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Re: what spark plug for yz 125?
Hey Ryan, I gotta say "told you so" on the trannie fluid. Go with NGK BR9ES. That is the plug that came in the bike when it was new. As to the clutch plates, you probably can't find just the friction plates. Clutch plates normally come in sets, < pressure plates / friction plates >. If you can find just the friction plates then go for it.
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When you say "main clutch casing" do you mean the right side cover for the gearbox or do you mean the primary driven gear (AKA "clutch basket") that the clutch boss (AKA "clutch hub") and all the clutch plates fit into?
If you mean the right outer casing > they are slightly different, '97 pn 4JY-15431-10-00 and 2001 pn 4JY-15431-12-00. The entire clutch is the same from 1997 through 2001.
The problem did not start untill the 10w30 Honda transmission oil went in. It isn't the 10w30 thats the problem. It's the TRANSMISSION oil as opposed to MOTOR oil. There is a difference. As I said before, the swelling may or may not go away.
Lose the Honda transmission oil. It may have swollen the cork on the friction plates. Go with 10w40 in the gearbox. Any major brand; Mobil, Shell, Quaker State, Pennzoil, etc.. Try the new oil and give the cork a week to shrink back down > if they will. You may need to put in a new set of plates.
Couple things- 1. If the plug was dirty after 1/2 hour you have either the wrong heat range plug(too cold) or 2. a fuel/carb issue. Buy a hotter NGK plug, ask for help the numbers don't always make sense. Use only full synthetic 2 stroke (I always liked bel-ray) and fresh 93 octane fuel. When you find a plug that works good buy a case of them, 2 stokes will foul plugs period. And some advice with your solution, never head into the woods without a spare plug, they will foul at the absolute worst time.
have a look in the owners manual or i a workshop manual and somewere in there it will tell u the best plugs that should be put in the bike. if it continues in my experiences burnt out plugs means the engine is running to hot which means it is iver fuelling. if this is the case try turning the mixture screw down half a turn