1971 Sprint
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Veni, Vidi, Posti
a not so normal vbb2 '64, a weirdo vbx '86, a not so normal pts100 '82 and a red lipstick '74 sprint
Joined: 15 Jun 2009
Posts: 5706
Location: Indo
Sat Aug 22, 2020 8:50 pm quote
chandlerman wrote:
I like the bench/long seat, personally. Too much looking at bodges with the saddle seats on them, maybe.
+1 the long seat
Ossessionato
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 2799
Location: Chicago. Well, Evanston, but that's almost Chicago
Mon Aug 24, 2020 12:30 pm quote
What a Sprint really needs is a nice sport seat. Just sayin'

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Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Mon Aug 24, 2020 2:45 pm quote
Got the road 2 exhaust installed today, also had to reinstall the gear selector because it wasnít engaging.
In the process of putting the carburetor in, I got a stuck choke mechanism, the choke cable feeds into the tube just fine, but choke knob is difficult to push in or pull out. I used a drill bit to clean out the tube and itís working now. Sort of...
Hoping to get the gas tank in tomorrow.

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Ossessionato
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 2799
Location: Chicago. Well, Evanston, but that's almost Chicago
Mon Aug 24, 2020 5:04 pm quote
You think you're going to be rolling in time for Slaughterhouse? You still have almost two weeks!
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Tue Aug 25, 2020 10:24 am quote
Oil sight glass problem.
Not looking good for having my sprint ready for Slaughterhouse Chandler.
I tried to install the fuel tank this morning and noticed the oil tank sight glass was not lining with the hole in the frame. I tried everything I could think of but it wasnít even close. I partially separated the fuel and oil tank and tried again and it went right in. I had to slide the oil tank down approximately 1/2 inch.
Which is a problem, I donít think that set up is made to be adjusted. Do I have the wrong fuel tank?
I tried adding a 1/4 inch washer to the inside of the oil tank but the nut that holds the oil tank on wonít thread on. The tank that came with the sprint was a one piece fuel/oil tank. The previous owner had welded the opening for the oil sight glass shut. Thought he had disconnected the lubrication system but he was using an oil dipstick to keep an eye on his oil level.

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It fits this way

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Doesnít fit this way

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Original? Tank with sight glass hole welded shut

Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Tue Aug 25, 2020 10:36 am quote
Hold on... maybe Iím going about this the wrong way, maybe it is adjustable? If I install the nut inside of the oil tank only, and then install onto the fuel tank, it can be adjusted.
I was installing the nut from inside the tube in the fuel tank.
Iíll try that.
Member
Old Vespas and Lambrettas
Joined: 11 Feb 2019
Posts: 45
Location: Arizona
Sun Aug 30, 2020 5:13 pm quote
Outstanding thread. Sorry I came to the show late. Sprints rule.
Addicted
bare metal cafe racer
Joined: 01 Sep 2017
Posts: 1000
Location: Aotearoa (New Zealand)
Sun Aug 30, 2020 5:52 pm quote
Getting the autolube tank in is tricky even if the hole is in the right spot. You have to have the angle of attack just right - pushing the front down first, but not too much. I have to slowly see-saw it down into place. My sight-glass just slips under the top of the hole (knocking the rubber out most of the time which is a pain to re-seat). But once the tank is fully in there is plenty of clearance and the glass is pretty much centred. I use a piece of fishing nylon to guide the fuel tap through - if you don't tie it only loop it then once it's in place you can just pull one end so it comes free.

I made a template for the hole for a VBB - dunno if it corresponds with a Sprint frame but maybe?

Here is it: http://modernvespa.com/forum/topic170874?highlight=autolube+template
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Mon Aug 31, 2020 11:38 am quote
Took my first ride today! The Sprint isles and runs well, shifts easily. So Iím pretty happy today.
Still need to:
Install the fuel tap rod
Get the headlight to work
Get over to the DMV for plates
Thereís also a metallic rubbing sound coming from the rear wheel. I think itís the the rear rim rubbing on the brake plate. Will have to look into that.

