Originally Posted by onehundred80
My estimate is that this is out by about .125" -.150"
Measure the error as my drawing shows in post #57, I only suggest this as it has been mentioned before that they can be repaired by making them the same overall length as the stock pulley, this is wrong.
The breakage of the Allen screws indicates to me that these are low quality screws, these are often used as they are cheaper to buy than brand name screws such as Allen and Unbrako, they are just cheap s**t. Made in Asia mostly the material is suspect and the screws do not conform to US standards. Sometimes the threads are cut rather than rolled, this gives even weaker parts.
This is the first pictures that I have seen that indicate the two piece construction, are the two pieces held by any keys or dowels to each other, or are the screws the only method to stop them rotating slightly against one another?
With the two piece construction the ribbed section is the same for all setups and the spindle part is matched to different engines, saves money and simplifies stocking.
Hopefully the correct parts are given to an worker who assembles the parts , with no inspection later this can lead to problems. We are assuming that all parts are correct in the first place.
The two-piece design is only held together by the screws, at least that's how my 181mm pulley was.
onehundred80 - regarding the two piece design, LET posted the following on MBWorld.org explaining the design:
"I would like to clarify a few things with the new design of the pulley. This new pulley has a mechanical dampener. It uses a friction plate / clutch material to dampen. It contains about 28 internal pieces, including 8 springs.
The new design is a true work of art.
...
Personally, I prefer this new design. The mechanical dampener works throughout the entire RPM band."
So, according to LET there're 28 individual components contained within that aluminum outer pulley, providing the critical dampening functionality of our engine's crank pulley (the OE pulley is also dampened, by an elastomer ring IIRC)... the center ring of the LET pulley (that mounts to the crank snout) is a solid piece of metal I believe.
Waldig (aka Woody) - the LET idler is essentially a replica of the ASP idler; they're both 60mm. AFAIK, they use(d?) the same idler for both the 181 and 185 pulley kits.