Maintenance & Technical > KX500 Original
What premix ratio do you run?
KXcam22:
A Case Study: Last night I opened up a 2001 YZ125 that ran 40:1 chevron TCW3 (yes Chevron) oil - previously owned by a Yamaha shop mechanic (oil recommended by him too). 125 PSI compression. The top end had been in there for 3 years casual riding. I noticed 2 things right away. First it looked much better than I expected and I was surprised at NO carbon. The head cleaned up perfect by wiping with a cloth and no unexpected cylinder wear. What I did find was that the piston (and the extra worn ones that came with the bike) all had small exhaust port bridge (there are oil holes too) seizures. Not significant...but there! In addition, my belray run motors always have a nice comforting coating over everything and oil pooled in the collector ducts for the main bearings. This motor had nothing. In conclusion, the Chevron oil, while not something I would choose run in anything, performed much better than expected. It has published ratios of up to 100:1 (my yamaha outboard runs that) and I suspect it might be made by Torco. Still I did not see enough things I liked. I will be sticking to synthetic, Belray MC-1 being my poison of Choice. Cam.
stewart:
i ran belray mc 1 at 40 to 1 in 5 or 6 diffrent bikes from 1983 to about 1991 and rode them very hard with no problems so i think it was a good ratio of mix and a good product in belray so when they came out with there h1r i made the upgrade and have had no problems
Friar-Tuck:
40:1
I usually ride sweep, and don't get out of 3rd very often, so the bike isn't run very hard at all. Ran Maxima 927 for about 3yrs with no problems, and am using up 3 gal. of Blue Marble I received when a guy at work sold his Bass Boat.
I'm interested in the Royal Purple and wondering if any of the Guys with Snow Machines
have run Polaris VES Gold.
Here's an old article by Gordon Jennings, on Pre-Mix Ratio's
http://www.bridgestonemotorcycle.com/documents/oilpremix6.pdf
Tuck\o/
KXcam22:
Tuck,
Where did you find that cool article? I have huge respect for Gordon Jennings. Interresting article, but written in 1978 before the mainstream of synthetics. They may be right - and a great topic for dicussion! I base what I do on past experiences. I am the mechanic I am because of all the engines I have seized and exploded (that doesn't sound very good). I raced my 1978 Husky 390 for its race season using 32:1 penzoil (mineral). Numerous piston seizures and couple of blown rods was quite common over a long race season. In 1979 I got a new 400 maico and this cool Belray MC-1 sythetic oil that recommended 85:1 on the bottle. That season I got 52 pro races out of that engine, no seizures no blown rods, nada. On rebuild it was worn, but carbon free, intact and running. I was hooked and have been a devout Belray fan ever since. I would love to see that test applied to a modern engine and comparing castor to mineral to synthetic at say 20:1 40:1 60:1 and 100:1 to see what results they get. Cam.
Friar-Tuck:
Cam,
I have found several other Jennings articles and will P.M. to you as I can.
Work has been a bit much lately and will try to get them out soon.
Unfortunately most of these types of write-ups are dated.
The latest and greatest seem to be all "White Papers" avail from researchers and the cheapest ones I could find are about $170.00.
Tuck\o/
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version