General > In General...
oil check
Foxx4Beaver:
--- Quote from: TJXK on November 30, 2013, 06:31:03 PM ---Certain conditions might require a richer mix, such as sand. The motor has to work much harder so it needs more oil. This is what I've been told, so maybe someone else with more experience could chime in.
--- End quote ---
that's incorrect....more oil will make it leaner.
think about it for a second....the more oil you put in gas...the thicker the gas becomes...thicker gas is going to have a harder time passing through the jets...which in return, leans it out.
Oil also burns hotter than gas, so your motor will run hotter when you run a heavier mix....definitely not the set-up you want for deep sand where the motor will be working hard.
KevinTwoStk and Dutchie have the right idea....go fatter jets/jetting.
You should never change mix ratios without changing your jets/jetting to compensate for the different fuel viscosity...pick a ratio and stick with it. I am running 50:1 in both my 250 and 500...but I also had to re-jet both bikes to that ratio.
sandblaster:
How often do I change the crankcase oil?
Frequently.
Regardless of what lubrication you use, the more often you change it, the better.
Gears and clutch plated wear as you ride releasing particles.
These particles rumble around your crankcase acting like liquid sand paper taking out bearings, seals, and clutch plates.
Premix.... You could write a book on that...So I settled for a short story :-D
http://www.oem-cycle.com/forum/viewtopic.php?f=5&t=109
I use Motul 800 at 50:1 in the desert, dunes, dirt, and street.
Jetting is everything... What works good on a warm sunny day at higher altitudes and high humidity would frag your motor at the coast regardless of the temperature and humidity.
TJXK:
--- Quote from: Foxx4Beaver on November 30, 2013, 09:47:52 PM ---
--- Quote from: TJXK on November 30, 2013, 06:31:03 PM ---Certain conditions might require a richer mix, such as sand. The motor has to work much harder so it needs more oil. This is what I've been told, so maybe someone else with more experience could chime in.
--- End quote ---
that's incorrect....more oil will make it leaner.
KevinTwoStk and Dutchie have the right idea....go fatter jets/jetting.
--- End quote ---
I see. I must have remembered it wrong. Good to know though. I didn't realize it would lean out the jetting by adding more premix. That definitely makes sense.
Foxx4Beaver:
--- Quote from: TJXK on December 02, 2013, 06:24:56 PM ---
--- Quote from: Foxx4Beaver on November 30, 2013, 09:47:52 PM ---
--- Quote from: TJXK on November 30, 2013, 06:31:03 PM ---Certain conditions might require a richer mix, such as sand. The motor has to work much harder so it needs more oil. This is what I've been told, so maybe someone else with more experience could chime in.
--- End quote ---
that's incorrect....more oil will make it leaner.
KevinTwoStk and Dutchie have the right idea....go fatter jets/jetting.
--- End quote ---
I see. I must have remembered it wrong. Good to know though. I didn't realize it would lean out the jetting by adding more premix. That definitely makes sense.
--- End quote ---
I read about it over 30 years ago in an article Rick Sieman wrote in one of the Dirt Bike magazine issues...and like you, before reading that article I thought adding more oil would make it richer...back then I had a new 83 CR125 which took pre-mix at 20:1.
About 20 years ago, my buddy and I started talking about it one day, comparing each others opinions...then he decided to try a quick experiment.
He got two identical plastic cups, drilled a 1/16th" hole in the bottom of each one, then put an identical amount of fuel in each one....one had a 32:1 mix, and the other was straight gas.
The one with straight gas drained a few seconds faster every time.
There's a TON of info on the web about this controversial subject...even on this site...but you can do simple experiments right in the comfort of your own garage that don't lie.
staffylad:
thanks some good replys ther ,ive been running 150ml of putoline to 5 litres of gas but I want to tune my carb and set the jets and idol correctly ,it rains here mostly so its in the shed lol but when it finaly drys I will be on track so itl prob wettish mud surface so that means a lot of water density ...
cool :)
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