Ducati 350 scrambler 5th gear issue
Posted: Sun Aug 20, 2017 1:08 am
Hi all. Im new to the forum here.
I bought a 1969 Ducati 350 scrambler about a year ago as my new project bike. Never owned a Ducati before...but I'm lovin this bike! I have a 63 Honda Benly and a 66 Honda Dream....so as far as old bikes go, this is different for me!
I never heard the motor run until recently. (Project is in its final stages) The transmission was working OK when I first started riding it to tune the carb, but it quickly started to have issues going into 5th.
What I've done so far:
-I Have pulled the selector box off it and went through it. The spring and detent ball etc all seem fine. It shifts well on the work bench and "feels" fine when I shift it on the bike.
-I've read all the advice on how to properly shift the bike.
At this point in time, unless I'm missing something.... I believe I'm going to have to bust it down and inspect the tranny.
One thing I should mention is that it was still going into 5th gear (not well, but engaging) until I changed out the front sprocket. After I did this I believe it seemed to get worse. I read some where that over-torquing could cause issues with a shim. I didn't use a torque wrench the first time, but am fairly confident I didn't apply any crazy amounts of force to it. I then used a torque wrench on it and was able to confirm that I had less than 50 foot lbs of torque on it. I left it torqued to 50 ft lbs. So unless I'm doing something wrong....I don't seem to think me changing out the sprocket should have really created any problems on this shaft?
I have ordered a Ducati workshop manual by Tom Bailey in preparations for a tear down.
Does it seem reasonable that I'm headed down the right path?, and also - any thoughts on what the issue may be? I was thinking some kinda shim issue or shift fork issue.
Appreciate any thoughts or comments on common issues.
thank you,
Jeff Fisk
Kincardine Ontario.
Canada
I bought a 1969 Ducati 350 scrambler about a year ago as my new project bike. Never owned a Ducati before...but I'm lovin this bike! I have a 63 Honda Benly and a 66 Honda Dream....so as far as old bikes go, this is different for me!
I never heard the motor run until recently. (Project is in its final stages) The transmission was working OK when I first started riding it to tune the carb, but it quickly started to have issues going into 5th.
What I've done so far:
-I Have pulled the selector box off it and went through it. The spring and detent ball etc all seem fine. It shifts well on the work bench and "feels" fine when I shift it on the bike.
-I've read all the advice on how to properly shift the bike.
At this point in time, unless I'm missing something.... I believe I'm going to have to bust it down and inspect the tranny.
One thing I should mention is that it was still going into 5th gear (not well, but engaging) until I changed out the front sprocket. After I did this I believe it seemed to get worse. I read some where that over-torquing could cause issues with a shim. I didn't use a torque wrench the first time, but am fairly confident I didn't apply any crazy amounts of force to it. I then used a torque wrench on it and was able to confirm that I had less than 50 foot lbs of torque on it. I left it torqued to 50 ft lbs. So unless I'm doing something wrong....I don't seem to think me changing out the sprocket should have really created any problems on this shaft?
I have ordered a Ducati workshop manual by Tom Bailey in preparations for a tear down.
Does it seem reasonable that I'm headed down the right path?, and also - any thoughts on what the issue may be? I was thinking some kinda shim issue or shift fork issue.
Appreciate any thoughts or comments on common issues.
thank you,
Jeff Fisk
Kincardine Ontario.
Canada