I have a 2002 yz 85 and I keep fouling spark plugs. I have to replace the spark plug almost every time i go riding. I've been mixing the gas on a 32/1 ratio. I was using mixing yamalube oil with the gas, but a friend recommended i use chevron oil with the gas because it burns cleaner. I am wondering if anyone could tell me if there was any reason i might be fouling spark plugs so often.
2007-09-10 14:00:06 · 9 answers · asked by Anonymous in Cars & Transportation ➔ Motorcycles
The main reason a 2 stroke would start fouling plugs would be from a worn out top end - cylinder, piston & rings.
Not enough compression to fully burn the oil in the pre-mix.
Continue using the Yamalube - that's the best stuff for your engine.
A dirty air cleaner will cause it to run rich and foul plugs.
Top ends have to be rebuilt every year or two on 2 stroke engines.
It might be time for yours.
2007-09-10 14:44:25 · answer #1 · answered by guardrailjim 7 · 2⤊ 0⤋
2002 Yz 85
2016-10-15 06:01:25 · answer #2 · answered by Anonymous · 0⤊ 0⤋
what guardrailjim said...
might be time for a new top end. run a compression check on your bike and see if it runs out above about 135psi.... if much less than that, probably time for a piston / ring...
yamalube is probably about as good of a oil for your specific bike, I prefer running Golden Spectro which is a premium synthetic blend and I mix mine at 50:1 for general riding, but 40:1 when hitting the MX track where higher RPMs general happen...
a one range hotter plug would be okay but you have the possibility of running too hot and damaging the top end... I have seen pistons with holes burned in them from a too hot plug...
2007-09-11 03:42:11 · answer #3 · answered by pmk 6 · 0⤊ 0⤋
i'd stay away from that chevron oil, as far as i know there not really known for there 2-stroke oil (not saying its inferior).
stick to the company oil or go synthetic like MC-1.
>stick with yamahas reccomendation for mixing dilution ratios
>as for the fouling id go over the bike..........clean/oil the air filter, clean the carbuerator, do a compression check,
>also the carb may be out of adjustment, if the air fuel mixture is wrong................thats y ur fouling plugs.
2007-09-12 15:03:49 · answer #4 · answered by Subconscious point of view 2 · 0⤊ 0⤋
simple dude very simple 2 strokes are fun but i had the same problem and fixed it easy. 2 strokes have the tendency to not burn the fuel all the way so when your riding make sure you keep giving it throttle not constant but give it zips because giving it those zips will burn the fuel all the way and another reason you might foul plugs is if your bogging it like having it to low of rpms to long that's why you have to keep zipping it. you should try mixing it 30:1 because 32:1 is way to rich and mabye even thiner yet any other questions i can gladly help big_dkozelka@yahoo.com
2007-09-10 14:57:13 · answer #5 · answered by derek k 1 · 0⤊ 0⤋
Unless the chevron oil is 2-stroke oil that is the problem or your air cleaner is letting in dirt and what guardrail said.
2007-09-10 19:00:05 · answer #6 · answered by (A) 7 · 0⤊ 0⤋
mix the gas a little stronger, all it will do is smoke a little more. and run the hell out of the bike to blow the carbon out. dont just putt around on it. i would use NGK spark plug number B8ES
2007-09-13 18:23:26 · answer #7 · answered by jrg83 1 · 0⤊ 0⤋
You may need a hotter plug , talk to the guys at the bike shop
2007-09-10 14:18:17 · answer #8 · answered by Anonymous · 0⤊ 0⤋
It may not be that your gas/oil mixture is too rich, but your carb mixture. Lean out the carburetor, with the same fuel mix, and see how that works.
2016-05-21 11:33:15 · answer #9 · answered by ollie 2 · 0⤊ 1⤋