Posts
403
Joined
5/21/2017
Location
Shelby, NC
US
Edited Date/Time
2/20/2019 9:58pm
So I recently did a top end a found a lot of in burnt oil inside of cylinder. So I figured it was transmission fluid. So I replaced the crank seal. My spark plug wasn’t crazy bad but it may have been a little dark. No signs of bad jetting. Runs great. Well my buddy took a video of me at my race and off the start I noticed it smoked like crazy. Could it be I just need to put a fresh spark plug in? Can jetting be to rich but not cause any symptoms? Was the bike just loaded up a little cause I didn’t clear it out before cutting off? (Hare scramble racing starts from a dead engine). What do y’all think?
You'll need to rejet for the new oil ratio.
Looks like it was loaded up off the start. Are you losing trans oil?
The Shop
128oz/gal
32:1 = 128oz : 4oz
40:1 = 128oz : 3.2oz
A difference of 0.8oz per gallon of fuel.
0.8oz = 23.66ml aka less than half of a shot glass of oil per gallon
There are 3785ml per gallon (roughly)
In other words, a correctly jetted bike will do fine on 32:1 in the woods. It will not be "literally loading it up".
Oils with a lower flash point are recommended for woods riding for this very problem...Anything with castor oils will carbon up woods bikes much wuicker.
Your oil mixture ratio probably isn't the culprit here, so much as the engine temp. (Yamalube R is a little smoky sometimes, too.) As long as your bike is running right, I bet it's a warmup issue and not an engine problem.
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