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Plug colour

  • Thread starter Thread starter UK-GT
  • Start date Start date
U

UK-GT

Guest
I know its been asked before, do these look like they should. Just come back from a 45mile ride and pulled the plugs:
OhTupLIc.jpg

OACOILGX.jpg
 
A bit LEAN for my tastes. :-\\\

More important would be some specific "plug chops".

Hold a specific throttle position for a while, hit the "kill" switch, pull the clutch, coast to a stop, THEN read the plugs.

The specific throttle settings would be FULL, to read the main jets, HALF, to read the needles and 1/8 to 1/4 to read the pilots.

.
 
I'm going to disagree with Steve. I think they look just fine.

How does the bike start and respond to you?
 
Assuming they are in order, #3 is the best one, in my book.

Yeah, the others aren't bad, but definitley would not go any leaner.

.
 
They look great, # 3 in my book is actually a little rich.

Ride it.

Cheers
 
If this is a good average burn, # three is about perfect. That is the color of my baffle plate on my 4-1 exhaust which is probably a better overall average indicator of how it is adjusted.
 
I think we can all agree on one thing: you Brits spell "color" funny. :D:D

(Plugs look okay to me.)
 
bbjumper said:
They look great, # 3 in my book is actually a little rich.

Ride it.

Cheers
Click to expand...

Agreed it's a tad rich, #4 is a tad lean but neither are anything to cry home about.

All is good, continue riding, check in when something has gone wrong :D
 
I am out of my comfort zone when it comes to carbs. The bike has a stock airbox (with added draught excluder) and a Motad 4-1. The Intake rubbers (new o-rings) & the rubbers between the airbox and carbs are still 'rubbery'. The carbs have had new o-rings (28 intotal I think).
My initial thought was that 1,2 & 4 were a little 'lean', most of my riding that day was done at about 60mph with some overtaking :-\\\, is it a case of adjusting a screw on each carb by 1/4 turn or am I reading too much into it and should just ride it!! But the last thing I want to do is burn a valve out, the chrome headers are a nice blue colour, but in her defence she has had some enthusiastic riding over the last couple of days :D
The cylinders have recently been honed and pistons re-ringed (comression is about 140psi cold), valves lapped (new valve stem seals) and shims checked (0.06-0.1 exhaust and 0.04 to 0.08 intake).
 
Although you plugs look pretty good after that short ride, I would say that number three looks closer to ideal. Yes, I would unscrew number 1,2 & 4 fuel/air screws out about 1/8 of a turn and, if you have not already done so,
go up 2-3 sizes on the main jets because of your pipe. The U.S. spec models came with 110 mains so I would use either 115's or most likely 117.5 main jets. What main jet size do your Euro spec 650 models come with?
 
Leave the jets alone! It's a Motad.

Colour is fine but if it makes you feel any better tweak the mixture screws associated with the 3 lighter plugs out next to nothing. If anyone riding behind you then complains of smelling petrol you can always wind them in a touch.
 
One of the jobs I need to do is check the head bolts and shims (as it was re-ringed about 500 miles ago - I know I should have done it earlier) so while the tank is off I will adjust the screws a tiny bit, I am also going to install a clear vacuum hose so that I can check the petcock operation.
 
The Motad is designed so that no re-jetting is required, on one of my other posts Steveb922 said "And I also thought that that there was no need to re-jet for a Motad, although I can't claim personal experience." and Chris G said "Had it confirmed by Motad that this was the case, have one fitted on mine, bike came running lean I didn't want to spend an age messing with jets etc if it was anything to do with the exhaust, my problem was valve adjustment, now running sweet."
 
Does it pull to redline without stutter? Does it run hot? Does it hold a nice idle?

If yes, no, yes, I wouldn't mess with her.

Your plugs are nice, and very few headers escape a little discoloring. Ride it.
 
GSX1000E said:
Regardless of the plug and play (supposed) nature of the beast, again, I would increase the main jets if it were my bike.
Click to expand...

Well that would be your choice and you would be wrong. Put bigger jets in when fitting a Motad and she'll start farting in in no time.
 
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