This Is The EPIC Soggs 92K75 MAGA Thread

[szabgab]

Not sure I understand why the end splines are made of cheese on these bmw’s. My Honda CX500 splines are like brand new and 4 years older!

Jap bikes are a different league when it comes to reliability, although I will be most likely burned at the stake to say this here. CX shafts do not fail, it is just a better construction, but even those need lubing from time to time...

[Soggz]

Shame you can’t put one in a bmw...

[szabgab]

Shame you can’t put one in a bmw...

Yeah...  Although Honda was the first to put injectors in a bike it was another ten years or so,  before they started to put them en mass in their bikes.  I know,  you just had your injectors cleaned,  but it is a simpler and hence more robust system than carbs

[Soggz]

Ah, ok, I know what you mean, as I’ve had the top of the box off to put a new filter in. The silver thing that looks like a waffle maker! Lol.

Ah,so the ‘maf’ is the black box on top of the carcass bodies, the other side of the air box?.
I have a Clymer book here, and there is no ‘maf’ in it that I can find...

[Soggz]

Ah,so the ‘maf’ is the black box on top of the carcass bodies, the other side of the air box?.
I have a Clymer book here, and there is no ‘maf’ in it that I can find...

lol. It’s almost working...

[szabgab]

lol. It’s almost working...

No that is the air box collector.  The "silver waffle maker" is the MAF. Clymers might call it differently, but if you look up the parts fiches floating on the net they help you visualise, what's what. BTW it is a bitch to put back the MAF in it's place, so be careful, especially with that hardened piece of rubber, the mouth sits in

[Soggz]

Ok, thanks. Good idea to mark it before moving?

[szabgab]

Ok, thanks. Good idea to mark it before moving?

No need to, it is self explanatory, it is just a tight squeeze, cable is in the way, you might unwittingly disconnect the connector, might damage the hardened rubber of the big elbow, might be problematic to line up the holes with the threads, these kind of things.

[Soggz]

Ok, I’ll give it a go.
Thank you. I hope that it’s the problem.
It wouldn’t surprise me as it’s been sat for quite a while. Probably startled a spider, and it’s got caught up in it!

[Laitch]

[

I have a Clymer book here, and there is no ‘maf’ in it that I can find...

Clymers might call it differently, but if you look up the parts fiches floating on the net they help you visualise, what's what.

Clymer calls it an air flow meter. BMW refers to it as a volume air flow sensor in parts fiches.

[Soggz]

[Clymer calls it an air flow meter. BMW refers to it as a volume air flow sensor in parts fiches.

Thanks. It’s not all likely to fall apart when I unscrew it from the air box lid, is it? Or is it one unit?

[rbm]

You'd probably really benefit by becoming familiar with the Bosch L-Jetronic FI system. It was very prevelant in the 1980's on several European marques.  This is a link to the manual:  http://jenniskens.livedsl.nl/technical/Tips/Files/Bosch_Technical_Instruction_L-Jetronic.pdf

When you can understand how the parts work and interoperate, then diagnosis is easier, and repair is easier as well.

To answer your question, no the unit will not fall apart on you when you remove it.  It is one integral piece.

[Laitch]

It’s not all likely to fall apart when I unscrew it from the air box lid, is it? Or is it one unit?

It's one unit with an electrical connection attached to it. Do a Google search with the term K75 air flow sensor. Plenty of images are available. Have you checked valve clearances and compression yet?

[Soggz]

It's one unit with an electrical connection attached to it. Do a Google search with the term K75 air flow sensor. Plenty of images are available. Have you checked valve clearances and compression yet?

Hi Laitch, thanks for that. I’m just giving it a quick read. No, not done the compression reads yet, I’m borrowing a set of gauges next week with any luck.

[daveson]

When I replace the driveshaft I orient it so the universal joint can only swing left-right, not up-down, to improve the chance of keeping the pieces parallel.

I'm curious how many km on your cx500, I was thinking of those before I got a brick.

[Laitch]

No, not done the compression reads yet, I’m borrowing a set of gauges next week with any luck.

Only one gauge is needed for a compression test.

[Soggz]

When I replace the driveshaft I orient it so the universal joint can only swing left-right, not up-down, to improve the chance of keeping the pieces parallel.

I'm curious how many km on your cx500, I was thinking of those before I got a brick.

Hi. Thanks for the advice.
My CX.
I bought it with just under 54,000 miles on it. It was sat in someone's garage since around 2004. I purchased it 4 years ago. It took me 2 years to strip and rebuild.(I had to save up for the parts,as I am a father of 3 with and self employed with a small gardening business,so,Unfortunatly,it dosnt pay much,however,I don't see it as work,becuase I enjoy it and it keeps me healthy,and that's important,right?). I bought it from the man that I bought the BMW from,as he owned both bikes,but due to unfortunate health issues,he was advised by his doctor not to ride motorbikes again.
So I bought the CX for £300,and then,3 years later,the BMW for £300. I understand that even if I have to spend a lot of money on it,I will eventually have an awesome bike! The engine seems ok.I spent around £900 on the CX so far,and about £250.00 on the BMW.

[Soggz]

Only one gauge is needed for a compression test.

Ah,ok, I was thinking of balances guages. My mistake.

[Soggz]

Just went ahead and ordered my replacement spline to be welded on in the next few weeks,depending on how my busy mate is. Should be interesting.

[Soggz]

When I replace the driveshaft I orient it so the universal joint can only swing left-right, not up-down, to improve the chance of keeping the pieces parallel.

I'm curious how many km on your cx500, I was thinking of those before I got a brick.

It looked like his when I got it. I really wanted to do something different with it,but I'll leave the BMW as it is.

[Chaos]

I always like the Honda mini-guzzies. Almost bought a new one back in the 70's but would up with Limey rides. 

[Soggz]

Ok, jetronic unit out.
What am I looking out? Should I be lubricating/ cleaning the ‘doors’ inside it to make it open / close easier? Do I take it apart?

[Soggz]

And the shaft. Uv has no play, and the other end splines seem fine. Pity they never made both ends out of the same stuff!

[Laitch]

I bought it with just under 54,000 miles on it. It was sat in someone's garage since around 2004. I purchased it 4 years ago. It took me 2 years to strip and rebuild.

Can you post a photo of the CX after you modified it?

[Soggz]

:D Mass airflow sensor, in order to access it you will have to remove some parts, like the tank, etc. Be careful when you try remove the top of the airbox, the big rubber elbow can go brittle and if you tug it hard enough it might crack. Mine was in tatters and I am not sure, if it was me being a dick or age deterioration, most probably both :)
I
There are two hose clamps on that elbow, no need to remove the one closer to the airbox, only the other one, so you can remove the elbow and airbox as one unit. The other hoseclamp is securing the mouth of the MAF to the airbox.

If cleaning the sensor try not to go all crazy on the thing, the sensor element is sensitive. I have cleaned mine with contact cleaner, even though carb cleaner would have been more thorough.

Hard starting could be many other things as well, I had air leaks, oxidised contacts, weak battery and a failing fuel pump combined with a clogged up fuel filter, since I have got ridden most of those problems, the bike is a joy to start (especially since having 10W40 semi-synth in the engine)

Hi. Is the sensor,the small round object that is hanging down in the mouth of the air flow box? Or rather, the silver unit, I meant to say.