BMW K75S

10,000kms
                                         


The K75 is in stunning completely original condition.  Apart from an inevitable blemish or two it still has a showroom look.

It is one of the few low mileage older motorcycles that I have purchased that has been stored correctly, and not suffered unduly for its 20 years plus off the road.  It is complete with all its books still in their pouches, and a complete extensive tool roll under the seat.

 Fuel pump,fuel strainer and rubber vibration damper, internal fuel filter,and internal submersible hoses have been replaced.

The fuel pump wasn't working and the rubber items were somewhat perished and were replaced as a matter of course. 

All parts fitted were new, apart from the fuel pump. The new vibration damper is impervious to alcohol fuels, unlike the BMW original. The fuel pump was a very tidy, but used item I purchased from a BMW specialist in the US.  Much later on I sat the original fuel pump in a jar of acetone, connected 12V to it and it instantly sprang to life... Oh well.  It had ingested a tiny piece of perished vibration damper which is enough to lock it...the acetone had dissolved the tiny piece of rubber and now I have a spare fuel pump.... 

I was very dissapointed with the submersible high pressure hose that I purchased from the pump supplier and ordered more from another US BMW supplier, it was different  consisting of a hard extruded plastic, just like irrigation dripper line. absolutely apalling ! .  I couldn't use any of it.  ended up getting very good quality submersible hose (manufactured by Dayco) locally from SOUTHCOTTS in Adelaide. I purchased a large quantity of standard high pressure hose on the reel and the submersible hose at wholesale price ... and paid less than a third the cost for the US sourced hose, plus much much better quality, this is the quality of the original and in fact probably better.... Go local !

I had to redo the tank... a fiddly job..with the better internal hose, but glad I did it.

I was paying about $30 a metre for standard pressure hose from the retailers here, but my massive reel works out about $10 a metre or less.

I removed the internal fittings from the tank and cleaned it out with acetone. Over a few weeks I then built up the new internals into the tank.

I removed the injectors,..and gave them an acetone bath to wash away any petrol varnish. 

It started virtually instantly and idled strongly as soon as i put the fuel tank on and fuelled it.  ..

When it was first running it had a real flat spot between 600 and 1200rpm..I suspected a vacuum air leak.   I replaced all the vacuum caps on the balancing pipes and had a look around for obvious leaks.. I removed the air box to find that the large air hose to the plenum had a good size split around its circumference where it clamped to the plenum chamber.. looked like the stainless hose clamp may have had something to do with this.... Air entering here was not passing through the throttle body and was unmetered...so the injection system was blind to it..not enough fuel was being injected for the correct air/fuel ratio

Replacing the intake hose took care of that .... 

Another task was regreasing the steering head bearings... the BMW grease solidifies to the texture of cold candle wax and chokes the rollers and has to be removed and replaced...the whole front end has to come off for this.

 

The brown colour is the colour of the factory grease...it is not rust. It has the consistency of very cold butter in this state... 

I have had plenty of practice doing this.. nearly ALL the K BMW's I have imported over the years are in the same state.

I just wonder how many people are riding K bikes around with headstem bearings in this state of lubrication, quite a few probably ?   

It takes practice and some time in getting the bearing preload right so the bars turn with minimum friction, and yet tight enough to prevent any chatter and premature loosening of the head stem bearings with use.  Visible in the pictures halfway up the stem, is big blob of silicon grease for steering damping... unique to the75's.

One advantage of this work is that it also makes it possible to access and thoroughly clean and service every part of the bike...those hard to get to places.....and to replace the pressure fuel line to the fuel pressure regulator, renew the brake fluid and coolant and to lubricate the radiator electric fan bearings....

 

Tool roll and some of the books above, there are a couple more not shown

Many hours of work has gone into this K75S

A new Bridgestone battleaxe went on the front, along with a new battery ....

10,300KMS : This is as close as a brand new K75 as anyone is going to get in this universe

This BMW is in stunning condition and It rides wonderfully well...   

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