Also to much oil and it can get trapped between the rings and over heat and burst the rings.This post and my other post are my 2 cents.
Also to much oil and it can get trapped between the rings and over heat and burst the rings.This post and my other post are my 2 cents.
250r rules
Last edited by fabiodriven; 06-06-2018 at 01:16 PM.
85 Tri-Zinger 60
85 ATC250SX
86 ATC250SX
87 ATC250SX
02 XR650L conversion
84 ATC 480R
That's a generic non-answer. I hate when ppl say stuff like "because I said so"...tell him to cough up the facts. "Because I dyno stuff and you don't" doesn't mean he knows what he's talking about. Someone with real knowledge will explain why and unless he asked you what engine size/type , Make and model, fuel octane, style of riding, etc then he's probably already wrong with that generic answer.
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Last edited by ironchop; 06-06-2018 at 03:45 PM.
Well ain't I the idiot?
I rode with 2 guys back in the day that had 2 strokes and one only used 30W in his 250R and I have no idea what the other used in his Quadzilla. I never questioned any of it because all I ever had was a 4 stroke.
Since the only 2 strokes I've ever owned are a chainsaw and a weedeater, I will just hang-up and listen on this thread. I will admit when I have a brainfart.
Yup more oil equals less gas. Less gas equals lean conditions. Lean conditions equals more heat.
The volume of fuel/oil moving thru your jets is constant at any given throttle opening unless you rejet but when you put more oil in the exact same volume, you end up with less gas in the same volume
That's why when you change premix ratios, you sometimes need to rejet
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Yeah I've heard of ppl using 30W car oil back then as well but a service tech at our local yammy dealership when I was a teen told me not to because motor oil has particulates in it when it burns that gets leftover to help scratch and wear out rings and stuff. I've seen four strokes that burnt alot of oil looking like someone threw oily sand inside the cylinder and my valve stems were scratched too as well as the cylinder walls and piston. This has been the case more than once when I cracked open an unknown motor that burnt alot of oil. I'm not certain if that's what the case was but it was the one common denominator. No metal shavings in the oil but lots of oily carbon chunks everywhere in the cylinder
I'm not sure if he was full of crap or he just wanted me to buy more expensive Spectro from him but I bought the oil that was designed to burn instead (Spectro)
Maybe it's because Brendon is younger than us and so he only knows about the period after The Awakening, when we quit being cheap and lazy...that's why Arky's reply sounded like absolute gibberish to him. With today's premix oil tech, it is frowned upon to use car motor oil since we moved away from that thanks to education and better products. I'm sure no offense to Arky. Perhaps if he said 'WTF?!?!' instead
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My dad always used 10w30 or 10w40 in his chainsaws both in the gas and for the bar.
250r rules
Great discussion so far in this thread. Thanks for the feedback and keep it coming.
Look for a Fuel distributor in your area...Home fuel Oil, Truck and Race fueling business. No corner gas station it's going to take some looking around. Next time you see a car show, stop in and ask some vintage car guys...bet there is a spot not far out of the way.
Take it for what it is: My motor builder Minton Cycles and I talked about this subject over my sons 16'CX65 which had a full respring/National Race Prep done on it. He said Cobra actually tested non eth to pump gas and fresh eth pump gas makes better compression in their machine with a full synthetic BelRay blend.
Last edited by Tri-Z 250; 06-07-2018 at 01:26 PM.
My .02
This is IMO one of the better oil ratio excerpts written.
http://www.klemmvintage.com/oils.htm
If you want the cliff notes, oil ratio is a function of RPM. High, sustained revs require a larger ratio of oil to gas (20-25:1) whereas inconsistent RPMs or on average, lower RPM engines can get away with less oil to gas ratio (30-40:1).
IMO, Honda was playing it safe thinking that your everyday joe may/could be revving it to the moon during the life of the motor and they wanted to ensure the crank bearings stayed happy. This is a good thought but at 20:1 and as Fabio said earlier you are loosing a cooling effect because by its very nature gas is a coolant for your motor, moreso the higher in octane you go. So remember, more oil means less molecules of gas which equals less cooling for your motor. It’s all a delicate balance but goes right back to RPM.
If you are a sand duner or road racer, better start investing in (insert your favorite oil company here). If you are the weekend warrior on trails or just like to play around then 30-40:1 may be more your speed.
I cut the difference and run Klotz beanol at 36:1