Enfield Tracker: War Pig Rennaissance

LOL. That's actually VermontDMVese for "Motorcycle 728" I think.

And I just realized those pics predate the little tach I put back on up front.
 
Looks great. the small trail figure that the longer shocks create could be exacerbating the underlying problem of your wobble. How are your steering head bearings and swing arm pivot bushings? does it wobble on acceleration more? if so it could be too soft of shocks causing the front end to unload. many possible causes. what are your rake and trail figures?
 
doc_rot said:
Looks great. the small trail figure that the longer shocks create could be exacerbating the underlying problem of your wobble. How are your steering head bearings and swing arm pivot bushings? does it wobble on acceleration more? if so it could be too soft of shocks causing the front end to unload. many possible causes. what are your rake and trail figures?
Click to expand...

Steering head is solid; new taper bearings have no detectable slop or wiggle. Swingarm got new bushings when the bike was built as well and I don't feel anything untoward when cycling it with the shocks off.

The wobble isn't really speed-dependent, in the sense of happening at a specific speed or anything, though it's really only an out-of-control problem at freeway speeds. Not trying to be contradictory; it's just that it's not like once you hit 88mph the flux capacitor takes you on a trip. It is definitely happening in tandem with dips or humps in the road that start an oscillation which grows increasingly out of control. Weighting the front end and easing off throttle (vice chopping it) seem to help, but it's been right on the edge of throwing me off twice now, both times that I've braved the freeway lately.

My feeling was that it was trail-related, esp given that the shorter shocks reduce/eliminate the issue. Neither front nor rear end are what I'd consider too soft; there are cartridge emulators and thick oil in the fork and the rears are Hagons intended for Enfields, with adjustable damping that I run mid-range. I guess some more experimentation with damper settings and tire pressure could be warranted though.

I'm not sure how to do rake and trail measurements on a moto in the real world, so I guess I'll have to google/youtube it... Certainly appreciate your help.
 
here is a calculator I have used. the hardest measurement to get is fork offset, it will take some eyeballing unless you remove the top triple clamp, however it is the most critical as small changes here can have big effects on the trail value. - this is why triple trees intended for racing have adjustable offset. Most tire manufactuers will have the tire diameter listed on their website. If you dont have a digital angle finder you can get an angle app on your phone to determine rake. https://rbracing-rsr.com/rakeandtrail.html
 
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