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 Low on power, pulled the plugs...

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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

Low on power, pulled the plugs... Empty
PostSubject: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sun Mar 24, 2019 2:17 pm

Hey there..still pretty new to figuring things out as my 2007 GRiSO gets slowly sorted out cosmetically and mechanically with help from GuzziSteve, Youtube and this forum.

Several weeks ago, on a trip home, the bike was sputtering and massive loss of power, so I went to work. I pulled the plugs and gave them a look as I checked and adjusted the valves.
I could tell (via my TDC chopstick there was a decent amount of soot on the cylinder head and both plugs (that I have very few miles on) were pretty dark.
Valves adjusted to spec, cleaning the plugs and poured in some Seafoam with a fresh tank to trouble shoot.
Ran fine around the neighborhood...but yesterday, I went into the mountains north of me ..seemed fine but power output on the way home was strange.
The bike had no toque...I could eventually make it to the speed I needed, but it took forever to get there...and by the time I got home it was really bad, but idled just perfect.

So today I pulled the plugs again and took pics.

[You must be registered and logged in to see this image.]

Right cylinder had pretty wet threads also.
[You must be registered and logged in to see this image.]

I am not sure where to start actually and have begun searching for possible fixes to what may be a fueling rich issue?
Any advice from the GRiSO Sages?


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Bulldog9
Tiradritto
Tiradritto
Bulldog9

Posts : 300
Join date : 2016-05-14

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sun Mar 24, 2019 3:15 pm

Check your coil connections to the right cool. Power, ground, and both ends of the plug wire. Looks like weak spark, probably the plug cap.
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GuzziSteve
Fra Cristoforo
Fra Cristoforo
GuzziSteve

Posts : 200
Join date : 2016-04-14

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Mar 25, 2019 7:18 am

Did you figure it out James? Spark plug wires do pullout of coils once in a while. They also short out too.
I would do normal checks, air, fuel, compression. I'm still available anytime. You could also see if anything shows up in the dash, maybe it threw a code. Just go t menu and then diagnostics put in the # on top of this site & check it out.
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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Mar 25, 2019 7:55 am

GuzziSteve wrote:
Did you figure it out James? Spark plug wires do pullout of coils once in a while. They also short out too.
I would do normal checks, air, fuel, compression. I'm still available anytime. You could also see if anything shows up in the dash, maybe it threw a code. Just go t menu and then diagnostics put in the # on top of this site & check it out.
Thanks Steve! I will check to see if the connections are solid at the coil and check codes when I get home. I did order a new coil and plug wires just to eliminate the chances it is that as well as put more new bits on this once neglected machine.

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cognosticator
Biondino
Biondino
cognosticator

Posts : 281
Join date : 2016-09-09
Age : 69

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Mar 25, 2019 11:35 am

James, good to meet you this past Saturday at TWoS. Sorry to hear about your problem getting home. I hope the new coil and wire gets it straigtened out.
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kiwi dave
Biondino
Biondino
kiwi dave

Posts : 287
Join date : 2014-04-23
Age : 71

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Mar 25, 2019 12:13 pm

Have you checked the spark plug gaps? I might be getting fooled, but those gaps in your photos look rather large.
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eeyore
Tanabuso
Tanabuso
eeyore

Posts : 95
Join date : 2016-09-09

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Wed Mar 27, 2019 11:15 am

I would put money on coil, lead or cap tracking to earth.
Once you get this fixed you may need to check your throttle bodies are clean and change the oil as it will probably be contaminated with fuel.
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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sat Mar 30, 2019 3:55 pm

cognosticator wrote:
James, good to meet you this past Saturday at TWoS.  Sorry to hear about your problem getting home.  I hope the new coil and wire gets it straigtened out.

Great meeting you too! I had a good time hanging out with you there...let me know the next time you roll up there!
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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sat Mar 30, 2019 4:10 pm

Ok, had time to do some things to the bike today and run around on it a bit, including some highway time to really put some fuel through it.
I changed out the coil with a brand new unit. I replaced the out plug wire with a used spare I had.
I also replaced both outer plugs with the original spec ones, NGK BPR6ES. (Those are the ones that go outside, right?!) I have not checked the PMR8Bs that I have behind the frame.
The bike was fine for a bit (with a lot of burbling but not outright popping on deceleration) and still pulled fine...but on the way home the issues were very noticeable. A lot of hesitation and surging around the cruising area of 4k rpms and 5k rpms. No more burbling when off the throttle but it felt like it was missing any power if i wound the throttle far back...then more and more stumble..but idles just fine.
No codes are shown..and the only thing added was a new wire harness...and that was gone over pretty intensely before putting the bike back together.
I have not pulled the plugs yet (just got home) but I will later to see just how black they are.
Next steps?
Pull the injector on that side and examine?

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bahamazoo
Don Abbondio
Don Abbondio
bahamazoo

Posts : 751
Join date : 2015-08-09
Age : 54

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sat Mar 30, 2019 7:37 pm

I recently 'over cleaned' my inlet manifolds without removing the injectors, and deposited a big lump of crap across one nozzle...
remove the lead (careful with the metal spring clip, it will disappear into the garage somewhere) and allen screw and wriggle/pull the injector out -its kinda held in by an o-ring.
sometímes its the simple things....
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beetle
GRiSO
GRiSO
beetle

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sat Mar 30, 2019 7:45 pm


Er...Pat, you know you only have to depress the spring clip on the injector?

Razz


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GuzziSteve
Fra Cristoforo
Fra Cristoforo
GuzziSteve

Posts : 200
Join date : 2016-04-14

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sat Mar 30, 2019 7:45 pm

I can swing over tomorrow and hook it up to the laptop! I wonder if it's something w/fuel pump or tank swap. I'll call in the morning.
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bahamazoo
Don Abbondio
Don Abbondio
bahamazoo

Posts : 751
Join date : 2015-08-09
Age : 54

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sat Mar 30, 2019 7:47 pm

it was already appeared quite sad I think Beetle, so I tickled it instead, hoping to release some tension and angst Laughing
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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Sun Mar 31, 2019 5:48 am

GuzziSteve wrote:
I can swing over tomorrow and hook it up to the laptop! I wonder if it's something w/fuel pump or tank swap. I'll call in the morning.
Sounds good Steve, thanks!
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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Apr 01, 2019 4:02 pm

This is that right side after about 15 - 20 miles on a new plug
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and this is the left
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I didn't pull the tank and check the inner plugs though.
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GuzziSteve
Fra Cristoforo
Fra Cristoforo
GuzziSteve

Posts : 200
Join date : 2016-04-14

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Apr 01, 2019 5:17 pm

Do you have a compression check gauge?
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burntclutch
Montanarolo
Montanarolo
burntclutch

Posts : 16
Join date : 2018-11-18

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Apr 01, 2019 5:27 pm

GuzziSteve wrote:
Do you have a compression check gauge?

I don't have one of those handy. If I went to get one, any suggestions?
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sideshowbob
Sfregiato
Sfregiato
sideshowbob

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Age : 64

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PostSubject: Re: Low on power, pulled the plugs...   Low on power, pulled the plugs... Icon_minitime1Mon Apr 01, 2019 7:37 pm

Many of the parts stores will loan you one. Remove plugs, hold throttle wide open, both sides should be close to the same.
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