Running Rich? Oil filler cap removed = runs better

[jjs1234]

Well I believe I fixed the problem...

Guess what it was [emoji23]













Injectors (4 hole injectors that other people have used here).

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[The Mighty Gryphon]

So you installed the old injectors and everything is just peachy now?

[jjs1234]

So you installed the old injectors and everything is just peachy now?

Yes. Absolutely. (Apart from some intermittent fasting nocking noise on the right-side of the bike that came and went during the ride)

When I open the oil fill... It almost dies. And the rpms barely change upward when the starter button is pressed under 1000rpm. It also does not lag under WOT.

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[Martin]

 :2thumbup: Good to see it's fixed. Did you ever have it running properly with the 4 hole injectors? Were they new? What model vehicle were they originally made for? I nearly bought a set of 4 hole injectors. But due to the lack of solid evidence like Dyno figure comparisons of 4 hole versus a set of clean good condition OEM injectors I resisted the urge. Instead I built a test rig and bought a injector pulse unit. After cleaning my old injectors and getting the spray pattern right I experienced a noticeable difference and also it cured the last little bit of back firing on over run. I concluded that until dyno figures are produced there is no benefit to be gained with 4 hole versus CLEAN OEM. And as Gryph has pointed out the 4 smaller holes would be more susceptible to blocking.
Regards Martin.

[jjs1234]

:2thumbup: Good to see it's fixed. Did you ever have it running properly with the 4 hole injectors? Were they new? What model vehicle were they originally made for? I nearly bought a set of 4 hole injectors. But due to the lack of solid evidence like Dyno figure comparisons of 4 hole versus a set of clean good condition OEM injectors I resisted the urge. Instead I built a test rig and bought a injector pulse unit. After cleaning my old injectors and getting the spray pattern right I experienced a noticeable difference and also it cured the last little bit of back firing on over run. I concluded that until dyno figures are produced there is no benefit to be gained with 4 hole versus CLEAN OEM. And as Gryph has pointed out the 4 smaller holes would be more susceptible to blocking.
Regards Martin.

Never got it working with the 4 hole. Maybe the later model Ks can adjust to compensate for more fuel? I have no idea what model BMW they were for... But it was from a BMW sedan. Someone on the forum said they were better (infact more than just 1 person)- theirs a post on here somewhere.

I think the 4 hole spray 20% more fuel or more.

But she ran like a champ and acceleration was amazing.

Just gotta figure out that intermittent nocking noise...wtf [emoji53]

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[Martin]

Virtually most of the time the 4 hole injectors are used it would to be to replace old possibly partially blocked injectors. And by replacing them with clean 4 hole injectors with the correct spray pattern of course you are going to feel an improvement. Maybe 4 hole injectors are better but I have never seen a proper objective comparison one way or the other. All  4 hole testing including mine was done with a Butt Dyno. However my injectors had a couple of bad patterns and once spraying correctly you could feel a noticeable difference. If I had replaced them without checking them with the 4 hole ones I too would be singing the praises of 4 hole injectors.
 Regards Martin.