Author Topic: How to unstuck a stuck fuel injectors  (Read 502 times)

Offline TommyT

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How to unstuck a stuck fuel injectors
« on: September 06, 2019, 08:26:50 PM »
Any suggsstions? I have a K75 project bike that sat for who knows how long. I pulled the injectors to test them with current across the electrical connectors and hear no "click". I have tried soaking  them in vinegar for a couple days, and even tried soaking them in hot vinegar thinking that might loosen them up. Before I throw them away I just wanted to ask if anyone here had any suggestions on what else to try to free up the stuck injectors.
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline Scott_

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Re: How to unstuck a stuck fuel injectors
« Reply #1 on: September 06, 2019, 08:59:25 PM »
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Online Martin

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Re: How to unstuck a stuck fuel injectors
« Reply #2 on: September 06, 2019, 10:09:31 PM »
Try soaking for 15 min I lacquer thinners I have my own cleaner tester and used to use injector cleaner. I was talking to the guy at the place where I get "O" rings and injectors parts. He asked me what I was using to clean them and when I said injector cleaner he said it's too dear and that they use lacquer thinners. It might work better if you remove the filter screens, this will allow the cleaner to get right in. A brief application of a 9v battery on and off helps but unless you want a fireball no flames and no sparks.  A mate gave me a set of deemed unsalvageable injectors which had been soaked in injector cleaner to no avail, lacquer thinners cleaned them up.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.
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Offline mlytle

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  • alexandria, va
  • 92 K75s, 94 K75s, 96 K1100RS SE (custodian), 09 K1300s
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Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline johnny

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Re: How to unstuck a stuck fuel injectors
« Reply #4 on: September 07, 2019, 09:52:52 AM »
greetings...

the russ collins crew can fondle my injectors anytime they wish... i didnt know of their injector operation... good to know...

this is russ collins of rc fuel injection... can you give me a yeeeeehaaaaaa...


* rc1.jpg (70.57 kB . 768x576 - viewed 124 times)

j o
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Offline mlytle

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Re: How to unstuck a stuck fuel injectors
« Reply #5 on: September 07, 2019, 08:54:51 PM »
yeeeeeeehaaaaaaaa!

i started using RC for my race car injectors 15+ years ago.  lost track of how many sets they have done for me since!
  • alexandria, va
  • 92 K75s, 94 K75s, 96 K1100RS SE (custodian), 09 K1300s
Marshall
Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html
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Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #6 on: September 08, 2019, 12:50:48 PM »
http://www.mrinjector.us/
Thanks, I have read good things about him, but I am worried that these injectors would be DOA at Mr. injector. Maybe I should call him and see what he would charge if he can't get them to work.
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #7 on: September 08, 2019, 01:02:21 PM »
Try soaking for 15 min I lacquer thinners I have my own cleaner tester and used to use injector cleaner. I was talking to the guy at the place where I get "O" rings and injectors parts. He asked me what I was using to clean them and when I said injector cleaner he said it's too dear and that they use lacquer thinners. It might work better if you remove the filter screens, this will allow the cleaner to get right in. A brief application of a 9v battery on and off helps but unless you want a fireball no flames and no sparks.  A mate gave me a set of deemed unsalvageable injectors which had been soaked in injector cleaner to no avail, lacquer thinners cleaned them up.
Regards Martin.
Okay I tried one , soaked it for about 20 minutes, tried a 9 volt and I just got no click. Will try again later and i will try soaking a different one.
  • Olive NY
  • 1990 K75s, 1990 K75RT

Online Martin

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Re: How to unstuck a stuck fuel injectors
« Reply #8 on: September 08, 2019, 04:20:08 PM »
Did you remove the injector filter screens??
Regards Martin
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline Laitch

