Question about 2005 Suzuki RM 125

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2005 RM 85 fouling plugs every ride.

Running 50 to 1 ratio oil mix; Repsol pre mix; bike has lots of power; smoking more than normal; exhaust valve chamber gets black oil build up in it. Product line does not list an RM 85 so it is listed under RM 125.

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Obviously theres way to much oil in the mix. Speak to your local bike shop and ask them on the best mix for the bike

Posted on Nov 28, 2008

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    Mark Jul 29, 2014

    YOUR USING WAY TO MUCH OIL WITH YOUR PREMIX use 32:1 or 30:1 i reccommend 32:1 but 32:1 is 4 ounces of premix two stroke oil per gallon of gas not motor oil well yeah if you want your motor to blow up so use i reccommend TC-W 3 2 stroke premix oil

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Hi my rm like plug i have the bike for 3 weeks and i have had 12 plug in it so far
What is the problem?
It is running at 100 ml of 5 lites

Posted on Sep 24, 2011

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You need to be using a 32/1 mix with the oil.

Posted on Apr 15, 2009

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Hi mate you should do the ratio 32/1 or 40/1 use silkolene comp 2 premix descent stuff i always use it good luck

Posted on Apr 03, 2009

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Try using AMS oil. its the only oil i ever run in my 2 strokes.

Posted on Jan 12, 2009

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1 Answer

What motor oil do i use for my 2005 CR125 honda


You need to use a 2 stroke motor oil. Look for oils that say 2 stroke motorcycle oil, injector oil or smokeless. Do not use a standard automotive motor oil, your bike will smoke. It should be pre-mixed with your gasoline. I am relatively sure the ratio is 32:1, but you should check your owners manual to be sure. At this ratio you would use 4 ounces of oil to each gallon of gas. This ratio allows for an all-around use of your bike. If you are not going to use the bike at high speeds for extended periods, you may want to consider a different fuel/gas ratio - 50:1.

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What is causing the fouling? Engine oil? On a two cycle dirt bike, the fouling can be caused by excessive oil in fuel mix. I believe 50 to 1 is the correct ratio yet you may want to cut back, a little at a time, on the oil or run hotter fuel. The exhaust system will also accumulate enough oil sludge to impede the exhaust flow causing poor performance and plug fouling. A two cycle must breath freely to keep itself internally clean. Air cleaner to exhaust. Proper fuel mix should have little , very little. Good Luckand hopefully this helps you.

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1 Answer

1997 yamah yz 125 lots of white smoke comeing out of pipe


How much was it smoking previously? Too much smoke (oil) is a whole lot better than not enough smoke (oil). If you are mixing the oil and gas then cut back on the mixture. Obviously it is out of balance. Put 1/2 gallon of raw gas in the tank to cut the mix. After a tank or so you should get the balance back.

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Please rate this solution. Thanks!

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2 Answers

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sounds like the bike is in need of new piston rings especially if that much oil is blowing on such a newer bike. if the crankcase is not overfilled, then focus on rings especially if the sparkplug is oily too.

Feb 03, 2009 | 2004 Suzuki RM 125

3 Answers

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Nov 20, 2008 | 2003 Suzuki RM 250

1 Answer

Spitting black


I have an 06 cr 250. I used to mix my fuel at 32:1 and it ran fine for a year or so as of late it's been fouling plugs every single ride. I've ridden 2-strokes all my life and know how to ride the powerband but lately its been spitting oil out of every seam in the exhaust. It used to maybe have a couple drops after a ride out the end of the pipe but now its leaking from the connection from the case, the pipe to muffler connection and a lot out the back of the muffler. i switched to 40:1 about a month ago and that's what is happening, i couldnt imagine what it'd be like if i left it at 32:1. I took the carb out and looked at my jet sizes, they are both a size smaller than stock. Any help? Also, the bike is so tempermental that I have to have all my gear on when i start the bike because I cant take my hand off the throttle for even a second or else the bike will foul the plug and die literally within 2 seconds. I know they arent meant to idle but its kinda extreme. my friend has a 2005 cr 250 and mixes 32:1 has no problem, can start his bike on the stand and walk away from it for 5 mins and put his gear on.it'd idle for at least 10 min before it'd die, but he'll kick it and it'd start right back up. I've heard running bean oil would help, but I've also heard it has a tendancy to seize up the rings? any truth in that? ,I would try more gas in your mixture, before you start changing everything. Its all in the way your ride, some people can do 32:1, some 40:1(me), some 50:1. ,,,

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