Hello. This is my first post here so hopefully i don't have too much trouble learning the format of this forum.
Great looking CM91 you have. You've done a nice job. Yes, the 1 up, then one full down to neutral, and then 2 down is the normal shift pattern for the CM91. The owners manual recommends using 2nd and 3rd for normal riding, and the use of 1st gear for pulling out when riding with a passenger.
If you don't mind, i've got a few questions that i hope someone can help me with. Maybe i will start a thread on my 1966 CM91 "resurrection" so i'm not hijacking this thread.
It looks as though you may have had the cylinder off during your restoration and i was wondering if you have any good pictures of the cylinder studs. Someone had the cylinder off of mine and did bad things with silicone sealer at the base gasket and it looks as though they replaced one stud with what i'm guessing to be a stud from a CT110 or something as it is about an inch longer than the other 3 studs. I've seen some "A" and "B" studs available but i have no idea which one i need. According to the parts info on partzilla.com, the CM91 used 4 different studs, A,B,C, and D, while the CT90's of the day used 2 "A" studs and 2 "B" studs. I haven't found studs C or D available anywhere.
I have a 69 CT90K1 that i can rob an A or B stud from it for now to get the CM91 back together, but i can't figure out which stud is which so i'm not even sure which studs i have and which one is missing. I know that the lower left stud should be one that has the full shank diameter just below the threads for the oil flow, but other than that i'm confused. The 11911-046-000 dust guard that is held on by the two lower studs is missing, and i'm assuming that because of the addition of the guard when compared to the CT90, the two lower studs would have been longer, hence the different "C" and "D" studs.
In my google searches i've found past ebay auctions for the dust guard selling for like $80, but i found the part number listed on a lawnmower website selling for $8.77, but there was no picture of the item. I just took a gamble and ordered it anyway. I couldn't imagine that Honda would use the same exact part number over for a totally different part, but who knows. Maybe i scored an elusive, rare, hard to find dust guard dirt cheap, or i may have just purchased a lawnmower part that i can't use. If it is indeed a lawnmower part, i won't loose much sleep over the $8.77.
I've read that the U.S. model of the CM91 had several differences than the rest of the CM91's sold all over the world. No "winkers", no "90" on the side covers, bobbed rear fender like the CT90, and there may be other differences. I was wondering if these differences is designated by the "A" in the vin number. My vin is CM91A-1112XX. Does yours just begin with CM91-1XXXXX? Was the cylinder originally black on yours, as mine is painted silver to match the side covers.
Again, your bike looks great. Have you been able to get it running correctly or are you still having an issue? I hope someone here has an idea on my studs question. Thanks to all in advance for any help. I'll probably be posting a good bit here for awhile so please log in from time to time if you have a chance. Thanks.