MOTOBRICK.COM

TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: enzo on May 17, 2014, 09:28:58 AM

Title: Bosch 4- hole injectors upgrade...Not working
Post by: enzo on May 17, 2014, 09:28:58 AM
I had a spark plug that was black with soot and was suspecting a sticking fuel injector. (1985 K100RS)

In researching injectors I came across the 4-hole Bosch injector part#0280150941 which is suppose to work well. Unfortunately after changing all 4 injectors the bike runs very badly. I pulled the fuel rail and the injectors are all shooting fuel. Put the old injectors back in and bike runs fine.

The injectors I purchased where rebuilt off E bay. Are they bad or just the wrong part?

http://www.ebay.com/itm/121307609451?item=121307609451&viewitem=&sspagename=ADME:L:OU:US:1120&vxp=mtr (http://www.ebay.com/itm/121307609451?item=121307609451&viewitem=&sspagename=ADME:L:OU:US:1120&vxp=mtr)
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: K75RT Keith on May 17, 2014, 09:42:30 AM
Wrong ones.  The ones you want fit the BMW 318i 
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: Scott_ on May 17, 2014, 09:43:22 AM
Why not just send the originals out to be cleaned and serviced....
I can't answer if the e-bay ones you got have the same fuel flow volume rating or not.
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: vintagemilano on May 17, 2014, 10:01:57 AM
Whats the ohm rate and flow ratings of the originals and the ebay ones?
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: enzo on May 17, 2014, 10:02:34 AM
Why not just send the originals out to be cleaned and serviced....
I can't answer if the e-bay ones you got have the same fuel flow volume rating or not.

I had read that the 4-hole injectors made the bike run better. More torque, better fuel economy.
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: mjydrafter on May 18, 2014, 04:17:41 PM
The 0280150941 should be pretty close, but the resistance is lower than the stock 0280150210.

The green ones from a 318 are a 0280150211.  I think that is what most folks are running, that is what I am running.

I tried some 0280155962's but they didn't seem to work right.  I think that my fuel pump may have been failing so I don't know if they were okay or not.  The 962's don't have the slot for the clips used on our bikes, but it shouldn't make than much difference, they didn't leak.  The 962's are the newer style one piece that supposedly don't develop leaks like the larger (our stockers) do.

Witch hunter has great pics and flow rates for fuel injectors  http://www.witchhunter.com/injectordata1.php (http://www.witchhunter.com/injectordata1.php)
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: dougo on June 04, 2014, 08:37:07 PM
The 4 hole injectors I got from eBay worked great but then again I also rebuilt the entire fuel system,around 500 dollars in parts.  Injectors, all fuel lines inside and outside the tank fuel pump and rubber mount, and last but not least the fuel filter. . You can get a full stock fuel replacement kit on line for about 300...
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: TimTyler on June 04, 2014, 09:46:37 PM
Mr. Injector is loved by many. Fast service too. http://www.mrinjector.us/ (http://www.mrinjector.us/)
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: K75RT Keith on June 04, 2014, 10:15:14 PM
+1 on Mr. injector.  Rebuilt off Ebay may have meant new orings
Title: Re: Bosch 4- hole injectors upgrade...Not working
Post by: mystic red on June 05, 2014, 01:52:11 AM
Mr. Injector is a 15 minute ride for me....he's good. Been to his shop....very pro.