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Plug chop advice / reading for WOT

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Guest

Guest
Yes, another plug chop thread. I'm a masochist, and my GS650G has 4-into-1 exhaust, K&N "lunchbox" filters (dual filter), and a Dynojet jet kit. Currently DJ160 mains (the largest that come with the kit), unknown clip position (rebuilt these a long time ago and didn't take notes), and pilots 2.25 turns out. I will be attempting velocity stacks later for the hell of it (please, I don't need warnings about them being bad for my engine), but that's for another time.

I attempted two WOT plug chops. Distance is short of 3/4 of a mile. The first chop was on cylinder #4, I ran high RPM WOT in every gear, which meant that I got up there in speed. Second chop was on cylinder #1, I banged through the gears as fast as possible until 5th, WOT the whole time. Bike was warmed up, swapped in a brand new plug, did the run, clutch in, killed ignition, swapped old plug back in for the ride home.

Here are the plugs...

IMG_20160720_105254_zpszidzdoqp.jpg


They are just barely starting to get any color.

Was it not a long enough run? Or is it really that lean? Any advice? Go easy on me...
 
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I've never seen a plug like that. What did you do to them?! But yes, they look like brand new plugs to me.

What do you mean you did one chop on cylinder 4 and a second chop on cylinder 1??
 
I just chopped the threads to see the base of the porcelain. The first run I did was with a new plug on cylinder 4. The second run I did a few weeks later I tried it on cylinder 1 instead.
 
Re: plug chop advice...

Re: plug chop advice...

LOL, nice troll!

Took a look at your build thread. Looks like you know what you are doing. Very nice!

JonnyC said:
I just chopped the threads to see the base of the porcelain. The first run I did was with a new plug on cylinder 4. The second run I did a few weeks later I tried it on cylinder 1 instead.
Click to expand...
 
mnferwerda said:
LOL, nice troll!

Took a look at your build thread. Looks like you know what you are doing. Very nice!
Click to expand...

Hmm? This is actually a serious question. Maybe I just fake like I know what I'm doing?

I've read a ton of info online about plug chops. Some say you only need to do a quick WOT run in one gear. Some say you need to get into top gear and do a run for 30 seconds+, uphill, maybe even dragging the brake. Some described even pulling plug wires and just running it on one cylinder, WOT, while the bike is parked.

Anyways, with 160 mains I fully expected rich readings WOT. I'm just wondering if these really do indicate lean, or if I'm just not running the bike WOT for long enough.
 
hannibal said:
I've never seen a plug like that. What did you do to them?! But yes, they look like brand new plugs to me.

What do you mean you did one chop on cylinder 4 and a second chop on cylinder 1??
Click to expand...

Looks like he literally "chopped" them.
 
Ha, I get it. Looks like I just "chopped" brand new plugs and was asking why it didn't work.

But seriously... :)
 
I think leaving the plug intact would give more surface to evaluate the condition. And studying all four cylinders would be good too.
 
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Chef Bill is good with jetting. You might want to PM him for advice.
 
plug chopping

plug chopping

Seems like I was mistaken. I've never seen photos of plugs actually cut. I thought "chop" meant cutting the power to the engine at WOT.

See, you do know what you are doing... and I keep learning new stuff at this site.

JonnyC said:
Hmm? This is actually a serious question. Maybe I just fake like I know what I'm doing?

I've read a ton of info online about plug chops. Some say you only need to do a quick WOT run in one gear. Some say you need to get into top gear and do a run for 30 seconds+, uphill, maybe even dragging the brake. Some described even pulling plug wires and just running it on one cylinder, WOT, while the bike is parked.

Anyways, with 160 mains I fully expected rich readings WOT. I'm just wondering if these really do indicate lean, or if I'm just not running the bike WOT for long enough.
Click to expand...
 
I've never seen that either. I just assumed he was kidding. I will be watching the thread cause I'll need to do plug chops soon too.
 
I've been dealing with this myself...
It was not run long enough. even if it was extremely too lean, you'd have a permanent discoloration of your spark plug tips vs just being able lightly wire brush the carbon off.
If you're just doing a chop for sizing your mains, do your second method of going through the gears quickly WOT until you get to 4th and continue to redline and kill the engine. going WOT in high RPM in 5th for a mile is tough without breaking some laws.
It'd also help if you were going uphill, you'd accelerate slower and puts extra load on the engine.


BTW - I ended up with DJ126 mains with mac 4-1 and KN dual pod filters. The dynojet stage 3 kit comes with DJ155 and 160. WAYYYYY too big for my mild setup...
 
Thanks ddlaz!

But 126 mains!!?? BS32SS carbs, right? I have the Mac 4-1 with Delkevic muffler and baffle removed, and the dual pod filters, but stock internals. How could the jet sizing have been that much different from what DJ recommends? Did you do all of the steps that the DJ kit specifies, including using their needles?

As for the run being short, I don't see how I could do a longer run especially with staying in 4th. Maybe I have to make multiple runs back and forth?
 
Yes, BS32SS carbs. Even the GS750E stage 3 kit comes with only 124 and 130 mains -- albeit different motor, I believe it's still a bs32ss carb. Yes I did do all of the steps - slide hole drilling, air correctors, needle and clips. I had velocity stacks and it ran ok, very rich but it had a weird bogging at cruising speed/rpm. Took off the stacks and put on filters but it was severely rich to the point it didn't want to go anywhere. Plugs were sooty. took filters off and it ran great but still rich on the top end.

You are free to do it in 5th but you'll probably be running 90+ mph on flat land before you get some color. I just don't want to be blamed for your speeding ticket. Key is to ride WOT in the higher RPMs. I checked google earth for a long straightaway then did an elevation profile check on it to find one with a slope.

Also, the porcelain may need to get warmed up a little before being able to take on color. I like to warm it up by riding around spiritedly for a couple minutes.

Give it a shot and let me know how you fair.
 
It runs OK. No dead spots, but it does feel slow. Of course I don't have another 650 to compare it to, and I never rode the bike stock.

I'm going to try and get some more plug readings.
 
Not sure about anyone else, but I noticed that the article was at kawtriple.com.

I am sure the principle is the same, but I wonder if 2-strokes color the plugs a bit differently than 4-strokes. :-k

.
 
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