Oilhead Zero Zero

[Comfy Old Boots]

I've read just about everything on the interweb about doing the routine 6000miles valve and throttle body service. I'm new to this and need a little advice before I start. I hope i've bought into a bike I can get running reasonably well with my own two hands.

I'll be doing the valves tomorrow morn when bike is stone cold. I've done the throttle body sync a few times and seems ok as a procedure even though I'm using vacume guages and not mercury guages. I want to do a zero zero routine on her too. I've figured out how to read the voltages comming out of the TPS and know that they can also be read from pin three on the motronic unit. I've done both... Who's actually done this on an oilhead that's willing to banter a little this evening???

Q is, which is the best place to set zero on the tps? Should I use the motronic or the tps cable socket (i like to use guitar strings to get the DVM attached)

Also, I'm prepared to go back to mr bmw but not without a fight damit! Even if I end up with a slight surge, I'll be happy. Has anyone done this on an late nineties 850r?
I'm not a tosser but you can call me one if it makes you feel any better

If you have any experiences or advice on this topic I'd appreciate it.

 

[Stewart H]

Theres a pretty good description on ADVrider somewhere.
http://advwisdom.hogranch.com/Wisdom/
Stewart

 

[Comfy Old Boots]

Thanks Stuart, I've probably read it. Zero-Zero buy Rob Lentini I think? I've got a telephone books worth of articles on the subject and have been cross referencing them and there are inconsistencies. I'm also interested in how to measure the 'ping' the bosch unit gives when things are right...mentioned but not discussed in any of the articles except in passing.

EDIT

CHEERS STUART...NEW STUFF TO READ...

EDIT EDIT

Yep read it already. I'm going to just do a full zero zero tomorrow with the valves from cold.

 

[Ogmios]

I'm not a tosser but you can call me one if it makes you feel any better
.

yer a Tosser!
only saying that to make you feel welcome of course....

anyhow.... Somebody help this man! poor sod has to work with me!
needs sympathy at least...actually, it's probably counselling he needs.

sheeeit! is that the time?
Bye

 

[Comfy Old Boots]

Thanks OG. I've been looking at one of these

ultimately, I don't think I can achieve what the bosch unit achieves easily. Hence the above

Throttle position may be constant but different conditions will require a different fuel air ratio...like up a hill for example. I'm in sooo over my head but she's riding much better than yesterday! Need to check the fuel as well. This might take some time but a general upgrade of some parts is inevitable.

 

[Comfy Old Boots]

Also, this site is a fantastic read. Great to see a section for us oilheaders

also what is this?

 

[boxer]

What problem are you experiencing that makes you want to 00?

 

[Steptoe]

Please, don't do a zero zero.

Just set it up properly to start with and then there really is no need to start messing with the throttle stops..

 

[(RIP) Bin Ridin]

FK,
Move away from the bike....
Listen to Steptoe,
Bin

 

[Comfy Old Boots]

Thank you

I have NOT touched the left throttle body stop screws. I'm still going to do another throttle body sync and a valve clearance from cold. I feel good lads. I've done nothing wrong. YET. Thanks again. I WILL NOT DO A ZERO ZERO.

Neooob standing still.

FK.

Ps. What about a TFI? Any of you lads in the UK have a decent place to stop off on tour? Pref. with a few local attractions ..perhaps in Wales or Liverpool or,,,

 

[Comfy Old Boots]

FK,
Move away from the bike....
Listen to Steptoe,
Bin

Ok. Can it be sorted that I get swapped / traded a suitable machine for my own purposes? Can I successfully get a power unit for my bike or should I eat humble pie and get Motorad (they must be going hohoho now) to do it for realitivly little money ( they will btw) Remember it's relitive. I'm in the middle of the night in somewhere and I have to bodge a fix for random air manifold leak? Maybe I love the bike too much and need a loud noisey bastard of a single to tweak and love instead. Wife and mistress

 

[Comfy Old Boots]

Please, don't do a zero zero.

Just set it up properly to start with and then there really is no need to start messing with the throttle stops..

You mean the valves and all the other stuff like the fuel pump, fuel lines, air filters, air manifolds and stuff like oil, break pads, brake fluid, cables, small stones in cables and tyres?

