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#286740 - 12/01/09 4:29 pm Bent lower yoke/ Triple Tree  
Joined: Jan 2009
Posts: 117
dracko Offline
BritBike Forum member
dracko  Offline
BritBike Forum member

Joined: Jan 2009
Posts: 117
Canada
Hey guys, I recently bought a set of Trees from a member on the board here and the lower yoke is bent. Just wondering if anybody has a tried and true method of straightening them. I was thinking about using some shims and a vice and clamping them/bending them a little at a time, but I'm all ears because I've never attempted this before. They are 68-70 Triumph 650 trees.

Thanks in advance!

Last edited by dracko; 12/01/09 4:29 pm.
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#286749 - 12/01/09 5:54 pm Re: Bent lower yoke/ Triple Tree [Re: dracko]  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
BritBike Forum member

Joined: Oct 2003
Posts: 11,108
North Georgia, USA
Typically the crown does not bend becasue there is not enough fork stantion engagement there to effect a bend. So it's the triple tree you need to worry about.

The triple tree either looks like a piece of spaghetti (big crash; non-fixable), or it's only out a couple of degrees (little crash; repairable). Additionally, 95% of the time the forks get pushed to one side. That is to say, it's hardly ever a straight-on hit, owing to the fact that most riders try to react in some way to the car/ guard rail/ animal blocking their path. Typically, these type crashes result in damage to only one side of the tree most of the time.

The best way to straighten a triple tree in this common condition is to assemble the tree and crown onto the bike and install 2 brand-new naked stantion tubes (with snug top caps and pinch bolts). By simple observation of the parallelism you can tell which tube has been pushed back. [Based of course on the assumption that a passing motorist did not yank the bike's front end forward. laughing ]

All you have to do then is pull the lagging stantion back to it's original forward position. This is done by turning the fork assembly in the opposite direction of the wreck, placing the foot firmly upon the forward motor mount, and making a judicious application of physical strength at the bottom of the affected stantion to pull it back into parallel with its neighbor.

Works every time. Takes about 4 or 5 tugs and 15 minutes.

Your back will only hurt for a week. bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#286756 - 12/01/09 6:18 pm Re: Bent lower yoke/ Triple Tree [Re: RF Whatley]  
Joined: Sep 2001
Posts: 2,766
Gordo in Comox Offline
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Gordo in Comox  Offline
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Joined: Sep 2001
Posts: 2,766
Comox BC Canada
I think you will be surprised how soft the triples are. Before I start with the straightening I put good tubes into the crown tapers (off the frame) and tighten up the top nuts to bring the tubes solidly into the tapers. This will give you an idea if the crown is bent when you look at the distance between the tubes as you move toward the bottom. The fore and aft issue is also somewhat evident but not easy to see this way.

Gordo


Without frequent roadside repairs there is no fun in riding!
#286935 - 12/02/09 7:46 pm Re: Bent lower yoke/ Triple Tree [Re: Gordo in Comox]  
Joined: Jan 2009
Posts: 117
dracko Offline
BritBike Forum member
dracko  Offline
BritBike Forum member

Joined: Jan 2009
Posts: 117
Canada
Hey Whatley and Gordo, thanks alot for the info. The trees aren't bent much, so it sounds like it won't take much to straighten them out. I don't have a new pair of tubes to use, nor will I any time soon as I've since bought a new lower tree locally and have the front end partially assembled with some "used" tubes. But maybe down the road I'll straighten them out before selling them. Unless someone is looking to buy a slightly tweaked lower tree for a 68-70 Trump?

thanks again! I appreciate the info.

#286954 - 12/02/09 10:55 pm Re: Bent lower yoke/ Triple Tree [Re: dracko]  
Joined: Jul 2007
Posts: 451
Bob G Offline
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Bob G  Offline
BritBike Forum member

Joined: Jul 2007
Posts: 451
redondo beach, ca
You can easily straighten triple trees on a hydraulic press and a v-block. If any one wants the procedure just let me know. I have probably done a couple dozen over the years.


Bob Gregor
#287403 - 12/05/09 10:09 am Re: Bent lower yoke/ Triple Tree [Re: Bob G]  
Joined: Aug 2005
Posts: 187
TJD Offline
BritBike Forum member
TJD  Offline
BritBike Forum member

Joined: Aug 2005
Posts: 187
Devonport Tasmania
Have a look at section G4 of the workshop manual.


Moderated by  John Healy 


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