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bmw-mono-club· members of the bmw-mono-club are interested in the single cilinder BMW motorbike
Hello Allan, I was trying to read between the lines from your posts on other boards whether you still owned any of your bikes. When I first got interested in...
... It's been a matter of space to keep all those bikes, freeing up money for more pressing needs, and the infirmities of old age. I started with the R27 ten...
A friend suspects that his R25/3 may have a valve timing issue because it won't go above 80Km/h. He said that the compression is good and he just spent...
Has your friend checked the air flow? I've had this problem with some bikes where the air inlet was too restricted. Knowing that the R25/3 has this weird air...
He said that the carb has ben recond' but that doesn't mean there isn't a restriction in the air flow, could be something as simple as that, I'll ask. Ben...
Ben, ... Like an obstructed air filter, for example! It is often overlooked. Been there, done that (blush). With regard to the valve timing: I cannot imagine...
I will ask about the air filter and any kind of restrictions. I also asked if the bike was idling OK as I would suspect that if the timing was out a tooth then...
I have noticed that when the engine of my R25/3 gets hot after a fair run, the ignition becomes irregular. Recently, in a massive traffic jam it actually died;...
Hi, What you describe make me typically think to a condensator problem. I had the same issue, some years ago: I couldn't start my R 25/3 engine, when hot, and...
... Thanks for the advice JD, I will try the condensator first and see what happens. I will keep you informed. So far, on our 160-200 km monthly excursions...
tienkho, I have had the exact same issue and solved it by replacing the condensor. It could of course also be the coil. The condensor is cheap. The coil is ...
... Bart, Many thanks for the response. Yes I will try replacing the condensator first and then if necessary, the coil. By the way, have I thanked you for...
A kind soul let me take his r60/2 for a brief spin today and vs. my r25/3 it was an entirely different bike. duh right? I'm curious is it possible to have a...
Erik, In my R25/2 I mounted a R26 gearbox. This changed the first gear ratio from 1:6,1 to 1:5,33. For easy gearbox removal I replaced the 4 studs with which...
... It is not a good idea to ride both a single and a twin. I am now finding my R27 more fun to ride now that it no longer has to compare its power and...
Han, How much of a difference does that change in first gear ratio from 1:6,1 to 1:5,33 make. Is it really noticeable? I have a reconditioned R27 gearbox...
If the cam gear is out by one tooth it will probably run. If the cam is advanced the maxiumum torque will be about 1500 rpm lower, if retarded, torque will be...
Erik, Allen and Ben, Please accept some precisions to my previous reply. When, in 1966, I mounted a R26 gearbox in my R25/2 it was not in view of improving a...
I'm curious is it possible to have a longer 1st gear on these singles? Mine is so short as to be annoying...you have to shift up to 2nd (not an easy feat on...
Great information; thank you all. That 1-2 shift is an important one when cars are following for sure! I will embrace the character of the revvy little...
Hi I have an r26 where the accelerator cable is sqeezed between the tank and frame on the opposte side to the throttle twist grip. Is this correct- shouldn't...
The clutch in my R27 is original. It had 3,200 miles on it in 1975 when the bike was abandoned under a house and later put into boxes. It looked OK when I...
Allan, You can remove the engine and transmission as a unit. (unlike how I answered once in a previous post) It would help you considerably if someone was with...
Alan, I put a new clutch in my R27 back in 2000 and it is very smooth even with 8000 miles on it. You can just pull the trans and keep the motor in the bike. ...
... If I do it myself, I would be lifting alone, also would like to avoid pulling out my 12V electric wiring from the engine and its overloaded grommet, and so...
Allan, The R27 clutch takes standard M6 bolts. If yours are in good condition, they should fine to use over. The Slash 2 clutch tools are 8 X 1.00, and of...
... Yikes. Before I get into this, a couple more questions. I don't know that my R27 clutch is bad. It has always had a sudden engagement compared to my /2...