1964 Vespa 90

I just bought this Vespa at a scooter show and it had a locked up engine. If you kick the starter over it just goes to the bottom and does not try to stop since the engine is locked up, any thoughts. Also I unfroze the clutch and handlebar shifter and put it in gear and spun the back tire but still spun

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Re: 1964 Vespa 90

Kind of confused by your last sentence, if you put it in gear and spun the rear tire with it in gear the engine isn't locked up? If it was locked and in gear the rear tire would not move

Re: 1964 Vespa 90

I can’t even spin the flywheel.

Re: 1964 Vespa 90

marvel mystery oil down the plug hole and let it sit 24 hours then try turning it over bit by bit back and forth by hand.

Re: 1964 Vespa 90

Turn the flywheel? Will pb blaster work

Re: 1964 Vespa 90

yes turn the flywheel by hand. pb blaster might work i've always liked marvel mystery oil for frozen rings.

Re: 1964 Vespa 90

50/50 automatic trans fluid and acetone.

Re: 1964 Vespa 90

Instead of marvel

Re: 1964 Vespa 90

all that stuff works good to loosen up rusted tight rings but I think AeroKroil might be the best. Soak it like all have said, then rock it back and forth in gear. This may take many days but usually you can free them up

Re: 1964 Vespa 90

The wheel doesn’t lock up when in gear but the engine is locked up

Re: 1964 Vespa 90

put it in netral and try turning the fly wheel with the plug out,soak in one of the above for a few days to a week,i used pb blaster and acetone tranny fluid last week on a stuck motor, back and forth and don't force it,parts are expensive and sometimes not replaceable.

Re: 1964 Vespa 90

More then likely your have to drop the engine out so you might as well do it now, you still want to spray the cylinder and try to brake it lose. You can get parts but they are on the pricey side. Try scooter west for parts.

Re: 1964 Vespa 90

Yup, ur gonna be to pull the engine. Nice bike tho, imma guess that's what's refered to as a small frame Vespa?

+++ Kroil is the best, bar none.

Also-holy shit my 1000th post. Can't believe that I've been hanging here for over a decade.(edited)

Re: 1964 Vespa 90

Blaine- The artist formerly known as Plumber Crack "(OFMC)" /

Sounds like the clutch cable is sticky and holding the clutch open also, hence the free to spin wheel and wiffty kicker.

Re: 1964 Vespa 90

I started taking the engine off last night

Re: 1964 Vespa 90

try scoot.net, it’s a good resource for vintage Vespa, or modernvespa’s classic/vintage section. Small frames are super cool and have a ton of tuning potential

Re: 1964 Vespa 90

utube had one on a old vespa,get a manual if you can it will be worth the money. scooter mercato is a good place to get parts. This is a moped site,hence the name moped army.

Re: 1964 Vespa 90

I finally got the stinkin motor off.

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Re: 1964 Vespa 90

The gas tank is really clean surprisingly

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Re: 1964 Vespa 90

Other then lots of cleaning the engine looks ok so far.

Re: 1964 Vespa 90

I am impatient (proof) anyway to fix that nut that broke off with part of the screw

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Re: 1964 Vespa 90

I also took the head off and see corrosion all around the piston. I am soaking it in pb blaster, is there anything else I should do with it

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Re: 1964 Vespa 90

Ive seen worse. soak the piston and try to tap it out with the handle of a hammer. you will need to put heat to any of the nuts/bolts.

Re: 1964 Vespa 90

Tap the piston down? And what do you mean by putting heat to the bolts

Re: 1964 Vespa 90

Should I take the cylinder off

Re: 1964 Vespa 90

Yes take it off, take it all off. sorry yes take the cylinder off. A cheap propane torch works great to heat nuts up and spray some WD40 on them.

Re: 1964 Vespa 90

Okay

Re: 1964 Vespa 90

Dirty30 Dillon /

You need to rebuild that entire bottom end. And probably just easiest to replace the topend

Also:

SIP Scooter Shop and Racing Planet USA are great sources for scooter stuff

Re: 1964 Vespa 90

I unbolted the nuts off the cylinder and started hitting the piston down with a rubber mallet handle and hammer (it’s not working)

Re: 1964 Vespa 90

put LOTS of spray on the top and bottom of the piston and let it soak for a few hours.

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