150D update

jbcollier · Post by **jbcollier** » Sun Dec 13, 2009 5:02 pm

My head's been buried in a blasting cabinet and I only just now came out for air. I can't remember what I told you last time so please first accept my apologies for any duplication.

The top end (cylinder, piston and head) are being worked on as we speak. Gullermo at Lambretta Works is doing the XP porting mods. I have been struggling a bit on which carb to use. Newer carbs just wouldn't look right -- but sure as heck would work better! I have settled on a period Dellorto UB22BS with a vertical float bowl. It will look like this:

http://rides.webshots.com/photo/2533846 ... 5367EVaqzo

Yup, mounted sideways! I will have a filter on it. I know, the open bell mouth is impossibly cool but it's too darn dusty around here and there is only 1 oversize piston available for the D/LD engines. However if you all want to chip into my my annual piston and liner fund, I'll go open bell mouth :-) I know I'll just love jetting from scratch with a vintage carb that only takes expensive hard to find jets and needles!

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Please insert here: What the *#£*!! is he thinking!

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I am also modifying the fork to accept the (much) later front shocks. They'll be modified to look period including a custom lower side mount attachment to the fork links. It will look like this:

http://rides.webshots.com/photo/2765814 ... 5367jEJxoQ

Minus the "wings of Mercury" embellisher.

There must be twenty or so parts that are painted which is why I have been stuck in the blasting cabinet for the past week. Many of them also require reworking as the PO didn't always follow best practice! All to explain why it's not at the painters yet. I'll be dropping off some panels before I go (at least I hope so!).

The rear fender is just one example. The one on the scoot had been POed to death so I scrounged a used one off Casa and ordered a repair section from Italy. The repair section was just the right length to make the used fender perfect BUT it was made too narrow!. I had to slice it and weld/braze in extra material so it would line up correctly Oi! There aren't many panels on a D but they all are need of this kind of love and attention.

Once my work on all the paintables is done, I'll start on the engine assembly.

And when the scoot is done, my next hobby is going to be knitting!

jbcollier · Post by **jbcollier** » Wed Dec 16, 2009 2:16 pm

Dropped off my first load of 150D parts at the painters today. Whew! No more blasting for a while, please.

Just waiting on the front shock mounts and a torsion bar arm and then I can finish off the fork and the frame and drop those off as well.

Angelo · Post by **Angelo** » Wed Dec 16, 2009 2:50 pm

It's a good thing this is your project. My turn around time for projects is in the 3-4 year time frame I will be surprised if your project isn't on the road by spring 2010, Plus your version will look amazing. I love the mods and decisions you have made with your project. The carb will look incredible.....good work John. Nice to see that the Lambretta desease working it's way into your brain stem and hampering your better judgement...

jbcollier · Post by **jbcollier** » Wed Dec 16, 2009 3:37 pm

Now we just have to get you hooked on "real" Lambrettas ;-)

jbcollier · Post by **jbcollier** » Wed Dec 16, 2009 4:48 pm

Spring 2010 might be a bit tight. Definitely done by spring 2011!

jbcollier · Post by **jbcollier** » Wed Dec 23, 2009 8:31 pm

Vespa Motorsports has a special on P200 Sito exhausts so I ordered one for the 150D. It won't be a bolt-on (ha ha) but it will look vaguely period when modified and mounted which a modern expansion chamber wouldn't.

I think I can say that all the major bits and bobs are somewhat sorted now. Not here, not completed and no where near half way home but the beginning is fading from view and the albeit distant end should soon appear on the horizon.

Uh oh, what appalling prose. I have to remember to write first and drink second!

Cheers

jbcollier · Post by **jbcollier** » Tue Feb 02, 2010 9:24 pm

All sorts of shiny bits for the carb arrived today. The alloy bell mouth is gorgeous! Heaven help me if Janet ever finds out how much this little bag of unobtanium cost!

Angelo · Post by **Angelo** » Tue Feb 02, 2010 9:42 pm

jbcollier wrote:All sorts of shiny bits for the carb arrived today. The alloy bell mouth is gorgeous! Heaven help me if Janet ever finds out how much this little bag of unobtanium cost!

