BMW K bikes (Bricks)

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1Back to top Go down   No start issues  Empty No start issues Tue Jul 07, 2020 9:30 pm

Built4comfort

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I bought this 85 k100rs with it not running. I went to test ride it before purchase and it died as soon as I got out of the driveway. The guy is a friend of mine so I know it ran decently before this. He purchased it not running where the issue was the fuel pump had gone bad. He replaced that and rode it for about a month probably before deciding to sell. Thinking the issue was only power to the fuel injectors and knowing I wanted to turn it into a café racer, I did some research that led me to the m-unit by motogadget. After hours of watching videos and tracing wire diagrams, I got it all wired for the ignition and start bare necessities. I'm pretty green when it comes to all things mechanical and electrical so this was probably too much to tackle but I did it and I can't turn back now. I replaced the injectors themselves from Mr injector. And tested those. Had power. I got everything wired up to test and... Nothing. Just a starter turning. Checked spark. No spark. Check continuity in plug wires. Checked resistance in coils. Everything good except 2&3 gave me high numbers. Replaced spark plugs, it was as simple as that. Gave me spark. However, still no ignition. Now, it was about 4 in the morning and I had to be up at 6 for work so I didn't do the most intelligent thing, but I sprayed starter fluid in the air box. What do you know? It fired up. It didn't stay running. I did get a video. I put new, fresh gas in to make sure that wasn't it. But that is as far as I've gotten and I'm not sure where to go. Does anyone have suggestions? I'll post a video

    

2Back to top Go down   No start issues  Empty Re: No start issues Tue Jul 07, 2020 9:58 pm

Built4comfort

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1985 BMW K100RS - Modded
0042391
    

3Back to top Go down   No start issues  Empty no go Thu Jul 09, 2020 8:32 am

daveyson

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It runs when you supply fuel (starter fluid) looks like the fuel supply isn't working.


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11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

4Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 11:04 am

nino

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Last time with described symptoms on my 1984 K 100 it was faulty temperature sensor. Bike started but only with starter spray then died. After I replaced fuel temp sensor it started normally. Check the connection to fuel temp sensor, clean it and try to start.
Regards

    

5Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 1:08 pm

Built4comfort

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@daveyson wrote:It runs when you supply fuel (starter fluid) looks like the fuel supply isn't working.
I know the pump itself is working. Maybe not pumping enough? I'll check it out! Thanks!


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1985 BMW K100RS - Modded
0042391
    

6Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 1:10 pm

Built4comfort

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@nino wrote:Last time with described symptoms on my 1984 K 100 it was faulty temperature sensor. Bike started but only with starter spray then died. After I replaced fuel temp sensor it started normally. Check the connection to fuel temp sensor, clean it and try to start.
Regards
Oh the fuel temp sensor? Didn't know it had one 😅. Haha I will research, inspect, and let you know my findings!


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1985 BMW K100RS - Modded
0042391
    

7Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 1:28 pm

Built4comfort

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@Built4comfort wrote:
@nino wrote:Last time with described symptoms on my 1984 K 100 it was faulty temperature sensor. Bike started but only with starter spray then died. After I replaced fuel temp sensor it started normally. Check the connection to fuel temp sensor, clean it and try to start.
Regards
Oh the fuel temp sensor? Didn't know it had one 😅. Haha I will research, inspect, and let you know my findings!
Ah! Did some searching on the net just now. Saw a post that you were in, actually! The water coolant temperature sensor! I will check that out later on. 

It is worth noting that when I got the bike, the ground strap looked... Like it had caught fire at some point? I see no damage or marks to indicate the bike had caught on fire but could that be the underlying issue? The sensor might be good but the earth ground for the frame/engine is bad?


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1985 BMW K100RS - Modded
0042391
    

8Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 2:13 pm

mike d

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Have you checked out the trouble shooting guide:

http://www.kforum-tech.com/electrical/EFI/bike-wont-start-EN.htm

Mike

    

9Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 3:14 pm

nino

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If that sensor is out of 12 V no fuel at all. So check the connectivity

    

10Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 8:00 pm

Built4comfort

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@mike d wrote:Have you checked out the trouble shooting guide:

http://www.kforum-tech.com/electrical/EFI/bike-wont-start-EN.htm

Mike
I have not. I'll have to follow those tomorrow. When I go to work on it more. Thank you!!


