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The information is available online by searching the parts breakdowns, just have to know part numbers and what to look for.

Numbers are a standard length shaft, non lighted, its is for slanted app with angled intake/bowl carb recreational

sold

They were Made by Stellar that is the "Mark I" without the lights.

NOS Tecumseh Lighted flywheel 1971-1980 HS50 (square shroud HS40 as well '74-80) 33660. New in the box never mounted or installed, All magnets have equal strong pull. There is one chip on a fin (see pics), Its small enough that its not an issue but there fins on these are in fact replaceable...

That is actually a "Taco" mini bike. Its very cool, just start by cleaning, cleaning, cleaning, as It looks very complete and solid where you may not have to source too much which will probably be a little more difficult due to location.

Once you get that Driver assembly off the seal on the crankshaft/sidecover WILL have to be removed first before engine Disassembly can happen. There will be a retaining snap ring that fixes the crankshaft to the bearing that is retained on the sidecover internally before you can safely pull the...

heres a link to a thread with a good pretty much OG example of your particular model which was the HS40 version (tank mounted on engine), not the Remote tank H50 one: Street legal Roper I am just getting ready to paint the "Example" engine Tecumseh built for the first 4hp bike off the Roper...

They didn't revise the serial numbering system to have the plant/shift code (the letter at the end) until December of 1970 according to Tecumseh literature, so you can rule that out. It's most likely 1980 due to color, Model number cross referencing can verify the decade though.

Its kind of like the cardboard fuzz that you find covering old NOS shortblocks and engines when you unbox them, just like any old part, needs a little cleaning, Figure this version rug is 25-35ish years old range. :) Oh yea, I finally found a mate the Mug you got a couple years back :p...

Tecumseh never made a dual bearing engine in these sizes, current sidecover is bushing, but that can be changed to bearing and you get single bearing. It an HS50 so it uses the HS50 only crankshafts which had many different PTO configurations available,

This block/parts have been SOLD!!!

in addition to what mountainmini just posted, there is a long extended strut for the brake cable that hangs off the bottom of the arm for most of them due to where the lever was located on the early fairbanks brake assemblies. They also used different axle adjusters that were pieces of tubing...

Indeed they did, Clintons too. I don't think Tecumseh was the standard engine until sometime in 1967 which is when you can see the change in literature. Early '67 adds/photos still show the bike like is listed *which those photos would have been taken in '66, and Lit/adds by Christmas of that...

actually, That style bike would have had that badge, perfect example is the Dan blocker Bike in Rod and custom sept '66, compare things such as the earlier brake and swingarm configuration, That early style fender, etc... I would say its in the late '65-earlier 66 timeframe. Engine, shocks, and...

Last batch of shop class 475 series Briggs I got were that way, think out of 5 I actually could only get like 2 complete running engines out of the batch!

bummer, you mentioned Rupp and though maybe you had some earlier versions in your books!!! I have the ones you have now and some from around 1990 in my later parts books. Not sure what I have on microfiche, still need to find a machine on the cheap!

You have advanced parts list pink sheets from the late 60's-early 70's?? Or just the standard ones from the parts manual 80/81 and later 1980's/early 90s where parts were being changed and new sections and new books would be added?

Effenel never offered a bike with that frame, Scat Cat however did. And since its a total clusterfuck of modifications all over it, It would be really hard to narrow down actual model or year of it, nor worth bothering to even try. So the first reply given within an hour or so of him posting...