Ducati Monster Forum

Moto Board => Tech => Topic started by: FATTIRE on July 28, 2014, 03:54:34 PM

Title: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: FATTIRE on July 28, 2014, 03:54:34 PM
Fellas, I have posted on here a few times already and have been helped out immensely with some of the issues I have been encountering. It would seem that once I fix a problem, a new one develops.

So I have a M750 and installed a 900ss front wheel. I replaced the entire front end of myM750 as it was wrecked. I just got finished mounting it on the wheel. I do not want to tighten down the two clamp bolts on the right side of the bike as I am waiting for the big to sit properly and bring in that little gap. Right now with the handle bars straight, my front wheel cants slightly at about 3 degrees to the right. What would be causing this?

I have tried moving the wheel forwards and backwards to no avail. I have pushed down on the handlebars to press the forks. I am just out of ideas. Your help would be much appreciated.
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: ducpainter on July 28, 2014, 03:56:24 PM
Are the axle and bearing sizes compatible?
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: FATTIRE on July 28, 2014, 04:00:59 PM
I was able to switch out my wheel bearing on my M750 Wheel and install in the 900ss.  My front axel is the same and all fits properly. 
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: Speeddog on July 28, 2014, 04:06:23 PM
Quote from: FATTIRE on July 28, 2014, 03:54:34 PM
~~~SNIP~~~

I replaced the entire front end of myM750 as it was wrecked.

~~~SNIP~~~

Exactly which parts did you replace?
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: FATTIRE on July 28, 2014, 04:10:19 PM
I replaced my bent forks, shattered wheel, and speedometer drive.  All other parts such as wheel bearings, and axel I was able to switch over to new wheel.
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: Speeddog on July 28, 2014, 05:29:28 PM
Most likely the triple clamps are bent, pretty common when forks get bent and/or wheel bent/broken.

Did you have any trouble at all sliding the fork legs into the triples?
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: xcaptainxbloodx on July 29, 2014, 10:07:37 AM
you shattered a front wheel and didnt replace the front axle?
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: FATTIRE on July 29, 2014, 03:11:13 PM
It was not hard at all to slide the tubes through the triple clamps.  All was very easy.  As far as the axle, it is a solid piece of steel and has no bed to it at all.  No need to replace as it is not damaged as I rolled it on a flat surface. 

In any case, today, I am going to align my forks again.   Perhaps I tightened up the fork clamps bolts to much or there is to much tension some place. 
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: Ddan on July 29, 2014, 03:53:50 PM
Are you sure you have the same amount of fork leg below the triples? 
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: xcaptainxbloodx on July 29, 2014, 04:49:07 PM
assuming your forks are aligned properly, and that your triples are straight (cast triples useually snap rather than bend)

the only thing it could be is the front axle/bearings. as those are the largest determining factor in how a wheel lays when bolted in, and are the only items re-used after the wreck, I Am pretty skeptical that they are not the problem.

I mean, even if the forks weren't even, or the triples were bent, a true axle would either physically not fit or would correct measurement errors.

also, as a general rule you, never re-use wheel bearings when swapping from good wheel to good wheel, let alone ones that have seen an apparently catastrophic impact.  the things are like 20$, why risk it?
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: FATTIRE on July 30, 2014, 05:22:15 PM
Well after taking everything apart, I found out that it was the lower triple tree.  It had a slight bend in it just enough to throw it all out of waco.  Now I am just trying to tighten up that front wheel.  As soon as I fix a problem, another one exists.  As soon as I tighten down the axel to 60ft lbs of torque, The wheel does not want to spin freely anymore.  I don't have the clamp bolts tightened either.  is that the incorrect torque spec as that is what I read.  Your though would be awesome.
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: Speeddog on July 30, 2014, 06:13:56 PM
If the lower triple is bent, then it's not prudent to spend time on any of the other stuff until you replace it with a straight one.

Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: FATTIRE on July 31, 2014, 02:05:14 PM
I made that last positing because I have already replaced the lower triple.  When i bough my replacement forks, they came with it.  It was just easier for me to replace the tubes than the upper and lower.  After I found that it was my lower triple that was bent, I replaced it yesterday.  Now, the front wheel sits straight.  The only problem I have now is when I torque down the front axel, the front wheel does not want to move with out me forcing it.  Any thoughts?  The torque spec I used was 60 ft lbs.
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: DarkMonster620 on July 31, 2014, 04:54:48 PM
how much torque to the pinch screws? is about 10Nm
Title: Re: M750 FRONT WHEEL WILL NOT SIT STRAIGHT
Post by: brad black on July 31, 2014, 07:27:55 PM
speedo drive interference or not siting correctly?  there's not too many ways to get that problem.