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Old 03-07-2013, 04:47 AM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: Need advice on Oil mixture

Originally Posted by Russ McClay View Post
Hey there...

You'll get a lot of opinions about this subject which as been discussed many times. I'm a newbie with only 400 miles on my first build, but here's my experience:

I used a 16:1 mix (Castrol 2T) for the first couple of gallons of gas. I think that is actually a bit too much...but it was OK. Then I went to 32:1. Just checked the plug today and all is well. I could actually go for a tiny bit more oil. Like 34:1 according to the plug color.

Here's the best chart I've found, thanks to a post by Dave31:

Very important to check the plug. Don't take it out when the motor is hot.
Wait for the motor to be cool.

That plug chart is for four strokes.... I would say dial it back SEVERAL steps for two strokes, and don't worry so much about having a slightly "oil fouled" appearance, as these engine are two strokes.

You want a chocolate brown or slightly tan as your lightest color.

This one is actually much better and supplied by Dave31 as well.-

Last edited by Bikeguy Joe; 03-07-2013 at 04:51 AM.
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