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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: TommyT on September 06, 2019, 08:26:50 PM

Title: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: Scott_ on September 06, 2019, 08:59:25 PM
http://www.mrinjector.us/
Title: Re: How to unstuck a stuck fuel injectors
Post by: Martin 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: K1300S on September 07, 2019, 09:39:16 AM
http://www.mrinjector.us/

https://www.rcfuelinjection.com/Store/c/fuel-injector-cleaning

I send all my injectors to RC.  car and bike.

Title: Re: How to unstuck a stuck fuel injectors
Post by: johnny 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 717 times)

j o
Title: Re: How to unstuck a stuck fuel injectors
Post by: K1300S 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!
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: Martin on September 08, 2019, 04:20:08 PM
Did you remove the injector filter screens??
Regards Martin
Title: Re: How to unstuck a stuck fuel injectors
Post by: Laitch 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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?
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: Martin 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: K1300S 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
(https://i397.photobucket.com/albums/pp59/mblytle/K75S%20black/20160109_163925.jpg) (http://s397.photobucket.com/user/mblytle/media/K75S%20black/20160109_163925.jpg.html)

after
(https://i397.photobucket.com/albums/pp59/mblytle/K75S%20black/20160121_191009_edit_1453423103950.jpg) (http://s397.photobucket.com/user/mblytle/media/K75S%20black/20160121_191009_edit_1453423103950.jpg.html)

just do it.


Title: Re: How to unstuck a stuck fuel injectors
Post by: The Mighty Gryphon 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
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: Laitch on September 09, 2019, 03:46:44 PM
Let us know the outcome and whatever costs you incur by this cautious approach.
Title: Re: How to unstuck a stuck fuel injectors
Post by: Martin 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: The Mighty Gryphon 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.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT on September 10, 2019, 06:27:38 PM
Let us know the outcome and whatever costs you incur by this cautious approach.
Will do!
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT 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 ?
Title: Re: How to unstuck a stuck fuel injectors
Post by: alabrew on September 10, 2019, 06:34:45 PM
When I send the ’85’s 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!

Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT on September 10, 2019, 06:56:04 PM
When I send the ’85’s 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?
Title: Re: How to unstuck a stuck fuel injectors
Post by: Martin on September 10, 2019, 10:20:16 PM
If the PB doesn't work time to move on and replace. I've got access to a bit more equipment. I did however turn the lid on my wife's sonic jewellery cleaner to try and regress into primordial ooze. It did eventually return to a solid state that sort of resembles a lid. Acrylic lacquer thinner fumes plus plastic = ooze.
Regards Martin.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT on September 18, 2019, 09:06:35 AM
Just an update. I talked to Mr. Injector and he agreed that my injectors are probably beyond saving considering the things I have done to unstick them from the rust inside them. I ordered the Chinese injectors from Ebay for a total of $33. I was hoping to give a report of how they ran but when I installed them and turn on the bike I discovered that the bike's injector rail has a pin sized hole in the cap for the injector for cylinder #3, crap. I had cleaned up the what I though was some surface rust inside of the caps but it must have been deeper the just the surface. I am waiting for a new fuel rail to arrive before I can try them out again.

I am not sure how water got so deep into the fuel system, the bike sat for long time, but I would think the water in the gas would have been confined to the gas tank. Unless someone tried to start the bike after the corn gas attracted water  into the tank and then water being heavier then gas got sucked into the injectors and then the bike sat longer after that to start the rusting of injectors. 
Title: Re: How to unstuck a stuck fuel injectors
Post by: Laitch on September 18, 2019, 10:29:10 AM
Unless someone tried to start the bike after the corn gas attracted water  into the tank . . .
Water infiltrated fuel long before the widespread use of ethanol in gasoline. That's why it was recommend to keep fuel tanks topped up in deep winter or in idle vehicles to lessen condensation in fuel tanks. Condensation runs down fuel tank walls then enters the fuel creating multiple problems because water sinks through the fuel to the bottom of the tank and is picked up by the fuel pump. Ethanol combines water with fuel—to a certain extent—so at least water then has a greater chance of leaving the system through combustion. Neglect and idleness are the greatest reasons for component failure, not 10% or less ethanol in fuel.
Title: Re: How to unstuck a stuck fuel injectors
Post by: Martin on September 18, 2019, 05:02:45 PM
Before ethanol laced fuel we used to actually add a cupful of methylated spirits. The methylated spirits would absorb the water allowing it to be burnt off in the combustion chamber.
Regards Martin.
Title: Re: How to unstuck a stuck fuel injectors
Post by: schrocketeer on September 19, 2019, 11:21:24 PM
My 85 k100rt had sat for three years with ethanol included gasoline.

I tried 2 weeks of soaking in Berryman's carb cleaner bucket ($20 from the local auto parts store). No "click" response with 12 Volts across the Leads. Put them back for another week. Still no click. Put them in for a few more days. Happy clicky-opening sounds!

Somewhere else on this forum, there's a list of cars that have compatible o-rings, something like a Chevy Cavalier from the 2000's. Full set for the k100 was less than $4.00.

After I got the fuel tank all cleaned out, and the fuel pump and filter replaced, I connected the fuel injectors in to the rail, but NOT in to the engine. I put a piece of notebook paper under the injectors, then hit the starter. Some nasty orange/brown goo came out right away. Then it started squirting clean gas.

That was 15k miles ago. No fuel issues since.
Title: Re: How to unstuck a stuck fuel injectors
Post by: TommyT on September 20, 2019, 05:21:39 PM
My 85 k100rt had sat for three years with ethanol included gasoline.

I tried 2 weeks of soaking in Berryman's carb cleaner bucket ($20 from the local auto parts store). No "click" response with 12 Volts across the Leads. Put them back for another week. Still no click. Put them in for a few more days. Happy clicky-opening sounds!

Somewhere else on this forum, there's a list of cars that have compatible o-rings, something like a Chevy Cavalier from the 2000's. Full set for the k100 was less than $4.00.

After I got the fuel tank all cleaned out, and the fuel pump and filter replaced, I connected the fuel injectors in to the rail, but NOT in to the engine. I put a piece of notebook paper under the injectors, then hit the starter. Some nasty orange/brown goo came out right away. Then it started squirting clean gas.

That was 15k miles ago. No fuel issues since.
That is encouraging, I am still spraying PB Blaster into them hoping to get the same results that you got. I got a number at NAPA for o rings that will fit and new filters for them. I did use the eBay injectors, but I was concern that when I had to pull off the pin holed fuel rail the plastic tips and filters came off with the stuck upper O rings.  They did go back together okay but I did notice the  use of plastic in them. The bike did start up today, but I ran into another surprising problem with the project bike. That will be posted up in another topic soon.