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Re: How to unstuck a stuck fuel injectors
« Reply #9 on: September 08, 2019, 05:11:28 PM »
Maybe I should call him and see what he would charge if he can't get them to work.
I believe that is important for you to do. He provides a service for testing and cleaning injectors. I'd expect to pay for that service to each injector regardless of its outcome. His warranty states no allowance will be made for labor in the case of mechanical faults.
  • Along the Ridley in Vermont.
  • 1995 K75 72,000 miles
I wept because I had no radials until I met a man who had no splines.
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Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #10 on: September 08, 2019, 09:12:43 PM »
Did you remove the injector filter screens??
Regards Martin
Well I looked at the top of the injector and could not figure how to do that, help please?
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #11 on: September 08, 2019, 09:18:20 PM »
I believe that is important for you to do. He provides a service for testing and cleaning injectors. I'd expect to pay for that service to each injector regardless of its outcome. His warranty states no allowance will be made for labor in the case of mechanical faults.
Agree, I guess was going to ask if he looked at them before starting and said "Gee these are real junk, I can't help." that I would not have to pay return shipping. Maybe I will send him one and see what happens. I guess his report can tell me if it is junk and then I should not brother sending him the other two.
  • Olive NY
  • 1990 K75s, 1990 K75RT
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Online Martin

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Re: How to unstuck a stuck fuel injectors
« Reply #12 on: September 08, 2019, 11:21:19 PM »
They are removed by screwing in a self taping screw of the appropriate diameter, then pull out the screen with a pair of vice grips or pliers. You can clamp the injector in a vice fitted with soft jaws if needed. You will need to get new replacement screens. If you have access to a sonic jewellery cleaner this can help, do not use thinners in it, but you can use vinegar.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #13 on: September 09, 2019, 06:40:34 AM »
They are removed by screwing in a self taping screw of the appropriate diameter, then pull out the screen with a pair of vice grips or pliers. You can clamp the injector in a vice fitted with soft jaws if needed. You will need to get new replacement screens. If you have access to a sonic jewellery cleaner this can help, do not use thinners in it, but you can use vinegar.
Regards Martin.
Thanks for your help. I was just looking up where to get new filters and how much they are when I found this nice video on how to remove and replace the parts on a fuel injector from Mr. Injector. https://www.youtube.com/watch?v=V2sD5UsOnJs&feature=youtu.be

I will try this on one of them after I have a couple of cups of coffee. It's early here now.
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline mlytle

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Re: How to unstuck a stuck fuel injectors
« Reply #14 on: September 09, 2019, 08:43:10 AM »
or...for only about $25 per injector, you can send them to a professional like RC to have them refreshed.  that includes the cleaning, testing, filters, orings, etc.   these things rarely go bad.  they just get clogged/jammed up inside.  professional tools and processes can get them working again.   no at home hack work.  no guess work about if they are working optimally.  turn around time is just a few days.

before


after


just do it.


  • alexandria, va
  • 92 K75s, 94 K75s, 96 K1100RS SE (custodian), 09 K1300s
Marshall
Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline The Mighty Gryphon

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Re: How to unstuck a stuck fuel injectors
« Reply #15 on: September 09, 2019, 09:37:59 AM »
Since I'm not racing my bikes in international GP's, when the latest showed up in the garage with two missing injectors and the other two DOA I decided to try the $10 injectors you can find on eBay.  What the hell, all the damn things are is a friggin' coil, a spring and a needle valve. 

Bike fired up immediately with them, and with fresh fuel and a bit of throttle balancing idles and runs beautifully.

These are the ones I got:
https://www.ebay.com/itm/Set-of-4-Fuel-injectors-Fits-BMW-K100-RS-RT-LT-2-Valve-Engines-Motorcycle/132334916168?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
  • In my garage in Marilla, NY
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Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #16 on: September 09, 2019, 12:48:23 PM »
Since I'm not racing my bikes in international GP's, when the latest showed up in the garage with two missing injectors and the other two DOA I decided to try the $10 injectors you can find on eBay.  What the hell, all the damn things are is a friggin' coil, a spring and a needle valve. 

