I have to agree with Marcus. My sons Honda 125 was extremely clean inside,untill I started leaning the jetting out,it looks much more normal now!Originally posted by marcusgunby
Ive read a rich engine will wash the top of the piston-so its not really a oil thing at all.When its leaned out it will run hotter and may have a bit of carbon build up.
I'm still a little unsure about the "one size fits all" Wiseco compared to the sized OEM pistons.
Originally posted by bigred455
R cannon run a different oil with the same jetting and ratio or the oils company recommendation and you will see I am correct.
There is nothing magical about Yamalube R, other than it being a very good general purpose oil.
I will continue to use it out of fear.
....Originally posted by Rich Rohrich
I've run lots of different oils and ratios including Yamalube R in roadrace and drag bikes for a lot of years. Deposit severity always comes back to piston crown temperatures, the jetting (how much carbon remains after the fuel reaction), combustion temps(again related to jetting) , and the amount junk in the fuel (this can play a larger role than many realize).
There is nothing magical about Yamalube R, other than it being a very good general purpose oil. :silly:
If an engine is jetted sharp and it is run hard Yamalube R leaves a nice thin brownish layer of carbon on the piston when it's mixed with clean race fuel at ratios from 16:1 all the way up to 40:1. The color and the overall look of the deposits will change some when you change over to unleaded race fuel, but the carbon layer is otherwise pretty similar.
Originally posted by bigred455
....
Not true yamalube 2-r will not leave a burn pattern on the piston crown like other oils.
.......Originally posted by Rich Rohrich
If you don't see a burn pattern with Yamalube 2R then the chamber is too cold, PERIOD. The look will change with different fuels, but it will be there regardless, IF the engine is run hot enough. A properly jetted MX bike that is being ridden hard should always show a pattern with this oil. If you don't see a pattern then you know there is free power just waiting to be unleashed from the engine.
The oil/fuel mix doesn't know or care what engine it's reacting in , the chemistry is the same regardless of the color of the bike.
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