What's setting it up properly mean Mr Steptoe?

Noob

 

[Comfy Old Boots]

I've given up. I've just booked it in to get sorted by people who know what to do. I'm holding my hands up here. I can't do this. It gut's me to say it. Better to have tried and failed than to have never tried and be forever wondering...

Very frustrating. I just can't get the balance right. It's been a rewarding experience though. I understand exactly what it is I'm trying to do and can see the results in practice but out on the road the bike isn't right...fuel mixture is wrong. Valuable lesson for me. Hopefully it'll be of help to someone else. IF IT AINT BROKE DON'T FIX IT.

 

[littleredrooster]

I've given up. I've just booked it in to get sorted by people who know what to do. I'm holding my hands up here. I can't do this. It gut's me to say it. Better to have tried and failed than to have never tried and be forever wondering...

Very frustrating. I just can't get the balance right. It's been a rewarding experience though. I understand exactly what it is I'm trying to do and can see the results in practice but out on the road the bike isn't right...fuel mixture is wrong. Valuable lesson for me. Hopefully it'll be of help to someone else. IF IT AINT BROKE DON'T FIX IT.

For anyone else reading this thread, I strongly recommend that you DO NOT DO A ZERO=ZERO adjustment as per Rob Lentini. A good mate of mine tried it, but lost the balance on the throttle bodies altogether. Bear in mind that these are set at the factory with very sensitive air-flow meters to get the throttle-stop positions correct. If you shut the butterflies altogether, you have the devil's own job in regaining the correct position. By all means do the TPS setting at tickover (.38 - .40 volts) but please don't try to achieve the zero position.

 

[cookie]

For anyone else reading this thread, I strongly recommend that you DO NOT DO A ZERO=ZERO adjustment as per Rob Lentini. A good mate of mine tried it, but lost the balance on the throttle bodies altogether. Bear in mind that these are set at the factory with very sensitive air-flow meters to get the throttle-stop positions correct. If you shut the butterflies altogether, you have the devil's own job in regaining the correct position. By all means do the TPS setting at tickover (.38 - .40 volts) but please don't try to achieve the zero position.

the zero zero is not actually that hard to do, but it is fairly pointless in most cases.
it is set by bmw on a flow bench during manufacture, and i think they get it better than we can

 

[Stewart H]

I have a left side throttle body to fit at some point, to do this I will need to swap the TPS over from the old one, whats the recommended procedure? swap it, then check the voltage at idle? followed by using my carb balancer?
Stewart

 

[Comfy Old Boots]

It all looks simple on paper ,Don't do it

 

[Comfy Old Boots]

The end is nigh

I've reread everything on this and started thinking about Ogmios' advice.

I've a possible air leak on on the RHTB. Gasget/interconnecting rubber seal looks perished...i can feel a put put put of air on my hand while adjusting the RHTB stop screw

Was on tank 2 of this new Maxoll 5%bioethanal fuel when it started going funny - fuel cap closed but not locked while on a run in very misty dub mountains

Fuel pump has small tear on protective gauge when I changed oil filter a wee while back would also account for sudden bad running ?

I ****ed with the tps and based figures on another model of bike, then messed with the valves, rhtb stop screw and both air recirculation brass screws. She now runs like a dog and I've got an expression to match.

At least I know I cannot do it. If I had proper figures and perfect cables, gasgets, fuel system and the proper set of guages, theoretically this could work but I've stepped away from the bike and will have to consider the very real possibilbity that it might sit there for a week (public transport eek) I can get her to the shop but don't want to risk hurting more than i have already

Nothing I can do at this point will help except load up on the 'ol visa credit...get her right and sell her immediately. Mind you when she's running well she's quite good fun
LOL
FK>

Also, sorry for the c'ssing. Thanks for the time and space to vent...no pun intended

 

[Ogmios]

i'm not being smart, but.....

I've reread everything on this and started thinking about Ogmios' advice.... . . ...

...you dont mean the original (not in this thread) suggestions i made about ensuring the basics were right to start with?
~ re; possible air leaks and fuel contaminant (water). . . . .....

ooohhh.
um.
Good Luck.

 

[Comfy Old Boots]

Yep. Those suggestions I used the possible fuel contamination as an excuse to try the other procedures.