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Molto Verboso
Vespa
Joined: 19 Jun 2007
Posts: 1168
Location: California
Mon Aug 31, 2020 11:48 am quote
Right On looks great!
Addicted
bare metal cafe racer
Joined: 01 Sep 2017
Posts: 1000
Location: Aotearoa (New Zealand)
Mon Aug 31, 2020 1:10 pm quote
Looking awesome! Grats on getting it riding. So howíd you sort the tank in the end?
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Mon Aug 31, 2020 3:09 pm quote
I used a rubber plug, a degreaser, water and some glass beads I found in the garage. Then I rinsed it out and used a heat gun on low setting to expedite the drying process.

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Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Mon Aug 31, 2020 3:23 pm quote
I noticed a couple of things I need to adjust on this Sprint.
First off the scooter stopped running 3 blocks from home. I pushed for a while then I opened the gas cap and after that it started right up. When I got home I cleaned up the vent holes in the cap.
But I also noticed that my brand new spark plug is black and fouled. Itís a b7hs, I put a b6hs in and itís a little better.
I did change out the exhaust on this scooter, it has an SIP road II.
The jets are
Main 96, be3-160
Starter 60
Idle 50
Do I need to change the jets?
The scooter pulls fine, seems to have plenty of power for a 150 cc.

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Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Wed Sep 09, 2020 1:46 pm quote
I think autolube is working
The old sprint came with an oil dipstick. Probably because the PO welded the sight glass hole on the original oil tank. After I got the scooter running, I started with 1/2 gallon of 2% premix. I kept an eye on the clear autolube line at the carb waiting for the red 2T oil to reach the carb. In the meantime I took a few rides, (discovered that I had clogged vents in my gas cap) and added another 1/2 gallon of premix, by this time the 2T had definitely reached the carburetor. But just to be on the safe side I started checking the 2T oil with that handy dipstick.
Sure enough, the level has dropped just a bit. So I think the autolube is working.
I got around to installing the fuel tap lever and various rubber bits today. The scooter runs strong, but I plan to do a plug chop and try some different carb jets after I work up the courage to fill the gas tank up with pure gas.

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Dipstick

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Ossessionato
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 2799
Location: Chicago. Well, Evanston, but that's almost Chicago
Wed Sep 09, 2020 2:01 pm quote
you can also check the autolube by pulling the oil hose off the airbox and seeing if it pushed oil out while the scooter is running. If you already have premix in the tank, that's an easy way to test it.

Scoot's looking amazing!
bodgemaster
1963 GL, 1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 5431
Location: So Cal
Wed Sep 09, 2020 2:31 pm quote
Nice project vp... you got that Sprint spruced up in record time. Enjoy! And donít forget the cotter pin.
Addicted
1986 T5, 1971 Sprint
Joined: 30 Oct 2014
Posts: 570
Location: Oak Brook, Illinois
Wed Sep 16, 2020 3:10 pm quote
Jetting
Today I rechecked the timing on the sprint with a gun and it was off. I have it timed now at 22 degrees btdc. I swapped out the main jet to 109, (it was all I had lying around), put in a new plug and went for fast ride. The scooter idles fine, but bogs a bit starting out and continues to struggle until I hit 3500-4000 rpms, (Iím guessing on the rpms) then the motor smooths out and accelerates nicely in that range. The plug looks a little blackish.
Right now the jetting
Main = 109
Atomizer Be3
Air = 160
Slow running = 50
Not sure about the starter jet
Iíve ordered some new main jets, 102, 104, idle 55/160, and an air jet, 160
Also, there is an air bubble in my oil line, the oil line I have in it now is incorrect, the inner diameter is too large. I have new oil line coming, but for now Iím still not sure the auto lube is working correctly. So Iím still premixing my fuel and quite possibly running what in essence would be a 4% mix. That may be affecting the plug.

.

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Bubble in oil line

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