  • 3 weeks later...
  • 4 weeks later...

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Only the train spotters will notice, but the PX series has a plastic foot mat on the tunnel. I've always had a hard-on for the early wide frames, which have a couple (aluminum with rubber) channels like the floor board has, but on the tunnel as well (no ugly mat). So I've kinda copied the early models, where I reckon they got it right all those years ago.

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  • 2 months later...

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Milled cylinder down to get squish from an unreasonable amount (couldn't even measure it, as it was so large).

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Finished product.

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Ported the cylinder too...be rude not to while it was apart.

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All done with motor left on bike

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Bit smaller than I was hoping for (1.2mm was the goal)...but full send.

Took it for a 70km trip. Performed flawlessly. Fuck yes!! Power is awesome thanks to  new sito exhaust, porting, carb jets etc 

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  • 2 weeks later...

V2.0

3mm base spacer, 3.5mm milled off top of cylinder.

Exhaust raised by about 3mm (6mm total if you add spacer height). Gives something like 130/180/30 timings. The blowdown of 30 was bigger than intended.

Revs hard, like I'm scared of it turning into a grenade!! Pulls hard in 1st, 2nd, 3rd...but 4th gear sucks with 23T clutch sprocket as its a big jump and lands right in a flat spot in the power range.

So after all that, yip...I put the other more mildly ported cylinder back on. Torque wins. The v2.0 probably made more power, but it had to rev high to get it and it just felt like I was thrashing it every gear. The v1.0 with more torque doesn't work as hard and goes faster being able to actually pull 4th gear.

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