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Plug Peer Review!

  • Thread starter Thread starter Ozmiander
  • Start date Start date
O

Ozmiander

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What do we think?

Just adjusted the valves to .005", dynojet kit on second clip position from bottom, 138 mains, 170 pilot airs, new intake boots, etc.

Shouldn't the porcelain around the center electrode go tan, or is that supposed to be the outside rim which is currently wearing a little antiseize spillover?

Also, is my keeping the crush washer on the plug wrong? I don't want to be accidentally lowering the CR a tiny bit, etc.
 
Hard to tell from the photos but from my experience, it's hard to get a good plug reading until you have a few more miles on the bike. I'd say to let driveability be your judge.
 
I agree with Nessim, but if i had to say, based on those, id say you're a lil lean yet. Especially on that first one. The second one seems to look a lil better, but the pic is darker as well.
 
How's it running? Are these plug reads with the bike coming off idle?
Mark the throttle 1/4 1/2 3/4. Do plug chops with these marks.
 
Ozmiander said:
What do we think?
Click to expand...
We think we need more information. :shock:

If you are riding an 850, you are missing a couple of plugs and the jets are all wrong, but they might be right for your bike.
If you are riding a 450, you have the right number of plugs, but I have not idea if those are the right jets.
In other words, we just have no idea what you're riding.
If you have valves that are adjusted with shims, the .005" is too much. Specs call for .001-.003".

.
 
They're #1 and #4 on my '83 1100E.
Dynojet kit with 138 mains, needles on second position from bottom, 170 pilot airs and k&n pods/v&h megaphone. The bike starts on the first crank with full choke and goes like a demon. But then again my only other bike was a '75 GT380..
 
Are these numbers for the jets in a CV or VM carb? I just installed a Dynojet kit in my 1979 GS 1000's VM 26s. The main jet was 138, the needles replaced with the Dynojet needles, and a tech services guy at Dyno said to keep the 15 pilot jets that are stock. This is with a 4-1 and K&N pods. When I see numbers like 150 or 170 for the pilot jets, I'm a little perplexed.
 
jknappsax said:
Are these numbers for the jets in a CV or VM carb? I just installed a Dynojet kit in my 1979 GS 1000's VM 26s. The main jet was 138, the needles replaced with the Dynojet needles, and a tech services guy at Dyno said to keep the 15 pilot jets that are stock. This is with a 4-1 and K&N pods. When I see numbers like 150 or 170 for the pilot jets, I'm a little perplexed.
Click to expand...

It's CV. 170s are just one step down from stock 180s.
 
That makes it a little clearer; it's just the order of magnitude between my pilot jets being 15, and the CVs using 170s seems a lot, but the CV carbs use much larger throat sizes that the VMs too.
 
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