Modern Vespa : need your advise (PX150 gearing for HWY)

need your advise (PX150 gearing for HWY)

OP scooterist UTC details Molto Verboso 71' Sprint Veloce , 05' Vespa PX150, 1978 P200E Joined: UTC Posts: 1614 Location: Tucson, AZ
OP scooterist Molto Verboso 71' Sprint Veloce , 05' Vespa PX150, 1978 P200E Joined: UTC Posts: 1614 Location: Tucson, AZ	UTC quote Here is an update. The idiosyncrasy of the vespa gearing PX150 with a Malossi 210cc installed but now other issues

whodatschrome

UTC

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parallelogramerist

Joined: UTC
Posts: 5555

whodatschrome

parallelogramerist

Joined: UTC
Posts: 5555

UTC quote

scooterist wrote:

Thanks for all the support folks. I am currently installing(swapping) a full P200E engine that I had on my sprint veloce. This engine has a new pair of engine cases, a new malossi 210 and it has the taller gears.

My question is now regarding the autolube. Would the autolube on the PX150 bolt and work on the P200 engine? I think the worm gears are slightly different.

The P200 engine that I am using that the oil passages blocked because I was mixing it myself.

The PX150 auto lube will bolt right on to the P200. The 150 oil pump gear is slightly different from the 200. The 200 flows a little bit more oil. Most people mix a 3% ratio on kitted largeframes, so most people end up premixing instead of using the auto lube.

OP scooterist UTC details Molto Verboso 71' Sprint Veloce , 05' Vespa PX150, 1978 P200E Joined: UTC Posts: 1614 Location: Tucson, AZ
OP scooterist Molto Verboso 71' Sprint Veloce , 05' Vespa PX150, 1978 P200E Joined: UTC Posts: 1614 Location: Tucson, AZ	UTC quote ^^ thank you too much. I went for a test ride this afternoon and I premixed at 2% and the engine was very hot, I mean, very hot to the touch(cowls). My middle was extremely high even though the middle screw was set for the lowest possible adjustment(low iddle). I am going to try the 3%. I really appreciate your involvement

Rusty J

UTC

details

Molto Verboso

LXS 150

Joined: UTC
Posts: 1212
Location: The OTHER South Bay, CA

Rusty J

Molto Verboso

LXS 150

Joined: UTC
Posts: 1212
Location: The OTHER South Bay, CA

UTC quote

GoSlash27 wrote:

Scooterist,
Your drag increases exponentially at the function of velocity ^4. You want to have your top speed RPM inside the torque curve at top speed. Gear it too short and you'll run out of steam before you hit top speed. Gear it too tall, and you'll never develop enough torque to reach top speed.
The clutch "input" gear is very easy to swap, and the easiest way to alter the gearing of your bike. As the others have said here (and I heartily concur with after learning the hard way) Invest in a CHT gauge, wear proper gear, and don't do highway speeds on inner tubes.

Stay safe!
-Slashy

Square of airspeed, not fourth power.
It's still exponential, but not as sharply as that...

chandlerman

UTC

details

Innovator

76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 66 Lammy S3

Joined: UTC
Posts: 11060
Location: Nashville

10 Days Since Last Explosion

chandlerman

Innovator

76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 66 Lammy S3

Joined: UTC
Posts: 11060
Location: Nashville

10 Days Since Last Explosion

UTC quote

scooterist wrote:

I am going to try the 3%. I really appreciate your involvement

Please do not do this. You are displacing gasoline with oil, meaning that you're going to lean the mixture out further, further increasing likelihood of a seize.

You should spend the $35 to get a Cylinder Head Temperature Gauge (CHT) to start, so you'll at least know what sort of temps you're running and hopefully slow down before you seize.

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