It cost $40.00, you got it on a clear out deal....

I order the SprintV exhaust today so the Sito will be available!

jbcollier · Post by **jbcollier** » Mon Feb 15, 2010 9:51 am

Progress continues. The carb has been a steady series of hiccups which I (hopefully) may have finally come to the end of. I also scrubbed and painted the engine cases and covers (they're supposed to be).

Lastly, I have completely finished with the repairs on the frame. There is no doubt it was a farm bike and got thoroughly trashed, jumped and the good lord only knows what else. Thankfully the frame is straight. I fabbed up missing tail piece and steering lock bracket, repaired cracked brackets and made the center stand whole again!

Now I just have to wait on my West Coast Lambretta order so I can do the mods for fitting front shocks. Then the painter will have all the parts he needs and I'll finally have to stop dithering over the paint colour!

If works is slow, I'll start on engine assembly this week.

Meanwhile I have stripped down the BMW, sent away the driveshaft for extensive mods, replaced the clutch, rear engine seal, paralever bearings and am just waiting on some shims to finish off transmission.

Busy winter! Empty bank account!!

jbcollier · Post by **jbcollier** » Mon Feb 15, 2010 10:01 am

Now the carb is truly finished, thank goodness.

I had a UB22S carb which revealed a cracked mounting flange when cleaned up. So I cruised "the auction site that dare not say its name" and found another UB22 carb. Unbeknownst to me, the UB carbs are available in two stroke (S) and four stroke (BS). Yup, the second carb was a BS.

Despair gave way to curiosity so I set about seeing if I could convert the BS to S specs. Thankfully we have a lathe at work. I first opened up the needle jet bore and pressed in the venturi brass fitting from the S. Next I drilled out the air bleed passage and machined the venturi inlet to match the S again. Finally I machined down the toast S carb to provide a threaded sleeve for the needle jet to screw into. Pressed it home and, voila, no more BS!

(You just knew there had to be a bad pun coming)

Angelo · Post by **Angelo** » Mon Feb 15, 2010 11:47 am

jbcollier wrote:Now the carb is truly finished, thank goodness.

I had a UB22S carb which revealed a cracked mounting flange when cleaned up. So I cruised "the auction site that dare not say its name" and found another UB22 carb. Unbeknownst to me, the UB carbs are available in two stroke (S) and four stroke (BS). Yup, the second carb was a BS.

Despair gave way to curiosity so I set about seeing if I could convert the BS to S specs. Thankfully we have a lathe at work. I first opened up the needle jet bore and pressed in the venturi brass fitting from the S. Next I drilled out the air bleed passage and machined the venturi inlet to match the S again. Finally I machined down the toast S carb to provide a threaded sleeve for the needle jet to screw into. Pressed it home and, voila, no more BS!

(You just knew there had to be a bad pun coming)

I love how you share your mastery of mechanics and machining. I'm in awe...

coyoteran · Post by **coyoteran** » Tue Feb 16, 2010 5:12 am

Angelo you may be in awe but personally, I am insanely jealous. I wish I had half the skill and one tenth the tool shelf. John tears apart and rebuilds things with as much apprehension as I would have frying an egg. And no doubt finds it easier.

Nice work John.

T

jbcollier · Post by **jbcollier** » Tue Feb 16, 2010 6:28 am

Confession time: I don't know how to fry an egg.

jbcollier · Post by **jbcollier** » Tue Feb 23, 2010 6:40 am

I went to set up the crank drive bevels and metal chipped off the much abused kickstart mech had run through the gears. This makes it impossible to set the gears properly as you have to have play in the tightest spot which means it is too loose everywhere else: too loose = noisy.

Thankfully Cambridge Lambretta have new gearsets in stock. Now I just have to sell my first born to fund it!

Angelo · Post by **Angelo** » Tue Feb 23, 2010 3:12 pm

jbcollier wrote:I went to set up the crank drive bevels and metal chipped off the much abused kickstart mech had run through the gears. This makes it impossible to set the gears properly as you have to have play in the tightest spot which means it is too loose everywhere else: too loose = noisy.

Thankfully Cambridge Lambretta have new gearsets in stock. Now I just have to sell my first born to fund it!

Damn!