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Old 06-19-2013, 07:21 PM   #1
Der Kaiser OP
Joined: Oct 2012
Oddometer: 13
2007 ktm 85sx

I bought this bike for my 15-year old daughter to learn to ride and we puttered around on it this weekend where she learned to start it up, get going from a dead stop in first and shift (just first to second and back down). Unfortunately, the bike smoked like an old stove burning wet wood at everything but low idle where it ran fine. Any idea what might be going on? I changed the plug at the beginning of the season and I don't think it has anymore than 3 hours on since. Thanks for any input in advance.


P.S. The bike has done this only on and off but I chalked it up to rich oil mix in the fuel. It wasn't doing it during the previous ride and I'm using the same jug of oil/gas mix as before.
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Old 06-20-2013, 02:38 AM   #2
Spelt with 2 ffs
nevgriff64's Avatar
Joined: Nov 2005
Location: Melbourne Australia
Oddometer: 14,683
Lets move this over to the 2 Stroke Forum for you.

Orange Crush is for the 950/990/1190 Twins.
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Old 06-22-2013, 07:54 AM   #3
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Joined: Sep 2009
Oddometer: 8,481
If she isn't running it really hard I'd lean out the oil in the mix a bit. When my kids were racing 50cc we could run 100:1 Amsoil at 100:1 till they got really good on 65 and 80cc bikes, then we moved to more oil, 64:1 with that 100:1 Amsoil worked pretty well. We now race our 125-380cc 2t bikes at 44:1 on cheapo walmart premix and they are just as happy. That is high RPMs, A and B racers.

With low RPMs and lugging around they can load up on oil, and not burn it as much as spooge it out. When it revs a bit it gets all that oil from the crank up top, there is your smoke (probably).

Don't be afraid to thin regular oils to 50 or even 60 or more :1 if she is basically lower RMPs with low loads. It'll eventually foul the plug if the engine isn't getting hot and fast enough to burn or expel the oil.

Keep an eye on the gear oil level too, in case it has a bad crank seal but then it would be over rich on oil all the time.

Of course, you can join in the nutty premix oil thread too!
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