The ones that sound great being wrung up to redline are the R69 models (the S, and non-S), with their higher compression ratio, and higher redline.
No regrets for me, I'll never sell mine, it's a family heirloom when I'm gone.
Originally Posted by bpeckm
Wish I could have kept mine.....
I STILL have the sound of wringing the engine out to redline, ever so suhweeeeeet!!
btw, those carbs are not the "lifting diaphragm" type as suggested by several posts above: simply cracking the throttle lifts the round slides and allows in plenty of air for compression testing.... one CAN over-analyze all this stuff! Take care of slingers, ride her and enjoy the sweet harmonies of low compression engine, shaft drive and a genteel twin exhaust... 'tis mesmerizing!