Quantcast

Driveshaft woes

Yamaha Star V-Max VMAX Motorcycle Discussion Forum

Help Support VMAX Forum:

randu

New Member
Joined
Dec 29, 2020
Messages
4
Reaction score
1
New to vmax, new to forums... decided to save some $ and remove rear tire to take to Cycle Gear to install new tire. Never messed w a driveshaft before but figured I was competent enough. Unfortunately, instead of the driveshaft separating at the final drive/ tire, the whole shaft came out. Got tire on, reinstalled and bolted everything back together. Thought I pulled it off til I tried to ride-horrible grinding noise. Didn’t ride, shut it off and took tire off again. Drive shaft will now not come out or go back in to where the splines seem to engage. The shaft is also sitting left of center in tubing and won’t go in straight. What to do??!- can I access the front splines of drive shaft somewhere? Is there a fix for this anyone knows about? Did I just ruin my new ( old) project bike? -help?
 

Fire-medic

Well-Known Member
Supporting Member
Joined
Mar 25, 2011
Messages
10,547
Reaction score
839
Location
Miami Florida
Nah, probably nothing wrong other than the splines aren't properly-engaged. Just remove the rear end w/the driveshaft attached, and try, try again. See that plug in the driveshaft housing by the engine? You can pop that out, and use that as a place to view your effort to insert the splines correctly.
 

MaxMidnight

Well-Known Member
Joined
Dec 1, 2007
Messages
2,007
Reaction score
210
Location
Cumbria, England.
I’m trying to understand why the driveshaft came out during a rear wheel removal.
Indeed a mystery, even with Dymags and wider tyre I only need to deflate it to get the wheel out.

Mr Randu, Can we assume that the splines are OK and not damaged?
If so this is how I get mine in (if I'm allowed to say that?).

First step is to make sure that the UJ is facing downwards; it may be easier to see this if you pull the rubber boot on the middle gear back.
Now make the the driveshaft also points down, you may need to rotate the shaft a little.

Sit on the floor behind the swinging arm and feed the assembly in and feel for the UJ. With a little jiggling about you should be able to get the two to engage and one final shove and it's in.

That's easy to type but it can be a right bitch. It either goes in strait away or it seems to take ages. Whilst I haven't tried this it may be possible to have an assistant guide it it from the UJ end if the fore, sorry rubber boot is pulled back.

Please not that any smutty innuendo or association with real life experiences about this post are in the readers mind. :eek: ;)
 

one2dmax

Well-Known Member
Joined
Apr 6, 2006
Messages
15,583
Reaction score
441
Location
Derby Kansas
When removing the rear diff that will almost always pull the shaft with it due to the friction of the seal in the diff is greater then the friction of the shaft in the u-joint. Once the rear diff is out you will want to remove the shaft from the diff and reinstall it first. Then install the diff. Before snugging the diff down all the way you need to reinstall the wheel/tire/brake assembly to hold it all squared up then you can tighten the nuts on the diff to arm.
 

02GF74

Well-Known Member
Joined
Mar 26, 2020
Messages
314
Reaction score
78
Location
UK
I can't visualise what is going on but before you drive off, put the bike on the centre stand and rotate the rear wheel to check all is ok before applying power. Then turn engine on, clutch in, put it in gear and slowly release clutch to check. That way you puts no stress on the drivetrain.

My guess, and hopefully I am wrong, is somehow the splined end was not fully seated and now has been chewed up so it won't come out, assuming it is even possible to assemble it like that.
 

randu

New Member
Joined
Dec 29, 2020
Messages
4
Reaction score
1
thank you all and yes 02GF74, im afraid thats exactly what happened. it completely snugged all the way down but once all put together and put in gear (my biggest mistake) it made awful grinding sound. and the shaft refuses to come out again (it came out automatically when i first pulled the wheel) it also will not re-seat in tube in an apparent straight line, tried to re-engage it for hours and all it will do is come back out about an inch or so. im off tomorrow and will try to figure out how to see that end of shaft/spline behind rubber boot. Fire-Medic, can you explain the 'plug in the driveshaft housing near the engine'? its not the chrome circular on frame directly in front of driveshaft is it? thank you all again. i havent even ridden this bike yet aside from a test drive!, i finally got it legal, replace the tire, attempted to set off on my maiden voyage and -!@#$, hopefully its something i can figure out
 

Fire-medic

Well-Known Member
Supporting Member
Joined
Mar 25, 2011
Messages
10,547
Reaction score
839
Location
Miami Florida
thank you all and yes 02GF74, im afraid thats exactly what happened. it completely snugged all the way down but once all put together and put in gear (my biggest mistake) it made awful grinding sound. and the shaft refuses to come out again (it came out automatically when i first pulled the wheel) it also will not re-seat in tube in an apparent straight line, tried to re-engage it for hours and all it will do is come back out about an inch or so. im off tomorrow and will try to figure out how to see that end of shaft/spline behind rubber boot. Fire-Medic, can you explain the 'plug in the driveshaft housing near the engine'? its not the chrome circular on frame directly in front of driveshaft is it? thank you all again. i havent even ridden this bike yet aside from a test drive!, i finally got it legal, replace the tire, attempted to set off on my maiden voyage and -!@#$, hopefully its something i can figure out
No. Here's a pic.
VMax driveshaft rubber plug.jpg
 

Traumahawk

Well-Known Member
Supporting Member
Joined
Dec 12, 2011
Messages
8,020
Reaction score
288
Location
Lawton, OK
With the driveshaft out, the "collar" the driveshaft fits into, will fall down. When Installing the driveshaft, tilt the driveshaft slightly up (to pick the collar up) and spin the driveshaft to the right. Thats the easiest way that Ive found to make it drop into place.
 

02GF74

Well-Known Member
Joined
Mar 26, 2020
Messages
314
Reaction score
78
Location
UK
^^^ that sounds plausible, you'd think Yamaha would have designed it so that would not be possible. It may well be the UJ and shaft are wedged, if the shaft cannot be pulled out then maybe putting into gear and rolling backwards to reverse what was done can free it? Note. this is my best guess so don't blame me if something breaks!!
 

Latest posts

Top