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1985 BMW K100RS - Modded
0042391
    

11Back to top Go down   No start issues  Empty Re: No start issues Thu Jul 09, 2020 8:01 pm

Built4comfort

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@nino wrote:If that sensor is out of 12 V no fuel at all. So check the connectivity
Will do! Thank you!


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1985 BMW K100RS - Modded
0042391
    

12Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 5:39 am

Built4comfort

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So I have narrowed it to the fuel pump. The coolant sensor was also a problem but I bypassed it for now. I ordered one and it is on the way. I pressure test the fuel delivery system and only got 6psi on the gauge. Me thinks I've found the issue. I'm going to take it apart, clean it, put it back together and see what I get.


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1985 BMW K100RS - Modded
0042391
    

13Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 8:27 am

Built4comfort

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I think I found the culprit. Simply no fuel pressure because of this booger. I suppose I should have checked the fuel pump closely when I first got it. The fuel filter is also toast. So I'm gonna get a new filter and hose tomorrow and give it another shot!
No start issues  4995010


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1985 BMW K100RS - Modded
0042391
    

14Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 9:10 am

Suzi Q

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Make sure to use the correct submersible fuel hose for replacement - it can be quite expensive!


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Sometimes I'm not really Suzi Quatro.
    

15Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 1:06 pm

MartinW

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K75s Hybrid
    

16Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 3:38 pm

Dai

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So that set me off looking for similar products on ebay.uk and Motorworks are still the cheapest!


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1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

17Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 5:41 pm

Built4comfort

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chris846 wrote:Make sure to use the correct submersible fuel hose for replacement - it can be quite expensive!
Yup! Not quite sure what he was thinking. The hose had the biggest kink in it too so he didn't even set it up properly.


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1985 BMW K100RS - Modded
0042391
    

18Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 5:42 pm

Built4comfort

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1985 BMW K100RS - Modded
0042391
    

19Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 5:42 pm

Built4comfort

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@Dai wrote:So that set me off looking for similar products on ebay.uk and Motorworks are still the cheapest!
I'm glad I was able to help!


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1985 BMW K100RS - Modded
0042391
    

20Back to top Go down   No start issues  Empty Re: No start issues Sat Jul 11, 2020 9:23 pm

MartinW

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Bargain a few of us have just purchased Quantum fuel pump mounting kits. The kit consists of the rubber damper the plastic damper mount, filter basket,  flex hose, fuel filter, pump electrical crimp terminals, terminal boots and two cable ties. The whole kit was $55.00 Au shipped even cheaper in the US. A couple of more mates are now wanting to purchase the kits but I can't seem to find them online any more. They have pumps and filter baskets and flex hose in various lengths but no kits that I can find. The part number on the box is HFP-K437. We have fitted one part kit damper, mount and filter basket, the quality seems good and it fitted with no problems. I'll take some pictures later today and do a separate post.
Regards Martin.


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K75s Hybrid
    

21Back to top Go down   No start issues  Empty Re: No start issues Sun Jul 12, 2020 8:44 am

Built4comfort

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@MartinW wrote:Bargain a few of us have just purchased Quantum fuel pump mounting kits. The kit consists of the rubber damper the plastic damper mount, filter basket,  flex hose, fuel filter, pump electrical crimp terminals, terminal boots and two cable ties. The whole kit was $55.00 Au shipped even cheaper in the US. A couple of more mates are now wanting to purchase the kits but I can't seem to find them online any more. They have pumps and filter baskets and flex hose in various lengths but no kits that I can find. The part number on the box is HFP-K437. We have fitted one part kit damper, mount and filter basket, the quality seems good and it fitted with no problems. I'll take some pictures later today and do a separate post.
Regards Martin.
I am going to check this out for sure! For now, I just got some submersible hose and a new fuel filter and that seemed to do the trick! Thanks for all your advice!


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1985 BMW K100RS - Modded
0042391
    

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