My turn for carb problems

[richyrd5]

hmm,would defo get rid of them gold needles chap,,i also think it looks like a bit of oil in the exhaust/over your back end,but plug doesnt look to be oiled up?but certaunly rich,try stock needles and go for the jets you have mentioned..good luck and let us know how you get on..

[vfrman]

Take a look at the front plugs...

ImageUploadedByTapatalk1435362302.594345.jpg

And this is the right rear plug...

ImageUploadedByTapatalk1435362438.477072.jpg

So, jetting is on hold until I can get a compression tester on the motor to see why these plugs are so oiled up.

[vfrman]

Weird. Tapatalk switched the pics. The two plugs are the front and the single is the rear...no 3 cyl.

[vfrman]

And props to my helper...

ImageUploadedByTapatalk1435363129.371988.jpg

ImageUploadedByTapatalk1435363175.807776.jpg

[Neosophist]

interesting.

there doesn't seem to be any oil on the acual electrode, since they are deep recessed plugs oil vapour and crap often settles in the plug holes and shows up like that.

wire brush the shit out of them before you get them back in so you can see if its still sooting up.

[vfrman]

Update...
I put the stock needles back in, with the 0.5mm washer and real Keihin 108f/110r main jets. I also replaced the diaphragms on the slides with this:
http://jbmindustries.com/K-72-S.html

Without riding the bike, all I can say for now is it revs much better in neutral, blasting right through the rev range where it used to bog down at the 5k transition. The exhaust is also much cleaner, with no more black juice flying out. LOL.

I'll have more to report after the track day tomorrow.

I also put a compression tester on using a 8mm adapter a friend made for me. The results were puzzling. I had only 95 psi in 3 cylinders and 85 psi in the fourth. I don't know how the compression could be so equally low and how the bike pulled almost 55 hp on the dyno if the compression was half of what it is supposed to be. Perhaps the gauge isn't accurate or there is something going on with the adapter.

[micpec]

Good to see progress with going back to more standard settings.

What fuel RON octane are you using? Since you are riding the bike at height above sea level.

[vfrman]

Yeah...No idea really. We don't use RON in the colonies. And since we LOVE putting Ethanol into our fuel, I have to search out the Ethanol free stuff. It is 88 Octane, but I add a booster to hopefully bring it up to 93, which I THINK would be about 96 RON.

[vfrman]

Oh, and I tried the compression tester again with the engine hot and a different o-ring to seal it better. The numbers jumped to 105 PSI on all 4 cylinders. I'm writing this off as a bad gauge and moving on. It is highly unlikely that all 4 cylinders are worn to give the exact same low compression reading.

[Neosophist]

if you got the same reading on all 4 does stand a chance your gague is giving low readins.

hows it run on the trackday?