Motul 800 over Redline Oil (Motul 800 is great)

[The Tortoise]

I have had some jetting problems with my 2001 300EXC. During the winter at 4000 feet and 35 degrees my jetting was great:
I needle at 2 position
42 pilot
170 main
#7 slide
(Using Redline oil at 44:1 The bike ran great, slightly rich after checking plug, and had oil dripping all over the bike after a ride)

When it heated up to 70 or more, I started to foul plugs every 40 miles. So I changed jetting to:
I needle at top position
42 pilot
168 main
#7 slide
Using Redline oil at 40:1 (lean bike another 10%) I kept fouling plugs. When going slow with kids every 25 miles.

What was wrong I asked. I asked Strick and bought all the different needles from Sudco. I liked the bike in winter so I thought it might be the pilot or needle since I don't race my engine much.

I decided to clean carb again. Did it alot for awhile, and it was full of black liquid stuff floating in bowl. Red stuff at air mixture screw (blocking air inlet). I think it was PJ1 air filter oil. So I dampened the filter real good with paper towels after cleaning and oiling with PJ1. I cleaned carb. And after reading all the posts on Motul 800, bought some. I pay just 8.70 a liter for the stuff through a club I'm in. I mixed at 40:1 and bike ran great. No oil leaking out of exhaust (well a very slight amount) after 38 miles. I haven't checked the plug yet (lazy and felt like writing in this froum). But bike ran great at 6,000 feet for 38 miles at 92 degrees.

Get Motul 800. Don't buy Redline

The "oily" Tortoise

 

[shaggy829]

tortoise
could it be that when you sopped up all the excess oil from your filter that your bike could suddenly breath again?
i will have to defend redline the tip of my silencer is about the same color brown as my plug .

 

[Bigbird]

Tortise, I have had some experience with Redline oil in my 2000 300 EXC. After some time using this oil, my mileage dropped significantly. In races that I could complete with less than one tank of fuel, I found myself running out on the last lap. I also leaned the jetting, checked the float level, and completely rebuilt the carburetor. It got worse. I did some checking in the various forums and found that other people had the same problem with the only solution being replacing the caburetor. Three people with whom I compete who are "A" Hare Scrambles riders also said they had to replace their carburetors. One guy on a 200 EXC replaced his carburetor twice. The common denominator in all these cases was the use of Redline Oil. I bought a new carburetor, and changed to a different oil. Immediately, my old jetting worked again, and I was getting over 70 miles on a tank of fuel.

I cannot specifically indict the Redline Oil. I can only suggest anecdotally that the oil seems to have caused the problem. Do a search on Redline oil. You will see that others have had the same problem.