Maintenance & Technical > KX500 Original
Spooge, Jetting, Mufflers, and Motul 800
Mohave:
Wanted to get some ideas on why my bike has these "Spots O Spooge" (SOS) on the fender, myself (don't ask), the muffler, and anywhere around the back end of the bike. 2002 with fresh OEM piston/rings, well jetted, plenty of power, starts first kick hot/cold, etc. One thing after riding with USMC500 I decided that I would cut off the tip off the FMF as I liked the look. I then decided I really didn't like being "tipless" (no offense Oscar) but did not like the stock FMF "droop" so had a straight tip put on. I don't think this is causing the "spots o spooge" but the exhaust is exiting straight out instead of down.
Jetting is 168/stock 3rd clip/55 and I have tried lots of different combos. Stock carb with stock reeds. I have run the ratio from 40:1 to 80:1. Less SOS at 80 but still there. I run 10oz of TORCO octane boost with 91 octane CA gas for 5 gallons. 40:1 feels fat, 80:1 feels best. I usually end up at 70:1. Been in the motor a few times while experimenting with the bike and getting used to the 500. No carbon, everything is nice and wet, looks great. Plug is always black, maybe a little wet, and never fouls. I always run my 500 a little rich here in the desert. Have 45 hours of engine time. Seems like it started 10-15 hours ago? Do I just weld a 45 deg on the tip and not worry about it or is something up? Is this normal? No change in the power at all, bike has always run very well.
Motorrad:
Oil your chain alot? Looks like chain flickins to me
Warning. On my phone. So pics are small
What oil ya running?
2-Stroke Tom:
--- Quote from: Mohave on May 27, 2013, 07:36:13 AM ---Wanted to get some ideas on why my bike has these "Spots O Spooge" (SOS) on the fender, myself (don't ask), the muffler, and anywhere around the back end of the bike. 2002 with fresh OEM piston/rings, well jetted, plenty of power, starts first kick hot/cold, etc. One thing after riding with USMC500 I decided that I would cut off the tip off the FMF as I liked the look. I then decided I really didn't like being "tipless" (no offense Oscar) but did not like the stock FMF "droop" so had a straight tip put on. I don't think this is causing the "spots o spooge" but the exhaust is exiting straight out instead of down.
Jetting is 168/stock 3rd clip/55 and I have tried lots of different combos. Stock carb with stock reeds. I have run the ratio from 40:1 to 80:1. Less SOS at 80 but still there. I run 10oz of TORCO octane boost with 91 octane CA gas for 5 gallons. 40:1 feels fat, 80:1 feels best. I usually end up at 70:1. Been in the motor a few times while experimenting with the bike and getting used to the 500. No carbon, everything is nice and wet, looks great. Plug is always black, maybe a little wet, and never fouls. I always run my 500 a little rich here in the desert. Have 45 hours of engine time. Seems like it started 10-15 hours ago? Do I just weld a 45 deg on the tip and not worry about it or is something up? Is this normal? No change in the power at all, bike has always run very well.
--- End quote ---
This is definitely an indication of running rich, even though you have set your jetting to "ballpark" specs. Chain fling wouldn't end up on the top of your fender so uniformly like it is in your picture. If you pull your plug at idle, your only getting an indication of your pilot/air screw adjustment jetting. To jet the rests of the circuits correctly, you need to throttle chop it and pull the plug at varying throttle positions to jet the needle and main. This is the correct way to find optimal jetting, but any significant change in elevation/temperature and you technically will have to make jetting adjustments.
In my opinion, leave it the way it is if it's running as well as you say it is. Run 40:1 (not 70:1!!), and wipe the SOS off after you ride. This is cheaper than rebuilding your motor due to a lean condition.
Motorrad:
And you have it backwards. 80:1 is RICHER. Than 40:1. The way the motor sees it
sandblaster:
Yep, anything that takes up the space flowing through your jets besides fuel makes a leaner mixture...
More oil flowing through the jets means less fuel is flowing through.
Less fuel entering the combustion chamber with the same volume of air makes a leaner mixture...
Here is some info from Motul in regards to their MX blend:
RECOMMENDATIONS
Mixing ratio : MOTO CROSS GRAND PRIX : 2% (50:1). In normal conditions decrease the percentage
by 0.5%.
Tune according to your own use.
Navigation
[0] Message Index
[#] Next page
Go to full version