Bike fired up immediately with them, and with fresh fuel and a bit of throttle balancing idles and runs beautifully.

These are the ones I got:
https://www.ebay.com/itm/Set-of-4-Fuel-injectors-Fits-BMW-K100-RS-RT-LT-2-Valve-Engines-Motorcycle/132334916168?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Thanks, but I am confused. You got 4 for $40 or each one is $40? Some of the other ebay injectors are going for about $40 each. They do listed them funny, so I am wondering.
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #17 on: September 09, 2019, 12:57:38 PM »
Thanks for your help. I was just looking up where to get new filters and how much they are when I found this nice video on how to remove and replace the parts on a fuel injector from Mr. Injector. https://www.youtube.com/watch?v=V2sD5UsOnJs&feature=youtu.be

I will try this on one of them after I have a couple of cups of coffee. It's early here now.
Well I took the screens off all of them and the injectors  look very rusty inside. I let them all soak for 25 minutes, and I tired all with 9 volts and still no click!! I would be happy to send them to a injector cleaner but I think they might be DOA. This bike might have sat for 10 years and it was not running when I got it. The tank had water and gas in it and looked like hell until I clean it. Just to happy to be proven wrong I think I will send one off to see it they are truly DOA.
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline Laitch

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Re: How to unstuck a stuck fuel injectors
« Reply #18 on: September 09, 2019, 03:46:44 PM »
Let us know the outcome and whatever costs you incur by this cautious approach.
  • Along the Ridley in Vermont.
  • 1995 K75 72,000 miles
I wept because I had no radials until I met a man who had no splines.
http://www.motobrick.com/index.php/topic,296.msg53303.html#msg53303

Online Martin

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Re: How to unstuck a stuck fuel injectors
« Reply #19 on: September 09, 2019, 04:25:37 PM »
Fill them with a good quality penetrant (not WD40) immerse the tips in the same penetrant and let them soak for a week or two. Occasionally give them a short zap with the 9v battery. A sonic jewellery would help.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline The Mighty Gryphon

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Re: How to unstuck a stuck fuel injectors
« Reply #20 on: September 09, 2019, 04:32:29 PM »
Thanks, but I am confused. You got 4 for $40 or each one is $40? Some of the other ebay injectors are going for about $40 each. They do listed them funny, so I am wondering.

$10 each, $40 for a set of four.  At that price I can't be bothered with screwing around with bad ones anymore.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE
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Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #21 on: September 10, 2019, 06:27:38 PM »
Let us know the outcome and whatever costs you incur by this cautious approach.
Will do!
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #22 on: September 10, 2019, 06:28:32 PM »
Fill them with a good quality penetrant (not WD40) immerse the tips in the same penetrant and let them soak for a week or two. Occasionally give them a short zap with the 9v battery. A sonic jewellery would help.
Regards Martin.
I have some PB Blaster, will that do ?
  • Olive NY
  • 1990 K75s, 1990 K75RT

Offline alabrew

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Re: How to unstuck a stuck fuel injectors
« Reply #23 on: September 10, 2019, 06:34:45 PM »
When I send the 85s injectors off to Mr. Injector, he returned them with a note that he could not git one of them to spray to his satisfaction and also sent 4 refurbished injectors all for the same price as if only the originals were cleaned cleaned.

Hard to beat the $40 for 4, only one set left!

  • Alabama
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Offline TommyT

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Re: How to unstuck a stuck fuel injectors
« Reply #24 on: September 10, 2019, 06:56:04 PM »
When I send the 85s injectors off to Mr. Injector, he returned them with a note that he could not git one of them to spray to his satisfaction and also sent 4 refurbished injectors all for the same price as if only the originals were cleaned cleaned.

Hard to beat the $40 for 4, only one set left!
Good to know, I have not had the time to call him about mine. So he sent you back other refurbished ones when yours did not work right?
  • Olive NY
  • 1990 K75s, 1990 K75RT

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