Crashed my bike :(

For BMW, 1969. Up until then, the boxer engine had a built-up crank and
roller bearing big ends, and a camshaft above the crank. On older BMWs, and
any Russian, Ukrainian or Chinese boxer (heh), you'll see that the pushrod
tubes are on top of the cylinders. On /5 and later airhead BMWs, they're
underneath. BMW had turned the engine upside-down and put the camshaft
under the crank, changed the crank to a one-piece effort with shell bearing
big ends, and employed the conrods from their car engines. This gave them a
much stronger engine, capable of handling the big increases in capacity and
horsepower that were to come, and that would remain essentially unchanged
for a quarter of a century.

As far as I can discover, the shell bearing big ends and solid crank
appeared on Dneprs in 1971 with the MT9 (which is what sweller's got).
Apart from this, the engine was pretty much the same as before.

Roller bearings are simply wrong for a big end. Even if the crank rotation
was constant, the relative angle of the conrod changes through every
revolution, so the rollers are never at a constant speed and tend to scuff
if the lubrication is at all suspect.

 

I especially like the out of control shot.

 

ROFLMAO

 

You silly sod

 

Bear proposed

I'd say it truly deserves the Carmicheal award for photography.

 

the cont known as PeterT@Home says...

****

 

It's like being there but without the pain.

 

Hoobygroovy!

 

I can't stop looking at it. I must have been there 30 times so far.

 

I am impressed by the lack of damage to the rider's clothing, which
appears to be constructed by some form of multi-layer fibre
construction encompassing the rider's entire body. Furthermore, I have
not seen quite such a pink set of motorcycle clothing since the days of
the Fieldsheer "acid worm" suits in the late 1980s/early 1990s.

The decelleration experienced in the accident does appear to have
caused some peculiar
and potentially disabling eye injuries, however.

 

Sorry to resurrect this old dead thread, but as the ER-5 is in for
it's 15,000 mile service tomorrow will they look at the headstock
(steering pin?) as part of the service, and if not:

(Yes Bear, this *is* a clueless question)

If the headstock/steering pin was damaged when I crashed it in April,
would I have noticed it in the last 1,500 miles? Would there be any
obvious signs, like the bike splitting in two that I would have seen?

If it's look at as part of the service, then that's just fine, but if
it's not then I'll put it on my "Please also look at" list that I'm
giving them tomorrow.

 

They will probably check the steering head bearings.

It takes a *huge* impact to destroy a steering head. It's one of the
strongest bits of the bike.

Just ask them to check the head bearings.

 

On Thu, 2 Jun 2005 21:34:49 +0100,

Thanks for your help.

 

When fio lobbed her CX, I had the dubious pleasure [1] of seeing not
only a fucked steering head, but also a seriously split lid.

Cheers

Paul.

[1] Also the time where fio got the dubious pleasure of meeting Donald
in her tent

 

I ripped most of the lock stop of my FZR when I crashed it. Amazingly
there was no damage to the forks or headstock. Just had a new one
alloy welded on and part-ex'd it for the SV.