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604 plug condition; what do you think
Topic Started: Nov 2 2016, 11:35 AM (278 Views)
housewinnie
Knight
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Hi guys,

Went out for a blast yesterday and she ran really well, been faffing with the carb set up jets etc at the moment i have a 185 main and 45 idle, was thinking that the plug looked a little pale and was gonna up the main to a 190 any thoughts.

Pic of plug colour.

I know I is becoming a pain in the **** but need all the help I can get

Cheers again

Mark[IMG][URL=http://s347.photobucket.com/user/housewinniehousewinnie/media/DSCF0196_zpszxyqbqgb.jpg.html]Posted Image[/URL][/IMG]
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vinny900
Marquess
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Was that a proper plug chop, or just what the plug looked liked when you stopped and took it out. Proper plug job to check for main jet would be full throttle, then kill engine and coast to a stop with clutch in - so that you can see what colour the plug was when the main jet was supplying fuel.

Otherwise its just what was happening just before you switched off the engine, so if it was lean it could be lean idle. But it looks pretty normal to me. If it seems to start and run fine, and holds a steady throttle without lurching or hunting, and picks up without hesitation when you open the throttle, then I would say just ride it.

As the weather gets colder you could unscrew the mixture screw by a 1/4 turn to richen up the idle mixture a bit, and then run the bike as you have done and have a look at the plug, which should look about the same, but maybe slightly browner.

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vinny900
Marquess
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PS your previous post stated that the mixture screw was only 1/2 turn out, which is probably too little if you have the right sized idle jet fitted. So if this is the case, try it 1 full turn out at least. This screw ONLY controls the amount of mixture for idle.
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