why yamiya states LR's are racing only, i suspect they feel will limit their risk for liability because the baffles would be removed for "racing" on a closed circuit track.
it is noteworthy, at the beginning of 2006, NO ONE but Honda was producing new oem exhaust (incorrect HM300's) for the sandcast CB750 until Yamiya made available the first LR's in September, 2006.
Equally noteworthy, Yamiya did NOT produce "No.no's" exhaust until at least one year AFTER their LR's were made available. Perhaps Yamiya's not putting the "racing disclaimer" on their "No.no's" is an oversight.....?
the reason Yamiya made a legal disclaimer is for the fact the tip of the 6 mm hex screw which holds the baffle in the muffler is not welded to the inside of the muffler, as per factory original. Yamiya's saying the LR is for racing only is an attempt to limit their liability in the event someone used a LR on a public highway, the screw came loose and the baffle fell out on the highway and caused damage or injury to another vehicle and/or operator of the vehicle.
i know this because at the time Yamiya was getting ready to make LR's available in 2006, they did not have anyone at their business who could comprehend English well enough to write a disclaimer. They contacted me via email and asked me to write a disclaimer for them, which i did. Yamiya's disclaimer was included with the LR's i purchased in 2006 and looked vaguely similar to the disclaimer i wrote for them. (2006 disclaimer attached.)
imo, the only reason to put LR's on vin's 1-4148 is because it is the correct exhaust for this vin range, as per factory parts books.
"No.no's" exhaust were fitted vins 4150-onward.
the HM300 exhaust is not correct for any 1-7414 vin sandcast, the HM300 didn't appear until early 1970. the last sandcast came off assembly line early to mid September 1969.
i've never heard the exhaust note of LR's. i have been told the sound of LR's v.s. "No.no's" exhaust with baffles in place is the same. i have been told the LR's with baffles removed produces a deeper and richer exhaust note.
