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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spark Plugs Keep Fouling...
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[QUOTE="killer454, post: 1416665, member: 121317"] what gas you running? my nephews cr125r 2004 ran like crap when we got it back together.kept fouling plugs and boging at lower throttle to mid. now it is running top notch here is what we did to get it to run real good- we bought 1 gallon 110 race fuel we bought 1 gallon 89 oct cheap gas mix 50/50 110 and regular unleaded fuel-runs perfect,use a very good 2-stroke oil. i know his main is back to stock,and the needle is in the stock location to,we put a smaller pilot in i think but it may be at 40 stock i cant remember. the manual for this 2004 cr125r says in big black letters- USE 95 OCTAIN FUEL OR HIGHER we were running cheap 87 or 89 octain from caseys general store and it ran like crap. if you buy the 110 and mix it 50-50 with the cheap crap it will raise the octain rating of the fuel so the bike can run. DONT GO TO THE AUTOMOTIVE PARTS PLACE AND BUY OCTAIN BOOSTER THAT WILL NOT WORK. if you decide to take my advice do like we did,add the 50/50 mix then do a plug chop,if the plug looks on the rich side ride it for 10 min then look at plug again-looks good ride ride ride. nephew has around 25 hours on this mixing on this bike all trail rideing [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spark Plugs Keep Fouling...
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