BMW K bikes (Bricks)

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1Back to top Go down    New Member on Mon Oct 15, 2018 3:26 pm

Erski1

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Hi everyone 6 months ago I had a couple of boxes of parts now have a running K100RT. Still on lift running at idle but stalls as soon as open throttle smells rich. Any starters for 10 would be gratefully received.

    

2Back to top Go down    Re: New Member on Mon Oct 15, 2018 3:34 pm

Erski1

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3Back to top Go down    Re: New Member on Mon Oct 15, 2018 4:55 pm

Ron Ashurst

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Welcome to the forum. These guys can help you out.


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1988 BMW K100LT ....minus the fairing.
    

4Back to top Go down    Re: New Member on Mon Oct 15, 2018 9:36 pm

Woodie

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Man that it is one skinny little knobby to go on the front end!† Welcome and I hope you get things sorted out soon


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1985 K100RT
52667
"Keep your stick on the ice.† We're all in this together."† Red Green
    

5Back to top Go down    Re: New Member on Tue Oct 16, 2018 12:28 am

MartinW

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Welcome, check the "Z" breather hose, check for vacuum leaks around the throttle bodies, check the fuel return line to the tank it can crimp over where it enters. If you can get it to idle at 1000 RPM press the green starter button. If the mixture is right the revs should stay the same or rise slightly. If it drops or rises significantly the mixture will need to be adjusted via a 5mm Allen screw that resides under a rubber plug on the top of the left hand corner of the airbox. If you have access to a exhaust gas analyser great, if not look up the lean drop method.
Regards Martin.


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K75s Hybrid
    

6Back to top Go down    Re: New Member on Tue Oct 16, 2018 4:15 am

Erski1

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Thanks I will try those suggestions first, I did replace all pipes on rebuild including the z pipe but will double check connections but didnít touch the throttle bodies.
And Woodie wonít be going that thin at the front, was thinking naked bike with a roadster/off-road theme with some knobbly tyres. Any suggestions?

    

7Back to top Go down    Re: New Member on Tue Oct 16, 2018 3:40 pm

MartinW

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It's highly unusual for a Brick air cleaner to be blocked but it is a remote possibility. Also critters have been known to take up residence in the air box.
Regards Martin.


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K75s Hybrid
    

8Back to top Go down    Re: New Member on Tue Oct 16, 2018 3:45 pm

Erski1

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Thanks Martin have rebuilt from scratch so no critters but think there maybe some parts showing age. Disconnected the TPS and had an immediate improvement not ideal but definitely better still idling fast anyone know how to drop the idle

    

9Back to top Go down    Re: New Member on Tue Oct 16, 2018 5:54 pm

MartinW

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Under no circumstances touch any of the throttle body screws marked with blue paint. The idle is adjusted via a screw located in the centre of the throttle bodies. The bike needs to have the cable set correctly and be at correct running temperature. Basic stuff like this is in any of the workshop manuals which are available as a download, or printed Haynes or Clymer or both. One of the first things you should get is a manual.
Regards Martin.


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K75s Hybrid
    

10Back to top Go down    Re: New Member on Tue Oct 16, 2018 6:00 pm

Erski1

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Thanks Martin I have both manuals having just retired from 30yrs of being a cop I think I have to know sit back and start reading rather than as all men do try to guess my way through

    

11Back to top Go down    Re: New Member on Tue Oct 16, 2018 10:23 pm

Woodie

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Poke around a bit and you can dig up some awfully beautiful bikes on here to inspire you.† Here's one that I like and it started life as a police bike too.††

It's interesting to me to see the colour you chose to paint your bike† Very Happy† Mine started off that colour and now it pretty much looks like a cop bike without the decals and lights after I painted it white.† Here in Canada the police bikes are almost exclusively HD's and in Ontario they seem to favour black and gold.

Diving into the world of K is a happy way to indulge your retirement!

Cheers, Woodie


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1985 K100RT
52667
"Keep your stick on the ice.† We're all in this together."† Red Green
    

12Back to top Go down    Re: New Member on Wed Oct 17, 2018 12:09 am

MartinW

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The only differences I have encountered with a disconnected TPS is that it is a lot smoother to ride at on off throttle carpark speeds. The only bad side effect is it will backfire on overrun if the choke is on. Previously I had chased the K75 they all do it backfire problem which was put down by many as a maladjusted TPS switch. But in order to eliminate the backfiring I had to do the following.
1/ Correctly adjust the mixture.
2/ Eliminate all vacuum leaks.
3/ Eliminate header to muffler leaks.
4/ Clean the injectors and get them equal and showing the correct spray pattern.

With those four things done the TPS only effects the backfiring when the choke is used.
Regards Martin.


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K75s Hybrid
    

13Back to top Go down    Re: New Member on Wed Oct 17, 2018 2:32 am

Erski1

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Thanks both for the recent comments and suggestions from a mechanical perspective I will follow your 4 step approach Martin and let you know how I get on and aesthetically I do like the look of the bike you posted Woodie, Iíve only painted the frame as yet, the tank as you can see was over painted red but can still see the Police white underneath. Was thinking gun metallic grey to give a more modern look.

    

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