Early CL77 exhaust length question

[Frank in Wyoming]

This is my first question since joining, and I did use the Search function. Regarding the early Scramblers without the factory exhaust “can”. A. how much longer is the lower pipe than the upper pipe at the end of the tips? B. As a reference, drawing a straight line from the upper shock bolt to the lower shock bolt, what are the exhaust pipe lengths of the upper and the lower pipes, measured from that reference line? Sorry to be so long winded! Frank in Wyoming

[DJM]

I will check my bike for you but I'm not 100% certain that it is correct and unmodified after fifty plus years.

Strictly, I think you should research this under CL72 as I'm pretty sure that ALL CL77s were supplied with a muffler from new, the slip on version originally and them the welded on version, presumably because Honda weren't happy with people taking them off!

I have a number of period pictures of original bikes which should give you a good guide as to the 'correct' length.

[Frank in Wyoming]

Thank you DJM!

[G3]

Frank,

Without using sophisticated equipment, and understanding my 66 CL77 was purchased “as is” in 2008, without the guppy muffler, here are my (rough) exhaust dimensions;

From the approximate center line of the rear shock, to the end of the top pipe is 2-3/4”
From the approximate center line of the rear shock to the end of bottom pipe is 8-1/4”
The difference in length between the top and bottom is approximately 5-1/4”

The center line of the shock is eyeballed, so each measurement is close but not down to the exactness, but I can tell my OEM muffler was hacked off.

You can compare numbers with DJM and come up with your own spec.

In the end, I hope this helps.

[Frank in Wyoming]

Thank you G3,appreciate your help! Also, I like the name “guppy muffler”!

[G3]

Yer welcome Frank.

[Frank in Wyoming]

G3, I see that you are in SoCal. I lived in Tustin from 1963-66. Too young for a drivers license, but was not too far from Saddleback Park motorcycle park. In the summer at night I would listen to the 305 scramblers go through the gears off in the distance, and thinking some day I would own one. Fast forward 52 years, and finally I got one.